Prostate brachytherapy seed reconstruction using c-arm rotation measurement and motion compensation

Authors:
Ehsan Dehghan;Junghoon Lee;Mehdi Moradi;Xu Wen;Gabor Fichtinger;Septimiu E. Salcudean
Affiliations:
Queen's University, Canada;Johns Hopkins University;University of British Columbia, Canada;University of British Columbia, Canada;Queen's University, Canada;University of British Columbia, Canada
Venue:
MICCAI'10 Proceedings of the 13th international conference on Medical image computing and computer-assisted intervention: Part I
Year:
2010

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Abstract

During prostate brachytherapy, C-arm flouroscopy images are used for a qualitative assessment of the procedure. Three dimensional reconstruction of the implanted seeds can be used for intraoperative dosimetry and quantitative assessment. Accurate C-arm pose estimation is necessary for 3D localization of the seeds. We propose to measure the C-arm rotation angles and computationally compensate the inevitable C-arm translational motion to estimate the pose. We compensate the oscillation, sagging and wheel motion of the C-arm using a three-level optimization algorithm, without which the reconstruction can fail. We validated our approach on simulated and 10 data sets from 5 patients and gained on average 99.1% success rate, 0.33mm projection error and computation time of less than one minute per patient, which are clinically excellent results.