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Proceedings Paper

Quantification of prostate deformation due to needle insertion during TRUS-guided biopsy: comparison of hand-held and mechanically stabilized systems
Author(s): Tharindu De Silva; Jeffrey Bax; Aaron Fenster; Jagath Samarabandu; Aaron D. Ward
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Paper Abstract

Prostate biopsy is the clinical standard for the definitive diagnosis of prostate cancer. To overcome the limitations of 2D TRUS-guided biopsy systems when targeting pre-planned locations, systems have been developed with 3D guidance to improve the accuracy of cancer detection. Prostate deformation due to needle insertion and biopsy gun firing is a potential source of error that can cause target misalignments during biopsies. We use non-rigid registration of 2D TRUS images to quantify the deformation during the needle insertion and the biopsy gun firing procedure, and compare this effect in biopsies performed using a handheld TRUS probe with those performed using a mechanically assisted 3D TRUS guided biopsy system. Although the mechanically assisted biopsy system had a mean deformation approximately 0.2 mm greater than that of the handheld approach, it yielded a lower relative increase of deformation near the needle axis during the needle insertion stage and greater deformational stability of the prostate during the biopsy gun firing stage. We also analyzed the axial and lateral components of the tissue motion; our results indicated that the motion is weakly biased in the direction orthogonal to the needle, which is less than ideal from a targeting standpoint given the long, narrow cylindrical shape of the biopsy core.

Paper Details

Date Published: 26 March 2011
PDF: 6 pages
Proc. SPIE 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy, 79680U (26 March 2011); doi: 10.1117/12.878359
Show Author Affiliations
Tharindu De Silva, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
Jeffrey Bax, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
Aaron Fenster, Robarts Research Institute (Canada)
The Univ. of Western Ontario (Canada)
Jagath Samarabandu, The Univ. of Western Ontario (Canada)
Aaron D. Ward, Robarts Research Institute (Canada)


Published in SPIE Proceedings Vol. 7968:
Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Marvin M. Doyley, Editor(s)

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