Huang Yuexi, Webster Christie A, Wright Graham A
Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
J Magn Reson Imaging. 2002 May;15(5):541-50. doi: 10.1002/jmri.10100.
To compare the effectiveness of three image subtraction algorithms designed to improve arterial conspicuity in first-pass contrast-enhanced magnetic resonance (MR) angiography.
Three subtraction methods were analyzed through computer simulations, phantom studies, and clinical studies. These algorithms were: complex subtraction, magnitude subtraction, and maximum intensity projection subtraction.
In high resolution three-dimensional imaging, maximum intensity projection subtraction generally yields the best background suppression. Complex subtraction is effective in reducing partial volume effects in low resolution imaging. Magnitude subtraction works better in high resolution, low contrast concentration protocols.
Choosing the appropriate subtraction method according to the protocol is helpful in optimizing image quality.
比较三种旨在提高首次通过对比增强磁共振（MR）血管造影中动脉显影效果的图像减法算法的有效性。
通过计算机模拟、体模研究和临床研究分析了三种减法方法。这些算法分别是：复数减法、幅度减法和最大强度投影减法。
在高分辨率三维成像中，最大强度投影减法通常能产生最佳的背景抑制效果。复数减法在低分辨率成像中有效减少部分容积效应。幅度减法在高分辨率、低对比剂浓度方案中效果更好。
根据方案选择合适的减法方法有助于优化图像质量。
