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

Please enable Javascript
Model 411

Model 411 thread and low contrast for trans-rectal and trans-urethral transducers


Description and specifications:


The phantom is 12 cm wide, 4 cm high and 11 cm deep.


The scanning surface is covered with a protective plate of 0,5 mm PP that allows transmission of Ultrasound. 


The phantom contains:


10 twisted threads for 30-40 dB axial and lateral resolution. The position of each individual thread is correct within +/- 0,4 mm.


3 groups of 11 twisted threads for 6 dB axial and lateral resolution.


3 groups of low contrast cylinders, that deviates +6 dB, +3 dB and -6 dB from the background. The first group is 5 mm in diameter and is centred 2 cm below the surface. The 2 next groups are 10 mm in diameter and are centred 6 cm and 10 cm below the surface.


Attenuation of background material: 0,5 dB * cm * MHz. Tolerance see data sheet.


Sound speed of background material 1540 m/sec. Tolerance see data sheet.


All threads consists of 2 nylon filaments twisted >1 times per mm.


Outer dimensions: 18,5 cm  * 18,5 cm * 7 cm


Weight: 1,2 kg




20 dB beam width:


  1. Optimise the focus of the scanner in the region of test.

  2. Reduce the amplification, so that the threads just can be seen.

  3. Increase the amplification 20 dB.

  4. Measure the dimensions of one wire axial and lateral.

  5. Repeat step 1 to 4 at relevant depths.


6 dB beam width:


  1. Optimise the focus of the scanner in the region of test.

  2. Adjust the amplification, so that the wires are medium grey.

  3. Notice how many of the wires in the 6 dB group that can be seen.

  4. Repeat step 1 to 3 at relevant depths.




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