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7 Cards in this Set
- Front
- Back
If the primary note is 1 Mhz, what is the
2nd harmonic? 3rd harmonic? 4th harmonic? |
2 Mhz
3 Mhz 4 Mhz |
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What is the normal Doppler shift in medical imaging?
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20 Hz - 20,000 Hz
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An object moving toward the transducer produces a ____ Doppler shift.
An object moving away from the transducer produces a _____ Doppler shift. |
positive
negative |
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Doppler shifts are normally expressed in units of ___.
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Khz
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The optimal Doppler angle of measurement which our equipment is set for is ____ degrees.
|
60
|
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Fast Fourier transform is a technique which converts the Doppler shift into a display, known as the Doppler ____.
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spectrum
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Each Doppler spectrum can determine ____, ___, ___, and ____.
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1. direction of flow (postive or negative waveform)
2. velocity of flow (height of waveform) 3. duration of flow (width of waveform) 4. # of RBCs or reflectors (brightness of waveform) |