Xu Helen, Lasso Andras, Vikal Siddharth, Guion Peter, Krieger Axel, Kaushal Aradhana, Whitcomb Louis L, Fichtinger Gabor
Queen's University, Kingston, Canada.
Proc SPIE Int Soc Opt Eng. 2010 Feb 23;7625(2010):762517-762518. doi: 10.1117/12.844251.
We report a quantitative evaluation of the clinical accuracy of a MRI-guided robotic prostate biopsy system that has been in use for over five years at the U.S. National Cancer Institute. A two-step rigid volume registration using mutual information between the pre and post needle insertion images was performed. Contour overlays of the prostate before and after registration were used to validate the registration. A total of 20 biopsies from 5 patients were evaluated. The maximum registration error was 2 mm. The mean biopsy target displacement, needle placement error, and biopsy error was 5.4 mm, 2.2 mm, and 5.1 mm respectively. The results show that the pre-planned biopsy target did dislocate during the procedure and therefore causing biopsy errors.
我们报告了对一种MRI引导的机器人前列腺活检系统临床准确性的定量评估，该系统在美国国立癌症研究所已使用超过五年。使用针插入前后图像之间的互信息进行两步刚性体积配准。配准前后前列腺的轮廓叠加用于验证配准。共评估了5名患者的20次活检。最大配准误差为2毫米。活检目标平均位移、针放置误差和活检误差分别为5.4毫米、2.2毫米和5.1毫米。结果表明，预先计划的活检目标在手术过程中确实发生了移位，从而导致活检误差。
