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Dosimetric effects of endorectal balloons on intensity-modulated radiation therapy plans for prostate cancer

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Abstract

We used an endorectal balloon (ERB) for prostate immobilization during intensity-modulated radiotherapy (IMRT) for prostate cancer treatment. To investigate the dosimetric effects of ERB-filling materials, we changed the ERB Hounsfield unit (HU) from 0 to 1000 HU in 200-HU intervals to simulate the various ERB fillings; 0 HU simulated a water-filled ERB, and 1000 HU simulated the densest material-filled ERB. Dosimetric data (coverage, homogeneity, conformity, maximal dose, and typical volume dose) for the tumor and the organs at risk (OARs) were evaluated in prostate IMRT treatment plans with 6-MV and 15-MV beams. The tumor coverage appeared to differ by approximately 1%, except for the clinical target volume (CTV) V100% and the planning target volume (PTV) V100%. The largest difference for the various ERB fillings was observed in the PTV V100%. In spite of increasing HU, the prostate IMRT plans at both energies had relatively low dosimetric effects on the PTV and the CTV. However, the maximal and the typical volume doses (D25%, D30%, and D50%) to the rectal wall and the bladder increased with increasing HU. For an air-filled ERB, the maximal doses to the rectal wall and the monitor units were lower than the corresponding values for the water-filled and the densest material-filled ERBs. An air-filled ERB spared the rectal wall because of its dosimetric effect. Thus, we conclude that the use of an air-filled ERB provides a dosimetric benefit to the rectal wall without a loss of target coverage and is an effective option for prostate IMRT treatment.

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Authors and Affiliations

  1. Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, 463-707, Korea

    Jae-Sung Kim, Jin-Beom Chung, In-Ah Kim & Keun-Yong Eom

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  1. Jae-Sung Kim
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  2. Jin-Beom Chung
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Correspondence to Jin-Beom Chung.

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Kim, JS., Chung, JB., Kim, IA. et al. Dosimetric effects of endorectal balloons on intensity-modulated radiation therapy plans for prostate cancer. Journal of the Korean Physical Society 63, 1637–1643 (2013). https://doi.org/10.3938/jkps.63.1637

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  • DOI: https://doi.org/10.3938/jkps.63.1637

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