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GeoScan User Manual  |  8100550-03 

•

 2018-10-26  |  

FOR SCIENTIFIC RESEARCH PURPOSES

 

13

 

About This Manual 

This manual provides information for installing and safely and effectively 
using the GeoScan sensor digitization system (handheld scanner and 
software). 

It assumes a working proficiency with EEG and computer 

systems.

  

Typographic conventions: 

•

 

Italics 

are used for definitions or newly introduced terms. 

•

 

Boldface italics 

are used for important concepts or special 

emphasis. 

•

 

Boldface 

is used for command paths (for example, 

File 

 Open

). 

Warnings, Cautions, and Notes 

The following are used to convey important information: 

 

WARNING:

 Warnings provide important information that, if 

unheeded, could result in serious physical injury, death, or 
equipment damage. 

 

 

CAUTION:

 Cautions provide important information that, if 

unheeded, could hinder the use of a product, feature, or procedure, 
or result in physical injury or equipment failure. 

Note: 

Notes provide clarifying information about a product, feature, or procedure. 

Summary of Contents for Geoscan

Page 1: ...GeoScan Sensor digitization system User manual For Scientific Research Purposes Electrical Geodesics Inc 500 E 4th Avenue Suite 200 Eugene OR 97401 USA www egi com ...

Page 2: ...ct special incidental or consequential damages resulting from any defect or inaccuracy in this manual even if advised of the possibility of such damage Sold and Distributed Exclusively by Electrical Geodesics Inc EGI 500 E 4th Avenue Suite 200 Eugene OR 97401 USA 1 541 687 7962 tel 1 541 687 7963 fax www egi com supportteam egi com orderdesk egi com GeoScan is not intended for use in diagnosis or ...

Page 3: ...GeoScan User Manual 8100550 03 2018 10 26 FOR SCIENTIFIC RESEARCH PURPOSES 3 GeoScan Sensor Digitization System Handheld Scanner and Software version 1 3 User Manual For Scientific Research Purposes ...

Page 4: ... Updated audible tones section Section 2 4 1 Added the Stability Trigger preferences Section 3 1 Added restart instruction after installation Section 3 2 Added download information for Java Section 5 3 1 Clarified scanner orientation Section 5 3 4 Updated Stability Trigger information Section 6 7 Updated probe instructions Section 6 8 Revised for clarity updated screenshots and updated probe instr...

Page 5: ...3 3 Interference Radio Frequency Emissions 21 1 3 4 Certifications and Classifications 22 1 3 5 Symbols 22 1 4 Safety Warnings 24 1 4 1 Personal Injury Risks 24 1 4 2 Equipment Damage Risks 25 2 GeoScan s Scanner and Software 26 2 1 Overview and Specifications 26 2 2 GeoScan Handheld Scanner 27 2 2 1 Buttons and Indicators 27 2 2 2 Indications of the Scanner s LED Stripe 28 2 2 3 Audible Tones 29 ...

Page 6: ...ardware 49 5 GeoScan Process 53 5 1 GSN Application 53 5 2 GeoScan Stages 54 5 3 Scanning Tips and Environment 55 5 3 1 How to Hold and Orient the Scanner 55 5 3 2 Scanning Environment 59 5 3 3 Scanning Tips 60 5 3 4 Probing Tips 65 6 Using GeoScan 67 6 1 When to Scan 67 6 2 For Best Results 67 6 3 Before Beginning 67 6 4 Launching the Software and Turning on the Scanner 68 6 5 STAGE 1 Selecting a...

Page 7: ...t using the GeoScan Batch Converter 94 6 12 optional Photograph Sensor Placement for Source Localization 97 6 13 Quitting or Storing the System 98 6 14 optional Capturing Images 99 7 GeoScanQuick Guide FOR PROFICIENT USERS 101 8 Maintenance and Cleaning 103 8 1 Maintenance 103 8 2 Cleaning Surfaces 103 8 2 1 GeoScan Handheld Scanner 104 Appendix A EMC Declarations 107 ...

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Page 9: ...s The GeoScan system steps you through the stages of its automated registration process Template Here you select a sensor template that matches the sensor layout of the GSN being worn by a subject The template predicts the locations of the sensors in that GSN while the remaining steps verify and or correct those predictions Scan Here you move the handheld scanner around a subject s head to record ...

Page 10: ...o improve the accuracy of source localization convert the 3D coordinate text files into file formats for continued work with Net Station BESA and MATLAB Convert Here you will use the GPS Solver software to convert the GeoScan 3D coordinate txt files into one of several formats for use in Net Station BESA MATLAB etc Photograph optional Lastly if you will be creating head models for use in EGI s Geo...

Page 11: ...t shipped with your system configuration Core components Scanner and Software GeoScan scanner FOR SCIENTIFIC RESEARCHPURPOSES 1 pkg EGI 4609761 GeoScan software FOR SCIENTIFIC RESEARCHPURPOSES Host USB converter Power supply Core components Misc Wireless optical probe 1 EGI 6300700 Optional components iMac computer monitor keyboard mouse 1 Apple current variant current variant Additional handheld ...

Page 12: ... Typical GeoScan System The GeoScan sensor digitization system handheld scanner and software digitizes the locations of up to 256 EEG sensors in a Geodesic Sensor Net GSN on a subject s head Figure P 1 Core components of a typical EEG only GES system including the GeoScan system ...

Page 13: ...erms Boldface italics are used for important concepts or special emphasis Boldfaceisused for command paths for example File Open Warnings Cautions and Notes The following are used to convey important information WARNING Warnings provide important information that if unheeded could result in serious physical injury death or equipment damage CAUTION Cautions provide important information that if unh...

Page 14: ...ical troubleshooting help advice implementation theory of features and functions theoretical background of dEEG sensor localization source localization etc The Products tab provides articles by product group The Manuals tab provides product manuals by product group The Video Tutorials tab provides product and instruction videos PERFORMANCE AND SUPPORT Tested All components of your EGI system have ...

Page 15: ...y to repeat and define the problem Document the problem Carefully record the sequential details of the problem Report the defined problem Contact EGI Table P 2 EGI contact information Philips Neuro Technical Support online www egi com knowledge center Email Technical Support supportteam egi com Email Sales orderdesk egi com Telephone 1 541 687 7962 Fax 1 541 687 7963 Address Electrical Geodesics I...

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Page 17: ... the system with non EGI approved components attached or poorly connected devices may result in hazards or unexpected performance due to additional loading or leakage or poor system timing and or poor data quality that may not be apparent For all safety and use conditions for using your EGI system refer to the manuals and instructions that shipped with your system MR Unsafe Never bring into the MR...

Page 18: ...ts GSNs are not recommended for use with non intact skin For scientific research purposes For indoor use only 1 2 Features Digitizes the location of up to 256 sensors on the scalp Scans sensors in 5 to 10 minutes Displays progress of sensor registration with a 3D sensor cloud and counter Detects fiducial points and alignment sensors using the provided probe Outputs 3D coordinate files of sensor lo...

Page 19: ...the GeoScan components Operating temperature 10 to 30 C 50 to 90 F Relative operating humidity 30 to 75 Atmospheric pressure 70 kPa to 106 kPa 1 3 1 Optical Radiation of Scanner Illuminators Eye safe The GeoScan illuminators emit invisible LED radiation These have been assessed against the standards listed in the Declaration of Conformity and found not to pose any potential hazard to eyes under an...

Page 20: ...a in which the GeoScan handheld scanner can optimally scan the sensors of a Geodesic Sensor Net GSN Ensure that the GSN being scanned is positioned within this area Figure 1 1 Scan volume of the GeoScan handheld scanner dimensions in millimeters mm 105 mm 4 in 276 mm 11 in 173 mm 7 in 840 mm 33 in 928 mm 37 in 883 mm 35 in ...

Page 21: ...ss B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that ...

Page 22: ...re Not suitable for use in the presence of a flammable anesthetic mixture with air oxygen or nitrous oxide Mode of operation Continuous when supplied by AC power source Method of sterilization or disinfection Not suitable for sterilization IRED illuminators risk group Exempt 1 3 5 Symbols The following symbols are used on EGI devices and in this manual Table 1 4 Symbols used on EGI devices and in ...

Page 23: ... Unsafe Data Imminent hazard Potential hazard Electrical hazard European conformity Manufacturer Read product documentation EGI and third party mfr Interference hazard Temperature limit 10 C to 30 C 50 F to 90 F Humidity limits Altitude limits Do not dispose with other waste comply with local regulations Serial number ...

Page 24: ...your subject can be entangled in them Maintain subject isolation within the subject environment The power supply must be located outside of the subject environment under all operating conditions Never simultaneously touch the subject and any component outside of the subject area and never let subjects touch any component other than the GSN that is being worn inside or outside of the subject area F...

Page 25: ...oved power adapter may result in an electric shock hazard and possible personal injury There are no user serviceable parts in the scanner All servicing must be done by NDI Unauthorized servicing may result in personal injury Avoid stacking or adjoining GeoScan equipment with other equipment Do not use the GeoScan System either adjacent to or stacked with other equipment Check that the GeoScan Syst...

Page 26: ...te after training 256 markers 5 10 minutes Table 2 2 Technical and performance specifications of the USB converter Dimensions 88 x 57 x 39 mm 3 46 x 2 24 x 1 54 in Weight 0 35 kg 0 77 lb Input voltage 24 VDC Output voltage 26 VDC Power consumption 2 W Table 2 3 Technical and performance specifications of the power supply Dimensions 125 x 62 x 32mm 4 92 x 2 44 x 1 26 in Weight 0 37 kg 0 82 lb Input...

Page 27: ...10 26 FOR SCIENTIFIC RESEARCH PURPOSES 27 2 2 GeoScan Handheld Scanner 2 2 1 Buttons and Indicators GeoScan s handheld scanner provides the following buttons and indicators Figure 2 1 Buttons and indicators of the GeoScan handheld scanner ...

Page 28: ...e 2 4 Indications of the GeoScan scanner s LED stripe Status Indication Scanner warming up pulsating white Scanner powered but software is not running white Scanner is ready solid blue Scanner scanning pulsating blue Scanner getting out of range of sensors pulsating orange Scanner completely out of range of sensors solid orange ...

Page 29: ...nsors When scanning sensors GeoScan will emit one bloop tone for each successful action of marking sensors whether it marked one or several Mute If desired you can mute or make louder this audible feedback using the volume keys on your computer s keyboard The onscreen 3D sensor cloud will confirm for you what sensors have and have not been scanned 2 2 4 Scanner Computer Cable Connections Use only ...

Page 30: ... GeoScan s system components 2 2 5 Scanning Apertures and Lenses For optimum performance protect the lenses of the GeoScan s scanning apertures from hard objects fingerprints dust etc For short storage periods rest the scanner safely on a table like it is a telephone handset For overnight or longer storage store the scanner in its provided protective case ...

Page 31: ...tware will deliver an error message from the scanner s internal bump sensor If you have any questions contact Philips Neuro Technical Support Table P 2 2 3 GeoScan System Requirements Mac OS X 10 13 Intel Core 2 Duo processor 2 GHz minimum 8 GB RAM minimum 2 4 GeoScan Software Interface 2 4 1 GeoScan Menus Standard menu options operate as expected GeoScan specific menus are described here Most of ...

Page 32: ... Support File Preferences With the Preferences dialog you can Enable disable the scanner s audible feedback tones See section 2 2 3 See the default directory for the resulting txt sensor scanning files and the png image capture files See the name and location of the rom probe file which is the basis for GeoScan s xml template files DO NOT change this file or its location The xml scanning template ...

Page 33: ...e the probed point will be created Edit Delete all Markers If for any reason you are dissatisfied with your markers you can use this feature to delete them all and restart the process starting with scanning See chapter 6 Edit Apply Labels During normal use the software leads you from the alignment stage directly to the labeling stage See section 6 9 Utilities Image Capture Optional digital still i...

Page 34: ...canner has resulted in a Bump Error necessitating that the scanner be returned to EGI for recalibration For details contact Philips Neuro Technical Support Table P 2 Utilities Track Tools The Track Tools window confirms various attributes of the GeoScan scanner Utilities Terminal Window The Terminal Window is a text terminal for accessing GeoScan s internal applications Utilities Console The Conso...

Page 35: ...You will then take that txt file into GPS Solver and convert it to one of several file formats xml sfp elp or nsi For details see the Geodesic Photogrammetry System GPS manual 8103002 Delete If you are dissatisfied with your markers you can use the onscreen Delete button to delete the entire 3D sensor cloud of markers and restart the process at the appropriate stage either selecting the appropriat...

Page 36: ...reen Align button allows you to probe the few alignment sensors that are used to align the resulting 3D sensor cloud with the sensor template See section 6 8 Probe stage 3 After you have scanned sensor locations the onscreen Probe button allows you to probe the fiducial points of skull landmarks See section 6 7 Clear If you are dissatisfied with your Manually Applied Labels or Probed points marker...

Page 37: ...ressing the scanner s scan trigger Clicking the Scan button Pressing and holding the scanner s scan trigger Regardless of method be aware that If you accidentally squeeze the scan trigger of the handheld scanner you might pause the scanning process unintentionally The onscreen display will confirm the current Scan Pause state Scan Pause state While scanning the onscreen Scan button becomes a Pause...

Page 38: ... Callout Pane Description Onscreen command buttons Lead you through the sensor localization process 1 Template 2 Scan 3 Probe 4 Align 5 Label 6 Export Additional commands Delete and Clear 3D sensor cloud and 2D sensor map 3D sensor cloud Provides feedback for the scanning probing and aligning of sensor locations 2D sensor map Provides feedback for the labeling of sensor locations ...

Page 39: ... probe first This prompt reminds users that they must complete the Probe stage before they can move on to the Align stage Scan counter and progress bar Shows how many of the total number of sensors in a GSN have been scanned The counter will show the number of sensors in a GSN plus one for example 129 instead of 128 because the REF Cz vertex sensor counts as one Note that the counter can also indi...

Page 40: ...White Scanned Markers Dot on sensor has been scanned and marked Yellow Visible Markers Dot on sensor is currently visible to the scanner but not yet scanned marked Red Stray Markers Dot on sensor is only predicted This marker may be either a duplicate marker or one sitting outside of the 3D sensor cloud 3D sensor cloud while labeling White Scanned Markers Dot on sensor has been scanned and marked ...

Page 41: ...uire you to return to scan mode to rescan that sensor 2 4 4 1 Mouse Controls for the 3D Sensor Cloud Table 2 7 Mouse controls for the 3D sensor cloud Action Mouse control Rotate Left click drag Pan Option click drag Zoom in out Right click drag 2 4 4 2 Mouse Controls for Markers Table 2 8 Mouse controls for markers Action Mouse control Result Select marker Left click on a marker Marker turns yello...

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Page 43: ...plications GeoScan If you later need to reinstall or upgrade the software contact Philips Neuro Technical Support Table P 2 If you purchased your GeoScan system without a computer contact Philips Neuro Technical Support Table P 2 andyou will be instructed how to download the software 3 1 Installing the GeoScan Software After you have downloaded the EGI GeoScan Installer you will use it to install ...

Page 44: ...have the appropriate version of Java you will be prompted to install it Go to section 3 2 to install Java then return here and continue with step 3 If you are not prompted to install an appropriate copy of Java continue with the next step 3 Enter your admin username and password and click OK 4 Follow the instructions provided by the installation wizard a Click Next ...

Page 45: ... icon checkbox to create a desktop GeoScan icon and click Next You can later drag the GeoScan icon to the Dock to keep it with your other frequently used application icons e Click Finish 5 The wizard will end with an installationcompleted screen When prompted allow NDI extensions in the Security panel of System Preferences Restart your computer after installation whether installing for the first t...

Page 46: ...sion of Java do the following To download and install Java you must be connected to the internet 1 Click More Info to download Java SE 6 After downloading browse to locate the JavaForOSX pkg file 2 Double click the JavaForOSX pkg file and follow all prompts a At Introduction click Continue b At Read Me click Continue c At License click Continue and Agree ...

Page 47: ...R SCIENTIFIC RESEARCH PURPOSES 47 d Accept the default destination and click Continue e Accept the standard installation type and click Install f Enter a username and password and click Install Software 3 When installation is complete click Close ...

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Page 49: ...URPOSES 49 4 Cabling the GeoScan Hardware Cable the components of the GeoScan system as follows 1 Plug the power data cable of the USB converter into the base of the GeoScan handheld scanner To properly seat the connector align the red marks on the plug and receptacle ...

Page 50: ...an User Manual 2 Connect the power and USB data cables to the corresponding ports of the USB converter 3 Clasp the top and bottom cable covers around the lip of the USB converter and secure them with the thumbscrew 4 Plug the USB data cable into the system computer ...

Page 51: ...let has an on off switch then switch ON the outlet so that the system is powered 8 Wait for the scanner to emit two beeps The beeps will indicate that the scanner has completed its diagnostic evaluation If you miss the beeps go to step 9 for the LED indications 9 After the diagnostic evaluation is complete the LEDs on the USB Converter will light up as follows Power LED Turns green to show the sys...

Page 52: ...stem computer and the scanner this LED turns orange If the Power LED does not turn green and or the Communications LED turns orange then 1 Check all cables to ensure they are properly seated 2 Confirm that the AC wall outlet is powered via its ON OFF or reset switch See step 7 3 If the scanner remains unready for scanning contact Philips Neuro Technical Support Table P 2 ...

Page 53: ...tinuously at the bottom of the window 5 1 GSN Application The quality of your EEG data and sensor localization requires with the proper application of the GSN For the step by step instructions for using your GSNs refer to the manuals and instructions that shipped with your GSNs A GSN is properly applied when It is positioned symmetrically on the head with a straight midline from the nasion sensor ...

Page 54: ...GSN being worn by the subject The template predicts the locations of the sensors in that GSN while the remaining steps verify and or correct those predictions Scan Move the handheld scanner around the subject s head to record the physical locations of EEG sensors Probe Probe the fiducial skull landmarks nasion left preauricular and right preauricular to confirm those locations for the software Ali...

Page 55: ...the subject s head Use the Image Capture feature for general purpose images only See section 6 14 For high resolution images use a high resolution camera 5 3 Scanning Tips and Environment 5 3 1 How to Hold and Orient the Scanner Scanner s orientation to the sensors and head The scanner s apertures must remain perpendicular to the surface of the sensors being scanned As such you will move the scann...

Page 56: ...tion in space return it to the last position it held its orientation and hold the scanner still for a few seconds until it reorients itself in space A loss of orientation is indicated by the LED stripe turning orange In lieu of the last position returning to the top center of the subject s head will reorient the scanner One or two hands Hold the scanner with one or two hands with the cable extendi...

Page 57: ...t the onscreen 3D sensor cloud also changes its orientation Direct aim Point the scanner directly toward the sensors that you want to scan and move the scanner parallel to the curvature of the head While scanning the scanner is looking for the dots in the center of each sensor s label in order to register the sensors A direct aim and parallel movement ensures that the scanning apertures clearly se...

Page 58: ...n it held its orientation or to the top center of the subject s head and hold the scanner still for a few seconds until it recaptures its signal with the software Then rescan the last path before orientation was lost to ensure that that area is completely scanned Positions subject technician and computer Arrange the subject yourself and the monitor so that you can see the monitor for feedback and ...

Page 59: ...ed by them is not within the wavelength range of 850 950 nanometers If unsure turn all unneeded light emitting devices off Minimize IR interference Minimize exposure to sources of IR interference such as sunlight ceiling lights and plasma monitors Even indirect sunlight coming in through a window can cause IR interference for the GeoScan scanner Therefore close window shades or use GeoScan in a ro...

Page 60: ...eed to be deleted Other blank spaces in the 3D sensor cloud indicate areas where one or more sensors that still need to be scanned Cable entanglement Do not wrap the scanner s cable around the subject or yourself You can avoid this by holding the cable with your right hand See section 5 3 1 Clear unobstructed view Before scanning ensure that the view of all sensor labels is unobstructed All sensor...

Page 61: ...to read sensor labels See Scanning distance If you see questionable marks around the 3D sensor cloud pull away the scanner so that it cannot read any sensors pause scanning and zoom out of the 3D sensor cloud as needed If you see any sensors floating in space away from the 3D sensor cloud those are ghost sensors You can also check the scanned sensor counter at the bottom of the window If the count...

Page 62: ...f Cz sensor 32 numbered sensor pedestals with electrodes 96 unnumbered sensor pedestals without electrodes Most but not all are necessary The software requires only about 95 of the sensors in a GSN to be scanned in order to process sensor locations However all fiducial points and alignment sensors must be included in that 95 for the software to process correctly Despite the 95 requirement scanned ...

Page 63: ...ll be numbered differently depending upon a GSN s channel count Initiate scanning You have the choice of three methods for initiating the scanning process Double press the scan trigger of the handheld scanner The scanner continues to scan until the trigger is again double pressed or the onscreen Scan button is clicked Click the onscreen Scan button The scanner continues to scan until the onscreen ...

Page 64: ...t Ready the scanning environment prior to the subject s arrival including mitigating any lighting or IR interference issues in the room to be used See section 5 3 2 Scanning path Before you scan plan a path around the GSN that will capture all sensors See section 5 3 1 Anticipate needing to make six to eight vertical swaths like the slices of an orange around the subject s head for 360 coverage Th...

Page 65: ...ional skill EGI recommends that you probe manually and leave the Stability Trigger disabled Using the manual Probe button with the Stability Trigger enabled can lead to creating false markers The Stability Trigger probing relies on holding the scanner motionless for a specific period on a fixed reflective point that it can lock onto Hold the probe in your dominant hand near the probe s tip without...

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Page 67: ...hting Control the lighting in the room per section 5 3 2 GSN application Apply the GSN properly per section 5 1 Scan uniformly Scan the sensors in a uniform manner per section 5 3 1 Probe carefully Probe the fiducial points and alignment sensors carefully per section 5 3 4 6 3 Before Beginning 1 Press to turn on the system computer but do not open the GeoScan software until section 6 4 2 Ensure th...

Page 68: ...canner 1 Select the GeoScan icon to launch the GeoScan software If the GeoScan icon is on the desktop you will double click it If the GeoScan icon is in the Dock you will single click it When the GeoScan handheld scanner is first plugged in or the computer turned on GeoScan will emit two beep tones after the scanner has completed its diagnostic evaluation 2 If a Temperature Out of Range message ap...

Page 69: ...re Out of Range message onscreen until the scanner has warmed up 3 If the onscreen command buttons are enabled the software is ready If the onscreen command buttons are disabled grayed out do the following to correct a disconnected or error state The system is not ready if The onscreen command buttons remain grayed out An error or searching for message appears at the bottom left of the screen alon...

Page 70: ...ot Ready Ready 6 5 STAGE 1 Selecting a Template Before you scan the first stage is to select a template that matches the channel count of the HydroCel or MicroCel GSN being worn by the subject GeoScan will open with the last template that was used You must select a template before you scan 1 Select a template as follows a If GeoScan opened with the correct template use that template and proceed to...

Page 71: ...an before you probe CAUTION To avoid personal injury hold the scanner s cable with your free hand to keep it from wrapping around the subject getting stepped on rolled over or entangled Scan as follows 1 Before scanning sensors plan a scanning path around the subject s head that adheres to all scanning tips in section 5 3 Scanning Tips Scanning path Start at the top of the head One swath is one ar...

Page 72: ...dates the current number of sensors that have been scanned Remember that GeoScan requires that you scan the stabilizer sensors those without electrodes in the 32 and 64 channel GSNs for a count up to 129 sensors 2 Hold the scanner with one or two hands and Start directly above the head and the vertex sensor REF Cz With both scanning apertures pointing toward the sensor tops being scanned With the ...

Page 73: ...d be aware that If you accidentally squeeze the scan trigger of the handheld scanner you might pause the scanning process unintentionally The onscreen display will confirm the current Scan Pause state 4 Establish the scanning distance between the scanner and the sensors on the subject s head a Start by holding the scanner at about 46 cm 18 in from the GSN b Then slowly and smoothly move it in clos...

Page 74: ... Stripe and Software Marker Feedback Color LED Stripe Gray scanner unpowered White scanner powered SOLID blue scanner in range pulsating blue scanner scanning pulsating orange scanner nearing out of range SOLID orange scanner out of range 3D Sensor Cloud Markers White scanned Yellow visible Red stray Auditory As you scan you will hear the scanner bloop for every successful scanning action whether ...

Page 75: ...n trigger click the onscreen Pause button or release the scan trigger 8 Review the 3D sensor cloud by using your mouse to rotate it see section 2 4 4 1 There should be no blank areas where there should be markers no stray markers no makers for the COM or S N pedestals nasion sensor between the eyebrows vertex sensor REF Cz at the top center of the head blank areas for the ear holes sensors above t...

Page 76: ...ping or lying outside of the 3D sensor cloud you will need to delete and rescan it before finishing the scanning stage Click a white marker to select it It will turn yellow You can select only one marker at a time Press the keyboard s delete key to delete the marker Delete all problematic markers if there is more than one Rescan those sensors 10 Pause scanning and review the 3D sensor cloud again ...

Page 77: ...ner Carefully probe the fiducial points as you will be touching the probe to the subject s skin Probe especially carefully around the eyes when probing the nasion sensor When probing fiducial points Be careful around the subject s eyes and skin Given the variation in head and face shapes the fiducial points may vary from subject to subject If helpful use two technicians one to handle the scanner a...

Page 78: ...t the probe touches the skin and not the top of a sensor Positioning and Holding the Probe Gently place the probe s tip on the subject s skin Place the probe in the center of the fiducial point Position the probe alongside the head and parallel with the surface of the point being probed Hold the probe in your dominant hand near the probe s tip without covering the probe s reflective disks bracing ...

Page 79: ...e Its apertures are pointed directly at the probe s reflective disks 6 Watch the monitor screen for the probe s tip to appear in the 3D sensor cloud and the probe volumes Note that the red line onscreen is not the probe but rather an arrow pointing toward the probe s tip Rotate left click drag Pan option click drag Zoom right click drag Probe Volumes Probe tip ...

Page 80: ...l automatically mark the point after the set time period 8 Immediately after the fiducial point is scanned pull the scanner away from the probe and GSN to avoid false markers 9 Notice that the software will automatically advance through the prompts for the fiducial points after each one is probed The scanner will emit an audible beep tone after the first two fiducial points but a squawk tone after...

Page 81: ...that you do not mislabel any points 13 After the last fiducial point is probed notice that The Register Subject dialog disappears The fiducial markers appear in the 3D sensor cloud as teal dots 14 Review the fiducial markers and ensure that each marker is correctly positioned correctly labeled If one or more fiducial markers are questionable then fix them as follows To fix any fiducial marker afte...

Page 82: ...ll three fiducial points are correctly marked continue with alignment in section 6 8 6 8 STAGE 4 Probing the Alignment Sensors Here you will probe four alignment sensors front left right and REF that will align the 3D sensor cloud with the sensor template Note that node refers to the top of a sensor You must align before you label Align as follows 1 Click the onscreen Align button ...

Page 83: ...t unlike the fiducial points the alignment sensors will be numbered differently for each GSN channel count 3 From the Alignment Probe Summary dialog click Probe 4 Follow the order of the prompts displayed by the Register Subject dialog 5 Hold the scanner away from the GSN and the probe until you have the probe in position RED question mark not yet probed GREEN check mark 4 already probed ...

Page 84: ... the probe in the center of the alignment sensor Position the probe alongside the head and parallel with the surface of the sensor being probed Hold the probe in your dominant hand near the probe s tip without covering the probe s reflective disks bracing the probe with a finger anchored on the subject s head and protecting the subject from the probe s tip 7 Draw the scanner in until It is within ...

Page 85: ...s Rotate left click drag Pan option click drag Zoom right click drag 9 When you have the probe in position press the scanner s Probe button The scanner will emit an audible beep tone You can also click Register Point on the Register Subject dialog If the Stability Trigger is enabled the scanner will automatically mark the sensor after the set time period Align Volumes Probe tip ...

Page 86: ...the fourth If you did not hear an audible beep tone but the scanner s LED stripe is blue the sensor may not have been scanned 12 Verify that the software marked the same point that you probed and that it did not skip a prompt 13 If the first second or third alignment sensor was incorrectly marked you have the opportunity to fix that one mark with the Register Subject dialog Click the dialog s Back...

Page 87: ...the labeling stage Continue with labeling in section 6 9 6 9 STAGE 5 Labeling and Review After you have scanned probed and aligned sensors the software automatically numbers that is labels the markers to match the numbers on the sensors in the GSN In stage 5 you will review the labels in the 3D sensor cloud with the help of a 2D sensor map against the GSN on the subject s head and make any changes...

Page 88: ...eting and or rescanning questionable markers You must label before you export Label as follows 1 Notice that the marked sensors are represented by both a 3D sensor cloud and a 2D sensor map 3D sensor cloud markers WHITE scanned and marked GRAY scanned but unlabeled FUCHSIA missed by scanner but predicted by template verify or rescan TEAL fiducial probed and marked ...

Page 89: ...e FUCHSIA and GRAY labels in the 3D sensor cloud GREEN markers successfully scanned RED markers unsuccessfully scanned Red markers may be predicted misscanned or mislabeled Enlarge view if needed Some RED sensors can appear as RED arrows so review all RED arrows Click drag to enlarge the window as much as is necessary to see all markers clearly ...

Page 90: ...al number S N sensor in the last row of sensors along the neck will be blank However other blank areas can be caused by hair or wires covering the reflective sensor labels 4 To correct markers or blank spaces in the 3D sensor cloud For blank spaces only proceed to substep For questionable markers click the marker to select it Press the keyboard s delete key to delete the marker Repeat substeps and...

Page 91: ...ter all sensors are correctly marked continue with section 6 10 but keep the GSN on the subject until after section 6 12 6 10 STAGE 6 Exporting 3D Coordinate Files Keep the GSN on the subject until after section 6 12 Here you will export the sensor locations as 3D coordinates in a txt file Note that the GeoScan software distinguishes pedestals that contain electrodes from stabilizer pedestals that...

Page 92: ... on the subject until after section 6 12 A GeoScan txt file cannot be taken directly into Net Station GeoSource or other application First it must be converted into a compatible format You will use the GPS Solver software to verify your GeoScan results and or convert your GeoScan txt files into one of several formats Table 6 1 Available GeoScan conversion file formats for compatible data formats A...

Page 93: ...does not allow you to convert batches of files 1 Locate and launch the GPS Solver application from either the Dock or Finder EGI GPS GPS Solver Depending upon how you purchased the GeoScan system GPS Solver will be loaded onto your GeoScan system computer or your EGI EEG acquisition computer 2 Click File Import GeoScan 3D coordinates txt file Open 3 Select the corresponding GSN ...

Page 94: ...int in the process your 3D model should have no issues If you are suspicious about your results start over and create a new 3D coordinates file Go to section 6 5 6 After the 3D model is verified export your file to the format needed Click File Export format 6 11 2 Convert using the GeoScan Batch Converter Keep the GSN on the subject until after section 6 12 ...

Page 95: ...not allow you to verify your GeoScan results before converting them 1 Locate and launch the GPS Solver application from either the Dock or Finder EGI GPS GPS Solver Depending upon how you purchased the GeoScan system GPS Solver will be loaded onto your GeoScan system computer or your EGI EEG acquisition computer 2 Click File GeoScan Batch Converter ...

Page 96: ... To use the GeoScan file batch converter Drop a file or folder containing files into the file drop pane For each file select the desired export file format For each file select the correct GSN Type Select whether or not to save the exported files to the input directory s or other directory s Select whether or not to overwrite the existing file s Click Export ...

Page 97: ...henever taking photographs you need the subject s written consent to be photographed Guidelines for photographing the GSN on a subject s head Use a high resolution camera Photograph the fiducial points alignment sensors and all sensors As much as possible photo graph points and sensors perpendicular at right angle to their flat surface Skewed points and sensors misrepresent their true positions En...

Page 98: ...converter from the base of the GeoScan handheld scanner 2 Quit the GeoScan software 3 Store the GeoScan handheld scanner and system components as follows If using again soon you can rest the scanner safely on a table like it is a telephone handset This will protect the scanning apertures from hard objects fingerprints and dust If not using again that day store it in its provided protective case ...

Page 99: ...apture feature for head modeling images Use a high resolution camera See section 6 12 Whenever taking photographs you need the subject s written consent to be photographed Capture digital still images as follows 1 Ensure proper environmental lighting See section 5 3 2 2 Position the scanner 30 cm 12 in from the subject 3 Point the scanner directly at the subject 4 Press the scanner s Image Capture...

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Page 101: ... is available for users who are proficient with all of the safety conditions use conditions and use instructions in this manual 1 Set up See section 6 3 2 Launch software See section 6 4 3 Select template See section 6 5 4 Scan all sensors See section 6 6 5 Review markers See section 6 6 If needed select delete and rescan any bad markers ...

Page 102: ...ign 3D sensor cloud to template Alignment sensors are different for each channel count of GSN See section 6 8 9 Review markers See section 6 8 If needed click Back to fix the previous alignment marker 10 Verify markers in label view See section 6 9 Verify the markers in the 3D sensor cloud against the 2D sensor map and the sensors on the subject s head If needed select delete rescan and reverify 1...

Page 103: ...safely pack and return the unit to EGI for evaluation 8 2 Cleaning Surfaces The surface of EGI devices like the GeoScan handheld scanner should be cleaned as needed according to your facility s protocols and according to the instructions in this section WARNING Before cleaning device surfaces Switch off power to the scanner before cleaning it Failure to do so may result in personal injury Do not i...

Page 104: ... may damage the finish and remove lettering 8 2 1 GeoScan Handheld Scanner To clean the GeoScan handheld scanner do the following 1 Remove power from the GeoScan handheld scanner Unplug the USB Converter s power data cable from the base of the GeoScan handheld scanner 2 Prevent any liquid from entering the GeoScan scanner 3 Do not use abrasive aerosol or solvent products 4 Clean the scanner s surf...

Page 105: ...se a soft brush to remove dust Camera lenses and monitor screens Gently use a lint free anti scratch lens cleaning cloth External surfaces other than lenses and screens Use a cloth dampened with mild soapy water or isopropyl alcohol taking care not to wet any electrical contacts 5 Dry immediately with a clean dry lint free cloth ...

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Page 107: ...Recommended separation distances between radio frequency RF communications equipment and the GeoScan system see Table A 4 Note Portable and mobile RF communications equipment can affect the GeoScan system WARNING The GeoScan System requires special precautions regarding EMC It must be installed and put into service in accordance with the EMC information Failure to do so may result in personal inju...

Page 108: ...liance Electromagnetic Environment Guidance RF emissions CISPR 11 Group 1 The GeoScan system uses RF energy only for its internal function Therefore its RF emissions are very low and are not likely to cause any interference in nearby electronic equipment RF emissions CISPR 11 Class B The GeoScan System is suitable for use in all establishments including domestic establishments and those directly c...

Page 109: ...al or hospital environment Surge IEC 61000 4 5 1 kV differential mode 2 kV common mode 1 kV differential mode 2 kV common mode Mains power quality should be that of a typical commercial or hospital environment Voltage dips short interruptions and voltage variations on power supply input lines IEC 61000 4 11 5 UT 95 dip in UT for 0 5 cycle 40 UT 60 dip in UT for 5 cycles 70 UT 30 dip in UT for 25 c...

Page 110: ... mobile RF communications equipment should be used no closer to any part of the GeoScan system including cables than the recommended separation distance calculated from the equation applicable to the frequency of the transmitter Recommended separation d 1 2 P d 1 2 P 80 MHz to 800 MHz d 2 3 P 800 MHz to 2 5 GHz where P is the maximum output power rating of the transmitter in watts W according to t...

Page 111: ...cast and TV broadcast cannot be predicted theoretically with accuracy To assess the electromagnetic environment due to fixed RF transmitters and electromagnetic site survey should be considered If the measured field strength in the location in which the GeoScan system is used exceeds the applicable RF compliance level above the GeoScan system should be observed to verify normal operation If abnorm...

Page 112: ...r of the communications equipment Rated Maximum Output Power of Transmitter in watts Separation Distance According to Frequency of Transmitter in meters 150 kHz to 80 MHz d 1 2 P 80 MHz to 800 MHz d 1 2 P 800 MHz to 2 5 GHz d 2 3 P 0 01 0 12 0 12 0 23 0 1 0 38 0 38 0 73 1 1 2 1 2 2 3 10 3 8 3 8 7 3 100 12 12 23 For transmitters rated at a maximum output power not listed above the recommended separ...

Page 113: ...will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the ...

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