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磁共振声辐射力成像作为一种新兴的高强度聚焦超声监控技术,能够通过检测组织内的微米级位移实现高强度聚焦超声焦点定位。文章提出将分段读出自旋平面回波序列应用于磁共振声辐射力成像检测。通过与目前常用的单次激发平面回波序列及二维自旋回波序列对比发现,该序列在有效缩短检测时间的同时不易引起图像畸变。位移定量结果显示,分段读出自旋平面回波序列检测到的位移大小与另两种方法有较高的一致性,并具有良好的重复性。此外,单次激发平面回波序列可以同时提供具有良好图像质量的垂直于声传播方向的冠状面位移图及平行于声传播方向的矢状面位移图,有助于把握高强度聚焦超声焦域的三维结构。
As a new monitoring technique of high intensity focused ultrasound, magnetic resonance radiofrequency imaging can achieve high-intensity focused ultrasound focusing by detecting the micrometer-scale displacement in the tissue. The article proposes to apply spin-plane spin-echo readout to the magnetic resonance sound radiation imaging. Compared with the commonly used single-shot plane echo sequence and two-dimensional spin echo sequence, it is found that this sequence is not easy to cause image distortion while effectively shortening the detection time. Displacement quantification results show that the magnitude of the displacement detected by the segment spin-plane echo sequence is in good agreement with the other two methods and has good repeatability. In addition, the single-shot plane echo sequence can simultaneously provide a coronal plane displacement map perpendicular to the direction of sound propagation and a sagittal displacement map parallel to the direction of sound propagation with good image quality, which is helpful for grasping the high-intensity focused ultrasound focal region The three-dimensional structure.