Inoue Yuuji, Yoneyama Masami, Nakamura Masanobu, Takemura Atsushi
Tsukuba Imaging Center, Ibaraki, Japan.
Yaesu Clinic, Tokyo, Japan.
Radiol Phys Technol. 2018 Jun;11(2):248-254. doi: 10.1007/s12194-018-0448-3. Epub 2018 Mar 7.
The two-dimensional Cartesian turbo spin-echo (TSE) sequence is widely used in routine clinical studies, but it is sensitive to respiratory motion. We investigated the k-space orders in Cartesian TSE that can effectively reduce motion artifacts. The purpose of this study was to demonstrate the relationship between k-space order and degree of motion artifacts using a moving phantom. We compared the degree of motion artifacts between linear and asymmetric k-space orders. The actual spacing of ghost artifacts in the asymmetric order was doubled compared with that in the linear order in the free-breathing situation. The asymmetric order clearly showed less sensitivity to incomplete breath-hold at the latter half of the imaging period. Because of the actual number of partitions of the k-space and the temporal filling order, the asymmetric k-space order of Cartesian TSE was superior to the linear k-space order for reduction of ghosting motion artifacts.
二维笛卡尔快速自旋回波（TSE）序列在常规临床研究中被广泛应用，但它对呼吸运动敏感。我们研究了笛卡尔TSE中能有效减少运动伪影的k空间顺序。本研究的目的是使用运动模型来证明k空间顺序与运动伪影程度之间的关系。我们比较了线性和非对称k空间顺序之间的运动伪影程度。在自由呼吸情况下，非对称顺序中鬼影伪影的实际间距比线性顺序中的间距增加了一倍。非对称顺序在成像后期对不完全屏气明显表现出较低的敏感性。由于k空间的实际分区数量和时间填充顺序，笛卡尔TSE的非对称k空间顺序在减少鬼影运动伪影方面优于线性k空间顺序。
