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Titolo:
CHANGES IN BLOOD-FLOW VELOCITY AND DIAMETER OF THE MIDDLE CEREBRAL-ARTERY DURING HYPERVENTILATION - ASSESSMENT WITH MR AND TRANSCRANIAL DOPPLER SONOGRAPHY
Autore:
VALDUEZA JM; BALZER JO; VILLRINGER A; VOGL TJ; KUTTER R; EINHAUPL KM;
Indirizzi:
HUMBOLDT UNIV BERLIN,HOSP CHARITE,DEPT NEUROL,SCHUMANNSTR 20-21 D-10117 BERLIN GERMANY HUMBOLDT UNIV BERLIN,VIRCHOW CLIN,DEPT RADIOL BERLIN GERMANY
Titolo Testata:
American journal of neuroradiology
fascicolo: 10, volume: 18, anno: 1997,
pagine: 1929 - 1934
SICI:
0195-6108(1997)18:10<1929:CIBVAD>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-DIOXIDE; ULTRASOUND; QUANTIFICATION; PRESSURE; HUMANS; VALUES;
Keywords:
ARTERIES, CEREBRAL, MIDDLE; CEREBRAL BLOOD FLOW; MAGNETIC RESONANCE, FLOW STUDIES; ULTRASOUND, DOPPLER;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Valdueza et al., "CHANGES IN BLOOD-FLOW VELOCITY AND DIAMETER OF THE MIDDLE CEREBRAL-ARTERY DURING HYPERVENTILATION - ASSESSMENT WITH MR AND TRANSCRANIAL DOPPLER SONOGRAPHY", American journal of neuroradiology, 18(10), 1997, pp. 1929-1934

Abstract

PURPOSE: To compare blood flow velocity changes within the middle cerebral artery (MCA) during hyperventilation, as measured with by both transcranial Doppler sonography and MR imaging, with the diameter of the MCA as measured with MR imaging alone. METHODS: The studies were performed in six healthy Volunteers ranging in age-from 22 to 31 years (mean, 27 years), Transcranial Doppler sonography was carried out with arange-gated 2-MHz transducer. MR examinations were done on a 1.5-T imaging unit. MR angiography was performed using the time-of-flight technique. MR flow measurements were carried out by using the phase-mapping technique with an EGG-triggered phase-contrast sequence. RESULTS: During hyperventilation, the mean blood flow velocity of the proximal MCA declined by 49.6% +/- 5.7 (mean +/- standard deviation) as measured with Doppler sonography, and by 47% +/- 4.6 as measured with MR flow calculation, The diameter of the MCA (3.4 +/- 0.3 mm) remained unchanged on MR imaging studies (3.3 +/- 0.3 mm), CONCLUSION: We found a good correlation between relative flow velocity changes measured by transcranial Doppler sonography and MR techniques. MR imaging revealed no significant changes in the diameter of the proximal MCA during normal Versus hyperventilation. Relative changes in flow velocity in the MCA would thereby reflect relative changes in cerebral blood flow, at least during hyperventilation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 13:27:55