Relationship between color Doppler flash artifact and color-write priority
Presentation
Demonstration of the effect of color-write priority on the color Doppler flash artifact.
Patient Data
The image sequence and cine recording shows the lateral aspect of the knee in a longitudinal orientation, while the color gain is gradually increased. Initially only a small amount of actual vascular flow signal is present, while with an inappropriately increased color gain spurious color noise starts to appear. This however does not affect all areas equally, as hypoechogenic, darker regions demonstrate increased color noise. The causing factor is the color-write priority which represents a threshold above which no B-mode (grayscale) pixels can be overwritten by color signal.
Case Discussion
Spurious color noise e.g. that due to flash artifact affects tissues unevenly, with hypo/anechoic structures being much more prone to it. Also, while an inappropriately high color gain is well-recognized cause of color flash artifacts a too low(!) color-write priority threshold can also result in a similar result.
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