GE Revolution CT, Руководство пользователя

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Table 1: Auto Gating Configuration Window
Number Name Description
1
Profile / Profile Namearea • Profile: Select a User Profile to define parameters for heart
rate and variability for the categories you want to set up.
• Profile Name: Rename the 20 editable User Profiles.
2
Average Heart Rate (BPM) /
Heart Rate Rhythm category
table
Create heart rate and variation categories.
3
Threshold area
Define
Variable Beat to Beat Threshold, Irregular Threshold and
Highly Irregular Threshold.
These thresholds define how Auto Gating will categorize the pa‐
tients HR (based on breath hold recording).
• Variable Beat to Beat Threshold: Max beat to beat variability
before the
HR Rhythm is classified as “Variable”.
• Irregular Threshold: Max number of irregular beats before
the
HR Rhythm is classified as “Irregular”.
• Highly Irregular Threshold: Max number of irregular beats
before the HR Rhythm is classified as “Highly Irregular”.
4
Scan Settings area
Define scan parameters for Cardiac scans.
See Cardiac Scan Parameters.
5 [Save] Saves parameter changes.
6 [Exit] Closes the window.
Scan Settings
The title bar of the
Scan Settings
area is updated with the exact boundaries selected in the
Average Heart Rate (BPM) / Heart Rate Rhythm
category table.
Table 2: Cardiac Axial Parameters
Name Description
Slowest Allowable Rotation Speed
Slowest gantry speed that would be suggested if prescribed Noise Index cannot be
achieved by SmartmA.
Acquisition Part 1
Acquisition Part 2
Acquisition Part 3
Defines the phases of the cardiac cycle that will be acquire during the scan, and the
relative mA (%) that will be applied for each part of the cardiac cycle.
Acquisition Parts can be defined in R-R % or ms offset from prior R-peak.
Widen for SSF
Enabling this feature directs the system to acquire data so a SSF image may be gen‐
erated at the specified cardiac phases or times.
For background information about R-wave, R-wave to R-wave, and % phase, see the
Cardiac Phase Background section.
HR Variation Type
HR Variation Amount
Inputs to calculate
HR Variation Amount in BPM.
HR Variation Type: Select Scale Factor or Absolute Value.
HR Variation Amount: Values are applied as scale factor if Scale Factor is selected
or as absolute values in BPM if
Absolute Valueis selected.
HR Variation Allowance defines the additional X-ray on interval that will be applied to
the scan to accommodate a possible discrepancy between the predicted heart rate
and the actual heart rate when the system is acquiring data.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
358 5 Auto Gating