72 Chapter 8: Performance Testing
Additional Performance Tests
CPD
MMode Imaging
Tissue Harmonic Imaging
Test CPD Note: Use the RMI 425 Doppler Phantom or the RMI 1425A Doppler Phantom.
1 Connect any transducer and set up the system for CPD mode.
2Acquire the image.
3 Press and release the Color key for CPD mode. Select CPD from the on-screen menu. A
Region of Interest (ROI) box is displayed on top of the grayscale image. (Press the 2D key to
return to 2D imaging.)
Move CPD
Image
• Use the touchpad to move the CPD ROI. While you are moving the CPD ROI, you will see an
outline of the new position moving on the display. When you stop moving, the new position
will display the CPD ROI. (The size of the CPD ROI is fixed. There is no control to change it.)
Adjust CPD
Gain
Turn gain clockwise to increase the amount of CPD gain. (While in CPD imaging, near and far
affect only the 2D image; they do not affect the CPD image.)
Turn gain counterclockwise to decrease the amount of CPD gain.
1 Image the vessel using a Doppler phantom. Verify that as the gain controls increase and
decrease, Doppler echo intensity increases and decreases to correspond. Verify that no flow
exists outside the vessel.
2 Save a CPD image by pressing the Freeze key and then the Save key.
Test M Mode
Imaging
1 Attach a C60e transducer and acquire an image.
2 Press the MMode key for the M Mode sample line.
3 Position the M Mode sample line over the image using the touchpad.
4 Press the MMode key again to turn on M Mode.
5 Select the desired sweep speed from the on-screen menu (slow, med, or fast). The on-screen
menu will show the selected sweep speed.
6 Press the Freeze key to freeze the image. Press it again to return to live imaging.
7 Press the 2D key to return to 2D imaging.
Test THI
Imaging
1 Attach the C60e transducer and acquire an image.
2 Set the depth to maximum and note the depth at which echo information is lost.
3 Press the THI key on the control panel so it displays THI on the display. Tissue Harmonic
Imaging in now active.
4 Observe a decrease in dot size and a significant loss in penetration due to the higher
frequency. Image resolution increases.
5 Press the THI key again to turn off Tissue Harmonic Imaging.
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