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temperature once again. Leaving the phantom in your car overnight during a typical New England winter, while
the phantom will not be damaged, you will need to wait approximately 24 hours for it to reach room temperature.
Tissue Mimicking Materials
ATS offers a choice between our standard hydrogel-based (water) or rubber-based tissue-mimicking material. As
with most things in life, the choice between rubber-based or Hydrogel TM material is a trade off of benefits. We
have provided a listing of the features and benefits of both material.
No
Comment:
Line targets & target structures have been
physically moved to compensate for the difference
in the assumed average speed of sound of soft
tissue of 1540 mps and the speed of sound of the
phantom. As the attenuation increases so does
the speed of sound in the rubber. Attenuation of
0.5 dB/cm/MHz = 1450 mps (measured at 3.5
MHz and 23°C
Lifetime (estimated to be 10 years)
Consistency of the
measurements with time
Changes begin to occur as
desiccation progresses, this
depends on the climate,
storage conditions and the
care taken of the phantom.
No change throughout the usable life have been
noted to date.
Exposure to temperatures
above 49°C or below 0°C
Phantom will be will severely
damaged or destroyed
Allow the phantom time to reaches room
temperature before using
Accidental Dropping
causing cracks in the
housing
Damage is usually beyond
repair, requiring replacement
Baseline Values
The baseline represents the instrument’s peak performance. Ideally, the baseline values are established
immediately following the installation and acceptance of a new imaging system. If this is not possible, immediately
after preventive maintenance and servicing by a qualified service engineer.
Scan the Model 570 Multipurpose Endoscopic phantom, while adjusting the controls to produce the best possible
image. If the bottom of the phantom is visualized, adjust the depth of penetration until only the lower targets are
visualized without artifacts produced from the work surface. One should take care to avoid over emphasizing a
particular area of the image. Make the display monitor’s brightness and contrast settings and the room lighting
conditions reflect a clinical environment.
When an acceptable image has been obtained with a particular scanner-transducer pair, the system settings must
be accurately documented on the quality assurance record. The settings that should be included; dynamic range,
gray scale level, power level, gain level, and time gain compensation (TGC).
Remember, the accuracy or the baseline values obtained and recorded are extremely important. These values will
become the basis for all future performance testing. Some systems have the ability to save the baseline values.
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