标题： MR热图的焦点校正用于聚焦超声丘脑切开术的精确靶向 显示英文标题

标题： Focus Correction in MR thermography for Precise Targeting in Focused Ultrasound Thalamotomy

摘要： 目的：通过校正目标坐标与磁共振热成像所见热点之间的空间差异，调整消融焦点的位置。 方法：采用两步校正程序来补偿化学位移和k空间位移。第一步利用焦点周围的场图逐像素校正空间位移；第二步计算温度引起的TE变化图，以补偿焦点中心位置的偏移。 结果：使用场图和TE误差图调整了由化学位移和k空间中心偏移引起的约1毫米位移。平均温度误差减少到-0.05{\deg }℃，而仅使用化学位移校正时得到的平均温度误差为-0.11{\deg }℃。 结论：校正由磁场梯度和温度变化引起的k空间位移导致的热点空间位移，可以确保聚焦超声丘脑切开术的精确靶向。 显示英文摘要

摘要： Purpose: To adjust the location of the ablation focus by correcting the spatial discrepancy induced by temperature changes between the target coordinate and the hotspot as seen in MR thermography. Methods: A two-step correction procedure was used to account for the chemical and k-space shifts. The first step corrected the spatial shift pixel by pixel using the field map around the focus. The second step calculated the temperature-induced TE variation map to compensate for the center location offset of the focus. Results: The approximately 1mm shift caused by chemical shift and k-space center offset was adjusted using the field map and TE error map. The mean temperature error was reduced to -0.05{\deg}C, as opposed to -0.11{\deg}C obtained using only a chemical shift correction. Conclusion: Correcting for the spatial shifts of hotspots caused by field gradients and k-space shifts in temperature changes can ensure precise targeting in FUS thalamotomy.