Tang C, Blatter D D, Parker D L
Department of Physics, University of Utah, Salt Lake City, USA.
J Magn Reson Imaging. 1995 Mar-Apr;5(2):175-80. doi: 10.1002/jmri.1880050212.
Because of the relatively small size of vessels and limited magnetic resonance (MR) imaging resolution, the accuracy of volume flow rate measurements is limited. A technique that corrects the partial-volume effect in volume flow rate measurements is presented. The technique uses small-phase-shift approximation, with the assumption that blood flow in the voxels at the boundary of the vessel is slow. With the proposed correction technique, the volume flow rate in partially occupied voxels is corrected on a voxel-by-voxel basis and the accuracy of flow measurements increases. Results are shown analytically and for MR phantom data.
由于血管尺寸相对较小且磁共振（MR）成像分辨率有限，体积流量测量的准确性受到限制。本文提出了一种校正体积流量测量中部分容积效应的技术。该技术采用小相移近似，并假设血管边界体素内的血流缓慢。通过所提出的校正技术，对部分占据体素的体积流量逐个体素进行校正，从而提高了流量测量的准确性。文中给出了分析结果以及针对MR体模数据的结果。
