Model 453, the most sold Doppler phantom
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Model 453, the most sold Doppler phantom
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Specifications:
Dimensions: 40 * 14 * 28 cm.
Weight of phantom incl. Pump: 4 kg.
Tissue-equivalent Material:
Attenuation: 0,5 dB/cm*MHz tolerance see data sheet. Different Attenuation can be made.
Sound velocity:1490 m/s tolerance see data sheet. Sound velocity can be made different.
Vessels of C-flex:
1) curved tube. Inner diameter: 3,2 mm, 0,8 mm wall thickness
2) diagonal tube. Inner diameter: 8,0 mm, 1,6 mm wall thickness.
Stenosis 3,5 mm inner diameter
Maximum pressure of fluid: 50 cm Water
Pumping Unit:
Power consumption: 4 Watt AC, 230 Volt, 50 Hz.
Flow meter readout: 2 - 25 liters/hour. +/- 5% of max..
Mean velocity range: 1,1 cm/sec - 86 cm/sec
Reservoir: Holds 250 ml of artificial blood.
Recommended Use
The day before use, the bottle containing artificial blood is shaken well. Immediately before use, it is shaken carefully. Avoid air bubbles. An easy way to do it is to put a coated magnet into the bottle and place it upon a magnetic stirrer.
The artificial blood is diluted 10 times or more with distilled water.
Evacuating the Doppler fluid prior to use reduces problems with air bubbles.
Apply the Doppler fluid to the reservoir and start the pump. Let it run 15 minutes to eliminate bubbles. If air should be trapped in the phantom, tilt it slightly to release the air.
Use the preservative fluid of the phantom as coupling medium. If the transducer cannot tolerate fluid, use a rubber glove.
The phantom is made of agar and is therefore mechanically fragile. Avoid pressing the transducer into the phantom during scanning.
Perform Doppler and colour flow measurements at varying velocities and depths to performance check the following:
- Fast flow limit
- Slow flow limit
- Critical angle limit at a specific velocity, e.g. 50cm/sec
- Penetration at a specific velocity, e.g. 10cm/sec
- Effect of turbulence
- Effect of clutter (use the air bubbles)
- Position of Doppler signal in B-mode image
Use the reference table to find mean velocity in cm/sec. Due to the flow profile it will differ from the velocity readout on scanner.