Diagnostic ultrasound ( PDFDrive )

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APPENDIX
Ultrasound Artifacts: A Virtual Chapter
Artifactual Vascular Flow
he Doppler efect (shit) is not speciic to vascular low and
occurs with movement of any relector toward or away from the
ultrasound beam. Fluid or solid tissue motion can mimic vascular
low. Transmitted pulsations, especially close to the heart or major
arteries, can therefore result in artifactual appearance of low
within thrombosed veins or avascular areas. Artifactual vascular
low can also be visualized if the color gain is too high or the
color-write priority is too high.
FIG. A.49 Artifactual Vascular Flow. Color Doppler jets in the
bladder use color motion to indicate that there is low from each ureteral
oriice. 18 (See Chapter 9, Fig. 9.42A.)
A
B
FIG. A.50 Artifactual Vascular Flow. Color low Doppler signal in pleural luid with debris. (A) Gray-scale sonogram shows left pleural luid
with much debris. (B) Color low Doppler signal. 20 (See Chapter 50, Fig. 50.14.)