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© 2003 by the American Institute of Ultrasound in Medicine
J Ultrasound Med 22:1055-1060 • 0278-4297

Cerebral Blood Flow Measurement by Color Velocity Imaging in Radiation-Induced Carotid Stenosis

Wynnie Wai Man Lam, MBBS, FRCR, Stella Sin Yee Ho, MPhil, Sing Fai Leung, FRCR, FHKAM, Ka Sing Wong, MD, MRCP and Constantine Metreweli, FRCR, FRCP

Departments of Diagnostic Radiology and Organ Imaging (W.W.M.L., S.S.Y.H., C.M.), Clinical Oncology (S.F.L.), and Medicine and Therapeutics (K.S.W.), Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.

Address correspondence and reprint requests to Wynnie Wai Man Lam, MBBS, FRCR, Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong. Email address: wynnie{at}cuhk.edu.hk.

Objective. To show whether there is any association between the development of neurologic symptoms and the total cerebral blood flow volume documented by color velocity imaging in patients with carotid stenosis that develops after radiotherapy. Methods. Twenty-three patients with nasopharyngeal carcinoma (4 female and 19 male; age range, 39–69 years; mean age, 55.6 years) and major extracranial carotid stenosis underwent color velocity imaging. In this group, 8 patients had symptoms of a stroke or transient ischemic attack, and the other 15 patients were asymptomatic. The color velocity imaging results in the symptomatic group were then compared with those in the asymptomatic group. Results. The cerebral blood flow in the symptomatic group was significantly lower than that in the asymptomatic group (224.1 ± 89.0 versus 532.5 ± 89.0 mL/min; P = .001). Conclusions. Cerebral blood flow as measured by color velocity imaging was lower in the symptomatic group. There is an association between the development of neurologic symptoms and blood flow volume.

Key Words: carotid stenosis • cerebral blood flow • color velocity imaging

Abbreviations: CCA, common carotid artery • CVI, color velocity imaging • ECA, external carotid artery • ICA, internal carotid artery • MRI, magnetic resonance imaging • SDI, spectral Doppler imaging • VA, vertebral artery




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