Daily organ tracking in intensity-modulated radiotherapy of prostate cancer using an electronic portal imaging device with a dose saving acquisition mode

Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology
D VetterliD M Aebersold

Abstract

Daily use of conventional electronic portal imaging devices (EPID) for organ tracking is limited due to the relatively high dose required for high quality image acquisition. We studied the use of a novel dose saving acquisition mode (RadMode) allowing to take images with one monitor unit per image in prostate cancer patients undergoing intensity-modulated radiotherapy (IMRT) and tracking of implanted fiducial gold markers. Twenty five patients underwent implantation of three fiducial gold markers prior to the planning CT. Before each treatment of a course of 37 fractions, orthogonal localization images from the antero-posterior and from the lateral direction were acquired. Portal images of both the setup procedure and the five IMRT treatment beams were analyzed. On average, four localization images were needed for a correct patient setup, resulting in four monitor units extra dose per fraction. The mean extra dose delivered to the patient was thereby increased by 1.2%. The procedure was precise enough to reduce the mean displacements prior to treatment to < o =0.3 mm. The use of a new dose saving acquisition mode enables to perform daily EPID-based prostate tracking with a cumulative extra dose of below 1 Gy. This concept is ef...Continue Reading

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Citations

Dec 8, 2010·Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]·Pirus GhadjarDaniel M Aebersold
Sep 18, 2010·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Vickie KongTara Rosewall
Jan 27, 2009·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Pirus GhadjarDaniel M Aebersold
Dec 18, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Dirk VerellenGuy Storme
Nov 21, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Cornelia WalterFrederik Wenz
Jun 1, 2010·International Journal of Radiation Oncology, Biology, Physics·Richard B WilderKenneth M Tokita
Nov 21, 2007·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Dag R Olsen, David I Thwaites
Sep 7, 2014·International Journal of Clinical Oncology·Arash O NaghaviRichard B Wilder
Apr 22, 2014·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Tobin J StromMatthew C Biagioli
Nov 21, 2008·Journal of Applied Clinical Medical Physics·Christopher NelsonGeorge Starkschall
Jul 23, 2015·International Braz J Urol : Official Journal of the Brazilian Society of Urology·George YangMatthew C Biagioli
Sep 25, 2014·International Braz J Urol : Official Journal of the Brazilian Society of Urology·Tobin J StromRichard B Wilder
Mar 21, 2020·Radiological Physics and Technology·Radwa FawzyAhmed Seleem

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