Frazzini V I, Kagetsu N J, Johnson C E, Destian S
Department of Radiology, St Luke's-Roosevelt Hospital Center, Columbia University College of Physicians and Surgeons, New York, NY 10025, USA.
Radiology. 1997 Jul;204(1):268-72. doi: 10.1148/radiology.204.1.9205258.
In 18 vertebral bodies with titanium fixation screws and in a phantom model, visualization of the vertebral body marrow was improved and susceptibility artifact was reduced on T1-weighted spin-echo magnetic resonance images when the direction of the frequency-encoding gradient was parallel to the long axis of the screw. A perpendicular direction improved image quality only when the region of interest was adjacent to the tip of the screw. In the phantom, the length of the screw was statistically significantly increased and the width and area were reduced (P <.001) when the gradient was parallel to the long axis of the screw.
在18个带有钛固定螺钉的椎体以及一个体模模型中，当频率编码梯度方向与螺钉长轴平行时，椎体骨髓在T1加权自旋回波磁共振图像上的可视化得到改善，并且磁敏感伪影减少。仅当感兴趣区域邻近螺钉尖端时，垂直方向可改善图像质量。在体模中，当梯度与螺钉长轴平行时，螺钉长度在统计学上显著增加，宽度和面积减小（P <.001）。
