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A New Sonographic Technique for Assessing Carotid Artery Disease: Extended-Field-of-View Imaging

Yoshie HaraGo,a, Mitsugu Nakamuraa and Norihiko Tamakia

a From the Department of Neurosurgery, Kobe University School of Medicine, 7–5–7 Kusunoki-cho, Chuo-ku, Kobe, 650, Japan.



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  		FIG 1. A, Composite extended-FOV image in a patient with cervical spondylosis shows a partially hyperechoic plaque at the ICA (straight arrow). Note mild hyperplasia of the intima at the CCA and bifurcation (curved arrows).

B, Extended-FOV image with a selected original frame provides a more precise picture of the CCA. Intimal hyperplasia was detected (left, arrow). The dotted square on the extended-FOV image (right) represents the position of the original frame displayed on the left.

C, Selected original frame of the ICA shows a hyperechoic plaque (left, arrow).



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  		FIG 2. Extended-FOV sonogram shows atheromatous plaque at the carotid bifurcation that extended to the proximal ICA (straight arrows). The lumen was narrowed but the stenosis was less than 40%. Another small plaque was detected in the CCA (curved arrow). The normal double-line pattern was obscured at these sites of disease, and there was diffuse intimal hyperplasia at the CCA.



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  		FIG 3. A, Extended-FOV image with unacceptable image distortion due to large-scale patient motion. Irregular deformity and discontinuity of the arterial wall make precise evaluation of the wall structure difficult (arrow). The FOV is not satisfactorily extended.

B, Extended-FOV image with mild distortion due to arterial pulsation (right). A regular waveform deformity is present on the wall of the CCA (right, straight arrow). There is also a discontinuity of the artery due to improper probe operation (right, curved arrow). The original frame is free from the motion artifact and shows the normal double-line pattern of the artery (left).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X