MORGATE BiomédicalMORGATE Biomédical - Testeurs biomedicaux > Fantômes d'Echographie en Mode B
Model 412 combined thread and low contrast phantom +/- 3 dB and -6 dB and threads
Theory:
This phantom is especially designed for testing focusing at -20 to -30 dB level and -6 dB level. The threads for -20 to -30 dB testing are distributed over a large scanning area, making it fast and easy to test an array transducer. Low contrast objects of -6, -3 and dB are incorporated to facilitate testing of low contrast resolution.
Description:
The phantom contains a vertical row of 19 threads, one cm from one another starting one cm from the surface. In horizontal direction the threads are displaced 0,2 mm from one another, to avoid shadowing. There are three horizontal rows of 11 threads each also with one cm distance from one another. These rows are placed at 4 cm, 8 cm and 13 cm from the surface. There are four groups of threads for 6 dB focusing control at 2 cm, 5 cm, 9 cm and 14 cm from the surface. Each group consists of six threads with increasing distance from one another from one to five mm. The low contrast objects are cylinders with diameters of five and ten mm.
Specifications:
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Dimensions: 23 * 18,5 * 9,5 cm or 27 * 18,5 * 9,5 cm as option
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Weight: 3 kg (or 3,5 kg)
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Background mass:
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Attenuation: 0,5 dB*cm-1*MHz-1 +/- 0,07 dB*cm-1*MHz-1 from 3 MHz to 10 Mhz
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Sound speed 1540 m/sec +/-15 m/sec from 20 C to 25 C.
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Back scattering: liver equivalent
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Density: 1040 kg/m3 20 kg/m3.
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Low contrast objects: Attenuation, sound speed and density as background.
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Back scattering -6 dB, -3 dB and dB all +/-1,5 dB.
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All threads consist of two filaments each of 0,1 mm nylon that are twisted >1 turn/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