1. IADSA による頸動脈血流量測定(放射線機器を用いた血流計測の現状と将来)

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The author reports on current trial methods, and examines technical problems concerning blood flow measurement by DSA. Precision of this method depends on the measurement of the blood vessel intra-volume and mean transit time. For the measurement of the blood vessel intra-volume using an amplitude image the diameter of the blood vessel was measured as the Full Width Half Maximum of the profile curve in the transaxial direction of the blood vessel. Diameters of short length sections of the blood vessels were calculated, and then the mean diameter of the blood vessel was determined. Blood vessel volume in the ROI was calculated geometrically, and geometrical enlargement was corrected depending on the depth of the blood vessel. Measurement error was decreased by the use of this averaging method. For the measurement of the mean transit time, the time lag between the two ends of the ROI was measured as a linear approximation of the relationship between distance and time, using time parameters of the above short length sections. On the graph, measurement error was decreased by the exclusion of the areas of turbulant blood flow caused by the shape of blood vessel itself, and those caused by the injection of contrast medium from the tip of the catheter. As for the time parameters, the phase value of the first Fourier transform of the timedensity curve and the peak time of the fitted Gamma-function curve, were adopted for reasons of accuracy compared to other examined parameters. For these two parameters, automated processing, to detect the rise point of the time-density curve, improved the measurement precision of these two time parameters.
公益社団法人日本放射線技術学会の論文
1991-01-01

1. IADSA による頸動脈血流量測定(放射線機器を用いた血流計測の現状と将来)

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