MORGATE BiomédicalMORGATE Biomédical - Testeurs biomedicaux > Fantômes d'Echographie en Mode B
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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