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Abstract

Changes in blood flow velocity and diameter of the middle cerebral artery during hyperventilation: assessment with MR and transcranial Doppler sonography.

J M Valdueza, J O Balzer, A Villringer, T J Vogl, R Kutter and K M Einhäupl
American Journal of Neuroradiology November 1997, 18 (10) 1929-1934;
J M Valdueza
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J O Balzer
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A Villringer
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T J Vogl
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R Kutter
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K M Einhäupl
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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 a range-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 ECG-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.

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American Journal of Neuroradiology
Vol. 18, Issue 10
1 Nov 1997
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Cite this article
J M Valdueza, J O Balzer, A Villringer, T J Vogl, R Kutter, K M Einhäupl
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 Nov 1997, 18 (10) 1929-1934;

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Changes in blood flow velocity and diameter of the middle cerebral artery during hyperventilation: assessment with MR and transcranial Doppler sonography.
J M Valdueza, J O Balzer, A Villringer, T J Vogl, R Kutter, K M Einhäupl
American Journal of Neuroradiology Nov 1997, 18 (10) 1929-1934;
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