DSAによる新しい相対的な血流量測定法の開発

概要

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The mean blood flow was measured with the mean transit time and vascular volume by DSA. Blood flow analyses reported up to now have not yet been put to practical use because of many clinical problems still not solved. We clarified those problems, developed a new method for relative blood flow measurement, and compared it with the conventional method. The new method is as follows : first, one ROI is set on the time image based on the parameter of time information in each pixel ; secondly, the mean transit time is determined by liner approximation of the time information and distance along the blood vessel by the least squares method. The relative vascular volume was determined by the time density curve. With this new method, the errors caused by a change in the regional blood flow velocity, noise and geometrical measurement could be decreased. Therefore, the accuracy of the blood flow measuremcnt compared with the conventional method was greatly improved. The phase information of the Fourier analysis far superior in accuracy than the other time parameters, because the accuracy did not drop when the measuring distance became shorter. The error of the relative blood flow measurement could be controlled below 10% for blood vesses of more than 3 mm in diameter and 3 cm length in continuous flow. Furthermore, for pulsatile flow, it may have excellent applications.
公益社団法人日本放射線技術学会の論文
1987-06-01