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J. Imaging 2018, 4(12), 140; https://doi.org/10.3390/jimaging4120140

MRI Robot for Prostate Focal Laser Ablation: An Ex Vivo Study in Human Prostate

1
Center for Interventional Oncology, National Institutes of Health (NIH), Bethesda, MD 20814, USA
2
Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701, USA
3
School of Electrical and Computer Engineering, University of Georgia, Athens, GA 30602, USA
*
Author to whom correspondence should be addressed.
Received: 15 September 2018 / Revised: 30 October 2018 / Accepted: 22 November 2018 / Published: 29 November 2018
(This article belongs to the Special Issue Image-Guided Medical Robotics)
Full-Text   |   PDF [5174 KB, uploaded 29 November 2018]   |  

Abstract

Purpose: A novel grid-template-mimicking MR-compatible robot was developed for in-gantry MRI-guided focal laser ablation of prostate cancer. Method: A substantially compact robot was designed and prototyped to meet in-gantry lithotomy ergonomics and allow for accommodation in the perineum. The controller software was reconfigured and integrated with the custom-designed navigation and multi-focal ablation software. Three experiments were conducted: (1) free space accuracy test; (2) phantom study under computed tomography (CT) guidance for image-guided accuracy test and overall workflow; and (3) magnetic resonance imaging (MRI)-guided focal laser ablation of an ex vivo prostate. The free space accuracy study included five targets that were selected across the workspace. The robot was then commanded five times to each target. The phantom study used a gel phantom made with color changing thermos-chromic ink, and four spherical metal fiducials were deployed with the robot. Then, laser ablation was applied, and the phantom was sliced for gross observation. For an MR-guided ex vivo test, a prostate from a donor who died of prostate cancer was obtained and multi-focally ablated using the system within the MRI gantry. The tissue was sliced after ablation for validation. Results: free-space accuracy was 0.38 ± 0.27 mm. The overall system targeting accuracy under CT guidance (including robot, registration, and insertion error) was 2.17 ± 0.47 mm. The planned ablation zone was successfully covered in both acrylamide gel phantom and in human prostate tissue. Conclusions: The new robot can accurately facilitate fiber targeting for MR-guided focal laser ablation of targetable prostate cancer. View Full-Text
Keywords: MRI robot; MRI-compatible; focal laser ablation; ex vivo prostate MRI robot; MRI-compatible; focal laser ablation; ex vivo prostate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Seifabadi, R.; Li, M.; Xu, S.; Chen, Y.; Squires, A.; Negussie, A.H.; Bakhutashvili, I.; Choyke, P.; Turkbey, I.B.; Tse, Z.T.H.; Wood, B.J. MRI Robot for Prostate Focal Laser Ablation: An Ex Vivo Study in Human Prostate. J. Imaging 2018, 4, 140.

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