title: Cerebral blood flow measurement by color velocity imaging in radiation-induced carotid stenosis.
abstract: 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.
authors: 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. wynnie@cuhk.edu.hk
authors: Wynnie Wai Man
authors: WW
authors: Lam
authors: Stella Sin Yee
authors: SS
authors: Ho
authors: Sing Fai
authors: SF
authors: Leung
authors: Ka Sing
authors: KS
authors: Wong
authors: Constantine
authors: C
authors: Metreweli
mesh_terms: D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity; D002339:Carotid Arteries / Q000000981:diagnostic imaging; D016893:Carotid Stenosis / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology*; D002544:Cerebral Infarction / Q000209:etiology / Q000503:physiopathology; D002560:Cerebrovascular Circulation; D005260:Female; D006801:Humans; D002546:Ischemic Attack, Transient / Q000209:etiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000532:radiotherapy; D011832:Radiation Injuries / Q000000981:diagnostic imaging / Q000503:physiopathology*; D018615:Ultrasonography, Doppler, Color; D014711:Vertebral Artery / Q000000981:diagnostic imaging