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Diagnostic ultrasound ( PDFDrive )

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940 PART III Small Parts, Carotid Artery, and Peripheral Vessel Sonography

A

B

C

FIG. 26.33 Near Occlusion and Total Occlusion

of ICA. (A) Preocclusive trickle of low in a left ICA.

(B) Hypoechoic heterogenous plaque completely

occluding the lumen of the ICA. In this color Doppler

image, no low is demonstrated in the ICA. (C)

Color Doppler image shows an absence of low in

patient with ICA occlusion.

A

B

FIG. 26.34 ICA Occlusion. (A) Complete right ICA occlusion shows a spiked waveform consistent with an occlusion. (B) Proximal right ECA

tracing shows a low-resistance waveform consistent with collaterals to intracranial circulation, as well as increased velocity caused by a stenosis.

TAP, Temporal artery tap.

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