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16 Cards in this Set
- Front
- Back
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Name the first five things used to optimize 2D Image
1 2 3 4 5 |
1. Gain
2. TGC 3. Depth 4. Focus 5. Dynamic Range |
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What controls affect the frame rate?
1 2 3 4 5 6 |
1. Depth
2. Write Zoom 3. Sector Size/Wide View 4. Multiple Focal pts 5. Frame Rate Function 6. Spatial Compounding |
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What 4 functions BESIDES magnification allow you to adjust the frozen image?
1 2 3 4 |
1. Gain
2. Dynamic Range 3. TGC 4. Gamma/Grayscale |
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Name and Explain the 3 components of Tri-phasic Flow.
1st Component: 2nd Component: 3rd Component: |
1st: Forward Flow; systolic pumping of the heart
2nd:Reversal Flow; resistance caused by distal pressure 3rd:Low velocity forward flow; Elastic recoil of vessel during diastole |
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How do you avoid aliasing in spectral Doppler?
1 2 3 4 5 6 |
Increase PRF
Use a lower frequency Transducer Increase Angle Decrease Depth Adjust Baseline Use CW Doppler |
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Name 5 things you should address first when obtaining spectral waveform.
1 2 3 4 5 |
1. Good Long-Axis View
2. Adjust Cursor Parallel to flow, with proper gate size and location 3. Gain 4. Scale 5. Wall Filter |
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To adjust the angle so that it is < or = 60 degrees, parallel to flow or vessel wall, technologist can...
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1. Heel/Toe Transducer
2. Steer Line of Insonation 3. Adjust Cursor Angle |
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What can you do to eliminate spectral broadening?
1 2 3 4 5 6 |
1. Increase Wall Filter
2. Increase Dynamic Range 3. Decrease Gain 4. Decrease Gate Size 5. Adjust line of insonation to get more parallel w/flow 6. Make sure vessel is in true long-axis, no salami |
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No velocities are detectable in a VERY tight stenosis. What can you do to demonstrate flow in the vessel?
1 2 3 4 5 |
1. Decrease Dynamic Range (Increase Compression)
2. Decrease Wall Filter 3. Decrease Scale 4. Increase Gate Size 5. Increase Gain |
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Spectrum is cut off, how can you eliminate this artifact?
1 2 3 4 5 6 |
1. Increase Scale/PRF
2. Increase Angle 3. Decrease Depth 4. Decrease Frequency 5. Adjust Baseline 6. Use CW doppler (unlimited PRF) |
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Doppler Signal is Audible, but spectral waveform cannot be seen, (Assume PW is on). What can you do to fix it?
1 2 3 |
1. Increase Gain
2. Decrease Dynamic Range 3. Adjust Gamma/Grayscale |
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You are imaging a healthy vessel with blood flow through it, no color can be seen. What can you do to improve it?
1 2 3 4 5 6 7 |
Increase Gain
Increase Power Decrease Wall Filter Decrease Scale Decrease Frequency Adjust color box angle to be parallel w/flow Increase Data Number |
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Color Doesn't fill the entire vessel. What can you do to improve color filling?
1 2 3 4 5 6 7 |
Decrease Scale
Decrease CF Frequency Decrease Wall Filter Increase Data Number Increase Gain Increase Acoustic Power Increase Frame interpolate |
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Color display shows aliasing. how can you elminiate this artifact?
1 2 3 4 5 |
Increase Scale
decrease Frequency Decrease Depth Increase Angle Adjust baseline |
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The frame rate is too slow. What can be done to adjust it?
1 2 3 4 |
Increase FR Function
decrease Data Number decrease Depth decrease depth/width of box |
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Color image is noisy. what can you do to fix it?
1 2 3 4 5 |
Decrease Gain
Increase Filter Increase Scale Increase Time Smoothing Increase persistance |
