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Model 83

Model 83, geometry phantom

Theory:

Especially in obstetrical scanning, it is essential to have a correct geometry of the entire depicting system - including the documentation unit. Even a divergence of just a few millimeters is of significance.

Description:

The phantom consists of 107 threads arranged in rows turned 45 degrees and 90 degrees to one another. The position of each thread is correct within +/- 0,15 mm.

The attenuation and sound speed are tissue equivalent.

All threads are 0,1 mm polyamid (nylon).

Specifications:

Dimensions: 28 * 18,5 * 9,5 cm

Weight: 3 kg

Background mass:

Attenuation: 0,5 +/- 0,1 dB/cm*MHz.

Sound speed: 1540 +/- 15 m/sec.

Density: 1040 +/- 20 kg/m3.

Distance between threads in each row: n * 10 mm +/- 2 * 0,15 mm.

Maintenance:

Once every month inspect the phantom.

The surface must always be covered with 1/2 - 1 cm preservative fluid.  Fluid that disappears by desiccation should be replaced by distilled water.

Once every 3 month replace the preservative fluid.

Please notice that the lid may not be 100 % tight. Drain fluid off before transportation, but never let it stay dry more than a few days.

The phantom will not stand frost. Safe storage temperature: 0 - 45 degrees Celsius.

 

Prescription for preservative fluid:

   906 ml Distilled Water

   94 ml Glycerol (85 %) or 65 g PEG MW400

   5 g  Acnibio OCS

   1 g Citric ascid