磁共振成像引导介入中三维针形状和偏转的实时估计
Real-Time Estimation of 3-D Needle Shape and Deflection for MRI-Guided Interventions.
作者信息
Park Yong-Lae, Elayaperumal Santhi, Daniel Bruce, Ryu Seok Chang, Shin Mihye, Savall Joan, Black Richard J, Moslehi Behzad, Cutkosky Mark R
机构信息
Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02115, USA.
Center for Design Research, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA.
出版信息
IEEE ASME Trans Mechatron. 2010 Dec;15(6):906-915. doi: 10.1109/TMECH.2010.2080360.
We describe a MRI-compatible biopsy needle instrumented with optical fiber Bragg gratings for measuring bending deflections of the needle as it is inserted into tissues. During procedures, such as diagnostic biopsies and localized treatments, it is useful to track any tool deviation from the planned trajectory to minimize positioning errors and procedural complications. The goal is to display tool deflections in real time, with greater bandwidth and accuracy than when viewing the tool in MR images. A standard 18 ga × 15 cm inner needle is prepared using a fixture, and 350-m-deep grooves are created along its length. Optical fibers are embedded in the grooves. Two sets of sensors, located at different points along the needle, provide an estimate of the bent profile, as well as temperature compensation. Tests of the needle in a water bath showed that it produced no adverse imaging artifacts when used with the MR scanner.
我们描述了一种配备光纤布拉格光栅的磁共振成像兼容活检针，用于在针插入组织时测量其弯曲挠度。在诸如诊断活检和局部治疗等操作过程中，跟踪任何工具与计划轨迹的偏差以最小化定位误差和操作并发症是很有用的。目标是实时显示工具挠度，其带宽和准确性高于在磁共振图像中查看工具时的情况。使用夹具制备一根标准的18号×15厘米内针，并沿其长度方向加工出350微米深的凹槽。将光纤嵌入凹槽中。位于针上不同点的两组传感器可提供弯曲轮廓估计以及温度补偿。在水浴中对该针进行的测试表明，与磁共振扫描仪一起使用时，它不会产生不良成像伪影。
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