DIGITAL SUBTRACTION MAGNETIC RESONANCE ANGIOGRAPHY WITH IMAGE ARTIFACT SUPPRESSION

摘要

A dynamic MRA study of a subject is performed using a 3D fast gradient-recalled echo pulse sequence. The frame rate of the resulting series of reconstructed images is increased by sampling a central region of k-space at a higher rate than the peripheral regions of k-space. Artifacts caused by variations in signal strength as the contrast agent enters the region of interest are reduced by renormalizing the acquired data. 2D image frames are reconstructed using planes passing near the center of k-space to enable the operator to select which 3D data sets should be used to reconstruct diagnostic images.