Krieger Axel, Csoma Csaba, Iordachital Iulian I, Guion Peter, Singh Anurag K, Fichtinger Gabor, Whitcomb Louis L
Department of Mechanical Engineering, Johns Hopkins University, Baltimore, USA.
Med Image Comput Comput Assist Interv. 2007;10(Pt 2):59-67. doi: 10.1007/978-3-540-75759-7_8.
This paper reports a novel system for magnetic resonance imaging (MRI) guided transrectal prostate interventions, such as needle biopsy, fiducial marker placement, and therapy delivery. The system utilizes a hybrid tracking method, comprised of passive fiducial tracking for initial registration and subsequent incremental motion measurement along the degrees of freedom using fiber-optical encoders and mechanical scales. Targeting accuracy of the system is evaluated in prostate phantom experiments. Achieved targeting accuracy and procedure times were found to compare favorably with existing systems using passive and active tracking methods. Moreover, the portable design of the system using only standard MRI image sequences and minimal custom scanner interfacing allows the system to be easily used on different MRI scanners.
本文报道了一种用于磁共振成像（MRI）引导经直肠前列腺介入手术的新型系统，如穿刺活检、基准标记放置和治疗输送。该系统采用了一种混合跟踪方法，包括用于初始配准的被动基准跟踪，以及随后使用光纤编码器和机械刻度沿自由度进行增量运动测量。在前列腺体模实验中评估了该系统的靶向精度。结果发现，该系统实现的靶向精度和手术时间与使用被动和主动跟踪方法的现有系统相比具有优势。此外，该系统采用便携式设计，仅使用标准MRI图像序列且与定制扫描仪的接口最少，这使得该系统能够轻松地在不同的MRI扫描仪上使用。
