MEASUREMENT FOR BLOOD FLOW VELOCITY DISTRIBUTION

摘要

PURPOSE:To determine a two-dimensional blood flow velocity distribution by taking picture of sections including blood flow separately several times by two kinds of photographing methods using a high frquency pulse different in the excitation width across the sectional width from a magnetic resonance imaging unit to learn a relaxing time distribution effected by blood flow. CONSTITUTION:Tomographic images including blood flow of an object to be measured are taken several times by a high frequency pulse different in the excitation width across the sectional width with a magnetic resonance imaging unit employing two kinds of measuring methods, for example, saturation and inversion recovery methods of pulse system. Then, a relaxing time distribution affected by blood flow is prepared and blood flow velocity is determined in terms of the same pixel of the relaxing distribution time using the corresponding relaxing time distribution and excitation width. This enables the determination of a two-dimensional blood flow velocity distribution by a simple combination of pulse sequences in stead of relying on the bearing of the longitudinal relaxing time above at the time of halting blood flow.