ACCURACY OF PHASE-CONTRAST FLOW MEASUREMENTS IN THE PRESENCE OF PARTIAL-VOLUME EFFECTS
ACCURACY OF PHASE-CONTRAST FLOW MEASUREMENTS IN THE PRESENCE OF PARTIAL-VOLUME EFFECTS
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DOI：
10.1002/jmri.1880030213
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发表时间：
1993-03-01
期刊：
影响因子：
--
通讯作者：
PARKER, DL
中科院分区：
文献类型：
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作者：
TANG, C;BLATTER, DD;PARKER, DL
通过计算机模拟和体外实验对相衬法测量体积流量的准确性进行了评估。研究的因素包括（a）由于体素尺寸相对于血管尺寸和方向的部分体积效应和（B）体素内相位分散。结果表明，有限的分辨率（部分体积效应）是准确测量层流和活塞流流量的主要障碍。结果表明，至少16个体素必须覆盖血管腔的横截面，以获得测量精度在10%以内。测量精度也很大程度上取决于静止组织的相对信号强度，并且对于层流比活塞流更好。
The accuracy of volume flow rate measurements obtained with phase-contrast methods was assessed by means of computer simulation and in vitro experiments. Factors studied include (a) the partial-volume effect due to voxel dimensions relative to vessel dimensions and orientation and (b) intravoxel phase dispersion. It is shown that limited resolution (partial-volume effect) is the major obstacle to accurate flow measurement for both laminar and plug flow. The results show that at least 1 6 voxels must cover the cross section of the vessel lumen to obtain a measurement accuracy to within 10%. Measurement accuracy also greatly depends on the relative signal intensity of stationary tissue and is better for laminar flow than plug flow.