THREE-DIMENSIONAL BLOOD FLOW VELOCITY IMAGE PROJECTION METHOD IN MAGNETIC RESONANCE DIAGNOSING APPARATUS

摘要

PROBLEM TO BE SOLVED: To realize a projection method which obtains a flow velocity image with limited error by using three-dimensional data acquired by employing a multiple phase sensitivity measuring method in a magnetic resonance diagnosing apparatus. SOLUTION: A three-dimensional data with multiple phase sensitivities is measured by a multiple phase sensitivity measuring method using a magnetic resonance diagnosing apparatus. Angio images 102 of slides are formed by using a complex difference to accomplish a maximum projection with respect to the visual axis of projection 101. In the maximum projection, the position 105 of a point at which the maximum value is reached in the direction of the visual axis is detected and a flow velocity at the maximum point is calculated to obtain a flow velocity projection image 106. A calculation of the flow velocity is performed by evaluating the phase of each phase sensitivity image and a correct flow velocity can be obtained. But it has the shortcoming that the error of a noise part is substantial. As the angio images 102 have a low value at the noise part, a blood vessel can be recognized stably. Thus, the position of a blood vessel part is recognized by the angio images 102 to evaluate the phase thereby reducing errors.