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Blood Flow Volume Quantification of Cerebral Ischemia

Comparison of Three Noninvasive Imaging Techniques of Carotid and Vertebral Arteries

¹ All authors: Department of Diagnostic Radiology and Organ Imaging, Prince of Wales Hospital, Shatin, Hong Kong, China.

View larger version (127K): [in a new window]   Fig. 1A. —Blood flow volume measurement of internal carotid artery by different techniques in 58-year-old man who recently had minor stroke. Spectral Doppler imaging quantification shows proximal segment of internal carotid artery (ICA). Angle-corrected mean velocity (48.9 cm/sec) and perpendicular vessel diameter (0.43 cm) at site of interrogation were used in calculation of blood flow volume. Obtained value was 426.1 mL/min.

View larger version (109K): [in a new window]   Fig. 1B. —Blood flow volume measurement of internal carotid artery by different techniques in 58-year-old man who recently had minor stroke. Color velocity imaging quantification shows blood flow volume measurement of same segment (A). Flow volume of 198 mL/min was computed in this vessel on colour M-mode. Note discrepancy of values between two techniques.

View larger version (120K): [in a new window]   Fig. 1C. —Blood flow volume measurement of internal carotid artery by different techniques in 58-year-old man who recently had minor stroke. MR phase-contrast flow quantification on high-resolution nontriggered two-dimensional phase-contrast axial images (TR/TE, 30/9.7; flip angle, 150°) shows same internal carotid artery (A) with flow data display. Image was at plane perpendicular to left internal carotid artery on MR angiography. Left upper image is magnitude image on which region of interest (ROI) at left internal carotid artery was drawn. Right upper image is phase image on which ROI drawn at left internal carotid artery on magnitude image was transposed. Respective flow information (3.49 mL/sec) was displayed on lower table corresponding to 209.4 mL/min.

View larger version (12K): [in a new window]   Fig. 2. —Line graph shows variation of flow volume by different techniques in phantom simulation study. [UNK] = ideal, x = color velocity imaging quantification, = spectral Doppler imaging quantification, = MR phase-contrast flow quantification.

View larger version (13K): [in a new window]   Fig. 3A. —Plots show differences between blood flow volume measurements in internal carotid arteries in paired techniques against their mean. Plot shows color velocity imaging quantification versus MR phase-contrast flow quantification.

View larger version (13K): [in a new window]   Fig. 3B. —Plots show differences between blood flow volume measurements in internal carotid arteries in paired techniques against their mean. Plot shows MR phase-contrast flow quantification versus spectral Doppler imaging quantification.

View larger version (14K): [in a new window]   Fig. 3C. —Plots show differences between blood flow volume measurements in internal carotid arteries in paired techniques against their mean. Plot shows color velocity imaging quantification versus spectral Doppler imaging quantification.

View larger version (11K): [in a new window]   Fig. 4A. —Plots of differences between blood flow volume measurements in vertebral arteries in paired techniques against their mean. Plot shows color velocity imaging quantification versus MR phase-contrast flow quantification.

View larger version (11K): [in a new window]   Fig. 4B. —Plots of differences between blood flow volume measurements in vertebral arteries in paired techniques against their mean. Plot shows MR phase-contrast flow quantification versus spectral Doppler imaging quantification.

View larger version (12K): [in a new window]   Fig. 4C. —Plots of differences between blood flow volume measurements in vertebral arteries in paired techniques against their mean. Plot shows color velocity imaging quantification versus spectral Doppler imaging quantification.

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