Butts Kim, Pauly John M, Gold Garry E
Department of Radiology, Stanford University, Stanford, California, USA.
Magn Reson Med. 2005 Feb;53(2):418-24. doi: 10.1002/mrm.20375.
Magnetic resonance imaging (MRI) in the presence of metallic objects suffers from slice-selection errors and in-plane distortions. View angle tilting (VAT) corrects for in-plane distortions by adding a gradient on the slice-select axis during readout, but can suffer from image blurring. This work demonstrates that the major source of blurring is a slice profile modulation of the data, and proposes several solutions to prevent such blurring. Multiple high-bandwidth readouts are demonstrated to reduce the blurring while improving the signal-to-noise ratio (SNR) over a single high-bandwidth readout.
在存在金属物体的情况下进行磁共振成像(MRI)会出现切片选择误差和面内畸变。视角倾斜(VAT)通过在读取期间在切片选择轴上添加梯度来校正面内畸变,但可能会出现图像模糊。这项工作表明,模糊的主要来源是数据的切片轮廓调制,并提出了几种防止这种模糊的解决方案。与单次高带宽读取相比,多次高带宽读取被证明可以减少模糊,同时提高信噪比(SNR)。