Insana Lab: Ultrasonic Imaging - The University of Illinois at Urbana-Champaign

Insana Lab: Ultrasound Research Interface (URI)

More Color Doppler

The following example images were all processed from the same RF data frame (cross-section of carotid artery), but the filter and threshold parameters were varied.
Estimated velocities appear differently in each image.
Each filter and threshold value may have its own bias. We suggest that you try different filter settings for processing.
The type of transducer and imaging mode can also influence wall filter performance and velocity estimation.

	Filter: IIR order: 2 cutoff: 0.6 tissue threshold: 0.98 clutter threshold: 0.04 velocity threshold: 0.01 decimation factor: 2 smoothing gate: 0
	Filter: IIR order: 4 cutoff: 0.3 tissue threshold: 0.99 clutter threshold: 0.01 velocity threshold: 0.01 decimation factor: 4 smoothing gate: 0
	Filter: Regression order: 3 tissue threshold: 0.99 clutter threshold: 0.005 velocity threshold: 0.01 decimation factor: 4 smoothing gate: 0
	Filter: RMS Chebyshev order: 2 cutoff: 0.4 passband rippler: 0.5 tissue threshold: 0.8 clutter threshold: 0.0012 velocity threshold: 0.01 decimation factor: 4 smoothing gate: 0
	Filter: Eigen order: 1 tissue threshold: 0.4 clutter threshold: 0.006 velocity threshold: 0.01 decimation factor: 1 smoothing gate: 0
	Filter: IIR order: 2 cutoff: 0.8 tissue threshold: 0.9 clutter threshold: 0.04 velocity threshold: 0.01 decimation factor: 2 smoothing gate: 8
	Filter: IIR order: 2 cutoff: 0.1 tissue threshold: 0 clutter threshold: 0 velocity threshold: 0 decimation factor: 1 smoothing gate: 0