Hattori Masumi, Koyama Shuji, Maeda Hisatoshi
Department of Radiology, Tokai Memorial Hospital, Nagoya, Japan.
Nihon Hoshasen Gijutsu Gakkai Zasshi. 2002 Apr;58(4):487-94. doi: 10.6009/jjrt.kj00001364385.
A convenient, accurate method to measure the modulation transfer function (MTF) of magnetic resonance(MR) images is discussed. To avoid any distortion of the edge spread function(ESF) which is inadvertently produced by the magnitude operator, the MTF was calculated from the ESF obtained from the salad-oil/water interface. Our MTF findings closely correlated with the MTF findings as calculated by an alternate method (Steckner et al.). Our method was only adapted to some specific sequences and some specific encoding directions, however, MTF was successfully obtained by the magnitude operator without any errors. In our method, the production and arrangement of phantoms were also easier to control. Our new method is therefore considered to be useful for evaluating the resolution property of MR images from various institutions.
本文讨论了一种方便、准确地测量磁共振（MR）图像调制传递函数（MTF）的方法。为避免幅度算子无意中产生的边缘扩展函数（ESF）的任何失真，MTF是根据从色拉油/水界面获得的ESF计算得出的。我们的MTF结果与通过另一种方法（Steckner等人）计算得出的MTF结果密切相关。然而，我们的方法仅适用于某些特定序列和某些特定编码方向，幅度算子成功地获得了MTF且没有任何误差。在我们的方法中，体模的制作和排列也更容易控制。因此，我们的新方法被认为对于评估来自不同机构的MR图像的分辨率特性很有用。
