Model 411, thread and low contrast phantom









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Model 411 is equal to uppermost part of model 412, but turned 90 degree and with a scanning well with a vertical scansurface. See also model 410 and 1412A.

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

Instructions:

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.