How something looks is the:
Qualitative (Quality)
The waveform contour is the:
Qualitative (Quality)
How something measures velocities, ratios, indices is the:
Quantitative
Capabilities of CW Doppler:
- Presence/absence of arterial occlusive disease
- Approximate level of disease
What arteries are connected by the common iliac arteries?
Aorta to external & internal iliac arteries
________ requires 2 crystals.
1 transmitting & 1 receiving
Continuous wave
Limitations of CW Doppler analysis:
- Not exact location or severity of disease
- Tech dependent
____________ = Time from beginning of systole to peak AKA Upstroke
Acceleration time
Increased acceleration time > 133msec =
Proximal (inflow) disease
Normal PI ___________as you go down the limb
Increases
__________ is non-imaging, only shows waveform
Continuous wave
____________ recording: Doppler shifts are within audible range
Audio
- How it measures
- Velocities, ratios, indices
- % diameter reduction
Quantitive
“quantity”
- How it looks
- NOT Measurable
- Waveform contour
Qualitative
“quality”
____________ is not depth specific (range resolution) unable to choose location of signal
Continuous wave
Type of recordings for CW Doppler analysis
- Audio
- Analog
- Spectral
________ recording : Zero crossing frequency meter on strip chart recorder ESTIMATES frequency shifts, not very sensitive
Analog
Technique for CW Doppler analysis
- Supine
- 8-10 MHz
- Probe angle 45-60 degree
_________: displays TRUE or INDIVIDUAL frequency shifts according to time. More sensitive
Spectral analysis
Any drop in PI between levels =
Disease between those levels
Limitations of segmental pressure testing ( lower extremity)
- Not exact location
- Stenosis vs occlusion
Capabilities of segmental pressure testing (Lower Extremities)
- Presence / absence of disease
- Approximate level & severity
