Cirs Beam Profile & Slice Thickness Phantom ATS 538NH Скачать руководство пользователя страница 4 | Manualshive

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OVERVIEW

The Model 538NH can measure
the beam profile and slice thickness
of ultrasound imaging systems by
evaluating the appearance of a thin
plane of echogenic material against
an anechoic background.

Scanning the scattering plane from
one surface, perpendicular to the
thin plane, obtains an image of the
beam profile at varying depths of the
538NH. This image contains a great
deal of information about the sound
beam as it propagates through the
tissue-mimicking media such as the focal length, focal zone, beam width, side and
grating lobes, and far-field beam divergence. In addition, the near field region of the
beam can be easily distinguished from the far field as varying degrees of brightness
close to the scan surface versus the homogeneous amplitude further down.

Scanning the scattering plane from a second surface, 45 degrees from the scat-
tering plane, allows users to evaluate the slice thickness of an imaging system at
varying depths. Slice thickness or elevational resolution, the third component of
spatial resolution, displays reflections produced by structures in front of or behind
the beam’s main axis. The effect of changes in the slice thickness is identical to
those seen with axial and lateral resolution. The thinner the slice thickness, the
better the resolution: as the slice thickness increases, the degree of spatial resolu-
tion decreases. All ATS urethane phantoms are guaranteed for the useful life of the
phantom, defined as 10 years.

Key Tests with Model

ATS 538NH

• Tissue Harmonic Imaging

Compatibility

• Beam Profile/ Focal Zone/

Lateral Response Width

For more information on these tests, see
"Testing Procedures" starting on page 4

INSTRUCTIONS FOR USE

HANDLING AND CARE

For best results the phantom should be kept clean at all times. In particular a build-
up of dried coupling gel on the scan surface should be avoided. The phantom may
be cleaned with warm water using a lint free cloth. Particularly stubborn stains and
dirt may be removed with a mild household cleaner. The use of petroleum solvents
should be avoided since they may adversely react with the rubber-based material.

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Содержание Beam Profile & Slice Thickness Phantom ATS 538NH

Страница 1: ...USER GUIDE U LTR A S O UND Q U ALITY ASSURANC E Beam Profile Slice Thickness Phantom Model ATS 538NH 900 Asbury Ave Norfolk Virginia 23513 USA Tel 757 855 2765 WWW CIRSINC COM ...

Страница 2: ...2 ...

Страница 3: ...IONS FOR USE 1 HANDLING AND CARE 1 GENERAL GUIDELINES FOR PERFORMING MEASUREMENTS 2 ESTABLISHING A BASELINE 3 3 TESTING PROCEDURES 4 BEAM PROFILE FOCAL ZONE LATERAL RESPONSE WIDTH 4 ELEVATIONAL RESOLUTION 6 4 SPECIFICATIONS 1 0 5 WARRANTY 1 1 ...

Страница 4: ...lice thickness or elevational resolution the third component of spatial resolution displays reflections produced by structures in front of or behind the beam s main axis The effect of changes in the slice thickness is identical to those seen with axial and lateral resolution The thinner the slice thickness the better the resolution as the slice thickness increases the degree of spatial resolu tion...

Страница 5: ...s the speed of sound and ultimately the perceived measurements The phantom should be stored at room temperature for at least 24 hours before use to ensure its core temperature is correct Most diagnostic imaging systems and tissue mimicking phantoms are calibrated at room temperature commonly referred to as 23 C To ensure measurement accuracy a thermometer strip is afﬁxed to the outside surface of ...

Страница 6: ...is each facility s responsibility to establish the magnitude of drift allowed before corrective action is warranted 3 Allowable deviation from baseline measurements The difference between the original baseline measurements and subsequent measurement should be calculated and recorded At some point the difference will be large enough that some action is required call service replace system etc Each ...

Страница 7: ...sus the almost homogeniticity of the amplitude in the far field The beam profile is affected by the performance of the transducer and the pulser receiver section of the imaging system 1 Place the phantom on a clean flat surface with 1 scanning surface positioned for use 2 Apply a liberal amount of acoustic coupling gel to the scanning surface It is suggested when evaluating array systems a low vis...

Страница 8: ... the individual transducer the frame rate must be decreased until the individual beam profile is displayed Depending upon the system it may be necessary to reduce the frame rate to zero 5 Freeze the image and obtain a hard copy 6 Examine the display The image should be hour glass in shape Note the presence or absence of any grating lobes which will be displayed as two horns on either side of the m...

Страница 9: ...erface which is perpendicular to the axis of the sound beam creating a two dimensional image The image resolution is depedent upon the degree of axial and lateral resolu tion of the diagnostic system Elevational resolution displays reﬂections produced by structures in front of or behind the beam s main axis The effect of changes in the slice thickness measurements are identical to those seen with ...

Страница 10: ...ize a snowplowing affect on the surface of the phantom However transducer faces with a high degree of curvature the use of a high viscosity gel is recommended to maintain good coupling 3 Adjust the instrument settings TGC output etc to establish baseline values for normal liver scanning If the penetration is such that the bottom of the phantom is seen the gain settings should be reduced such that ...

Страница 11: ...he frame rate must be decreased permitting a single slice thickness to be displayed De pending upon the system it may be necessary to reduce the frame rate to zero 6 Freeze image 7 Using the electronic calipers measure the distance from the scan surface to the center of the displayed slice thickness image 8 Again using the electronic calipers measure the thickness of the image This is the slice th...

Страница 12: ...e slice thickness and depth at which it occurred this area is the focal zone NOTE A correction factor of 0 94 adjusts for the speed of sound in ATS urethane 1450 m s Results The slice thickness of the beam should remain consistent from week to week when using the same instrument settings transducer and the Model 538NH phantom Compare the test results obtained with a baseline or previous test If th...

Страница 13: ...7 0 cm 12 0 x 7 0 cm 22 0 x 7 0 cm 19 0 x 7 0 cm URETHANEPROPERTIES Freezing point 40 C Melting point Above 100 C Speed of Sound 1450 m s at 23 Attenuation Coefficient 0 5 dB cm MHz measured at 3 5 MHz TARGETS Scattering plane oriented at 45 to the scan planes used to measure slice thickness and 90 to the beam profile scan plane Size 26 x 7 cm Depth 0 to 22 cm ...

Страница 14: ...to returning the product Visit https www cirsinc com distributors to find your local distributor If you purchased your product direct through CIRS call Customer Service at 800 617 1177 email rma cirsinc com or fax an RMA request form to 757 857 0523 CIRS staff will attempt to remedy the issue via phone or email as soon as possible If unable to correct the problem a return material autho rization R...

Страница 15: ...12 ...

Страница 16: ...puterized Imaging Reference Systems Inc has been certified by UL DQS Inc to ISO 13485 2016 Certificate Registration No 10000905 MP2016 COMPUTERIZED IMAGING REFERENCE SYSTEMS INC 900 Asbury Ave Norfolk Virginia 23513 USA TOLL FREE 800 617 1177 TEL 757 855 2765 FAX 757 857 0523 EMAIL admin cirsinc com www cirsinc com Technical Assistance 1 800 617 1177 ...

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