Gopal Varma1, Peter Acher2, Graeme Penney1, Kawal Rhode1, Stephen Keevil1,3, Tobias Schaeffter1
1Imaging Sciences, King's College London, London, United Kingdom; 2Department of Urology, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom; 3Medical Physics, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom
Treatment by prostate brachytherapy involves implant of radioactive seeds. Dosimetry requires seed position and number to be accurately defined relative to prostate anatomy. The advantage of soft tissue contrast from MRI allows depiction of the prostate but localization of the seeds is relatively poor. A SGM technique is used to visualize the seeds by post-processing. The derived parameter is found to have a linear correlation with number of seeds and thus provides potential for dosimetry by MR.