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Effect of machine parameters on variance display in Doppler color flow mapping
T Utsunomiya1, T Ogawa, S W King
1Department of Medicine, California College of Medicine, University of California, Irvine.
American Heart Journal
|December 1, 1990
Summary
Color Doppler variance imaging quantifies blood flow disturbances. Standardizing ultrasound machine settings like packet size and gain is crucial for accurate diagnosis of stenotic, regurgitant, and shunt lesions.
Area of Science:
- Medical Imaging
- Ultrasound Technology
- Fluid Dynamics
Background:
- Color Doppler variance is a key display modality for diagnosing blood flow abnormalities.
- Variance reflects the degree of flow disturbance, with wider spectra indicating greater variance.
- Variance area may quantify the severity of stenotic, regurgitant, and shunt lesions.
Purpose of the Study:
- To evaluate the impact of various ultrasound machine settings on color Doppler variance display.
- To determine which machine parameters significantly affect variance area measurements.
Main Methods:
- 101 free jet experiments were conducted.
- The effect of packet size, pulse repetition frequency, frame rate, system gain, transmit power, and MTI filter were assessed.
- Variance area was quantified using image analysis software.
Main Results:
- Packet size, pulse repetition frequency, and frame rate were inversely correlated with variance area (p<0.01, p<0.001, p<0.05 respectively).
- System gain and wall filter setting showed a direct correlation with variance area (p<0.001, p<0.01 respectively).
Conclusions:
- Ultrasound machine settings significantly influence color Doppler variance display.
- Standardization of machine parameters is essential for reliable evaluation of blood flow lesions using variance imaging.