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Updated: May 21, 2026
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A Cognitive Fusion-guided Prostate Biopsy Using Multiparametric Magnetic Resonance Imaging and Transrectal Ultrasound
Published on: March 21, 2025
Accuracy study of a robotic system for MRI-guided prostate needle placement
Reza Seifabadi1, Nathan B J Cho, Sang-Eun Song
1Laboratory for Percutaneous Surgery (Perk Lab), Queen's University, Kingston, ON, Canada.
Summary
This study quantified and minimized errors in MRI-guided robotic prostate biopsy systems. The robotic system
Area of Science:
- Medical Robotics
- Image-Guided Interventions
- Prostate Cancer Diagnostics
Background:
- Accurate needle placement is critical for percutaneous MRI-guided prostate interventions.
- Understanding and minimizing needle placement error in robotic systems is essential for improving biopsy accuracy.
Purpose of the Study:
- To identify, quantify, and minimize sources of needle placement error in an MRI-guided robotic system for prostate biopsy.
- To evaluate the contribution of robotic system errors versus needle-tissue interaction errors.
Main Methods:
- A prostate phantom was used to evaluate overall needle placement error.
- Systematic error (before-insertion) and needle-tissue interaction error (due-to-insertion) were quantified.
- A calibration methodology was developed to minimize manipulator errors; sterilization effects were also assessed.
Main Results:
- The average overall system error was 2.5 mm (STD = 1.1 mm).
- Needle-tissue interaction error (approx. 2.13 mm) was a larger contributor than robotic system error (1.3 mm).
- Robot calibration improved targeting accuracy to 0.71 mm (STD = 0.21 mm) with repeatability of 0.13 mm; sterilization had no significant impact.
Conclusions:
- The presented methodology aids in identifying, quantifying, and minimizing errors in MRI-guided robotic systems for prostate interventions.
- The analyzed robotic system demonstrated an overall needle placement error within acceptable clinical ranges.
