Journal of Medical Physics
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ORIGINAL ARTICLE
Year : 2006  |  Volume : 31  |  Issue : 2  |  Page : 61-66

Intra-operative dosimetry of trans-rectal ultrasound guided 125I prostate implants using C-arm fluoroscopic images


1 Department of Radiation Oncology, Christian Medical College & Hospital, Vellore, Tamil Nadu, India
2 London Regional Cancer Program, London Health Sciences Centre and the University of Western Ontario, London, Ontario, Canada

Correspondence Address:
Paul B Ravindran
Department of Radiation Oncology, Christian Medical College and Hospital, Vellore-632 004, Tamil Nadu, India

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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0971-6203.26689

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Permanent implantation of radioactive seeds is a viable and effective therapeutic option widely used today for early-stage prostate cancer. The implant technique has improved considerably during the recent years due to the use of image guidance; however, real-time dose distributions would allow potential cold spots to be assessed and additional seeds added. In this study, we investigate the use of a conventional C-arm fluoroscopy unit for image acquisition and evaluation of dose distribution immediately after the implant. The phantom study indicates that it is possible to obtain seed positions within 2 mm. A pilot study carried out with three patients indicated that it is possible to obtain seed positions and calculate the dose distribution with C-arm fluoroscopy and about 95% of the seeds were reconstructed within 2 mm. The results could be further improved with better digital imaging.


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