3D geometric gel dosimetry verification of intraprostatic fiducial guided hypofractionated radiotherapy of prostate cancer

Fredrik Nordström, Sofie Ceberg, Sacha af Wetterstedt, Per Nilsson, Crister Ceberg, Sven Bäck

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

This pre-study is aimed to investigate the feasibility of a normoxic polyacrylamide gel (nPAG) dosimeter with implanted gold fiducials to evaluate the geometric precision, including setup correction strategies, in the delivery of hypofractionated treatments. For this purpose a phantom consisting of three parts was constructed: (1) the patient simulating volume, providing realistic scatter conditions and weight, (2) a bottle containing the active dosimetric volume and (3) the gold fiducials and the fiducial support structure. A 6.1 Gy prostate IMRT treatment was delivered to the phantom using the sliding-window technique. The phantom was positioned prior to the treatment using the implanted fiducials and kV on-board imaging. An overlay of the 95% isosurface of the TPS calculated dose distribution and the measured dose distribution using gel showed good agreement. The clinical target volume (CTV) was well centred inside the 95% isodose surface of the measured volume. It was shown for the evaluated case that the use of on-board imaging and integrated setup correction tools could be used to compensate for a deliberately introduced offset in CTV position. The study showed that MRI based nPAG gel dosimetry can be used to verify setup correction procedures using implanted gold fiducials.
Original languageEnglish
Title of host publicationJournal of Physics: Conference Series
PublisherIOP Publishing
Volume250
DOIs
Publication statusPublished - 2010
EventIC3DDose: The 6th International Conference on 3D Radiation Dosimetry - Hilton Head Island, South Carolina, United States
Duration: 2010 Aug 22 → …

Publication series

Name
Volume250

Conference

ConferenceIC3DDose: The 6th International Conference on 3D Radiation Dosimetry
Country/TerritoryUnited States
CityHilton Head Island, South Carolina
Period2010/08/22 → …

Subject classification (UKÄ)

  • Radiology, Nuclear Medicine and Medical Imaging

Free keywords

  • 3D verification
  • radiotherapy
  • polymer gel

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