Measurement of Blood Flow Velocity in the Carotid Artery by MRI Flow Mapping: Comparison with Ultrasonic Doppler.

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Recently, it has become possible to measure blood flow velocity by MRI flow mapping. This study was designed to evaluate the accuracy of MRI flow mapping for measuring blood flow velocity in the common carotid artery (CCA), in comparison with a conventional ultrasonic quantitative flow measurement system (QFM) .<BR>We studied 58 patients aged 19-74 years (mean age, 40 years; 20 males, 38 females) without cerebrovascular disorders, essential hypertension, diabetes mellitus, or hyperlipidemia. The maximum and mean blood flow velocity of the CCA were determined by QFM 2000 XA (Nippon Koden Co.) and MRI (Siemens Co. 1.0T) based on MRI phase-contrast measurement. Technical parameters of MRI were: TR/TE/FA=31 ms/6 ms/25, slice=6 mm, matrix=256 × 256, field of view = 200 × 200 mm.<BR>The maximum blood flow velocity was 55.2 ± 16.8 cm/s by QFM, and 56.8 ± 15.5 cm/s by MRI. The maximum flow velocity in the CCA determined by MRI was significantly correlated with that determined by QFM (r=0.69, p<0.001), and the two methods were in good agreement. The mean flow velocity in the CCA was 22.6±5.6cm/s by QFM, and 25.3±7.3 cm/s by MRI. The mean flow velocity measured by MRI was higher than that measured by QFM, but the two values were significantly correlated (r=0.59, p<0.001) .<BR>These results indicate that the maximum blood flow velocity in the CCA as measured by MRI is in good agreement with that determined by QFM.
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