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Three-dimensional prostate ultrasound and its application to cryosurgery
1Division of Urology, London Health Sciences Centre, University of Western Ontario, London, Canada.
Techniques in Urology
|January 1, 1996
Summary
Three-dimensional transrectal ultrasound (3-D TRUS) improves prostate imaging by reconstructing 2-D scans into a 3-D view. This enhanced visualization aids in precise cryoprobe placement during prostate cancer cryoablation.
Area of Science:
- Urology
- Medical Imaging
- Oncology
Background:
- Transrectal ultrasound (TRUS) is vital for prostate imaging but uses 2-D techniques for 3-D anatomy.
- Limitations of standard 2-D TRUS can impact procedural accuracy.
Purpose of the Study:
- To introduce and evaluate a novel 3-D TRUS system for enhanced prostate imaging.
- To assess the utility of 3-D TRUS in guiding prostate cancer cryoablation procedures.
Main Methods:
- Development of a 3-D TRUS system integrating a motorized transducer assembly and computer-based image reconstruction software.
- Application of 3-D TRUS for intraoperative guidance during prostate cryoablation in 21 patients.
Main Results:
- 3-D TRUS provided a unique coronal view, facilitating accurate cryoprobe placement.
- Probe malalignment, undetectable by 2-D TRUS, was identified and corrected in all patients prior to cryosurgery.
- Post-procedure biopsies showed a low positive rate (2 of 44 cores) with a median follow-up of < 1 year.
Conclusions:
- 3-D TRUS is a valuable tool for prostate imaging, significantly enhancing guidance during cryoablation.
- This technology improves procedural accuracy by enabling early detection and correction of cryoprobe malalignment.