Evaluation of rectum and bladder dose accumulation from external beam radiotherapy and brachytherapy for cervical cancer using two different deformable image registration techniques

Noriyuki Kadoya, Yu Ya Miyasaka, Takaya Yamamoto, Yoshihiro Kuroda, Kengo Ito, Mizuki Chiba, Yujiro Nakajima, Noriyoshi Takahashi, Masaki Kubozono, Rei Umezawa, Suguru Dobashi, Ken Takeda, Keiichi Jingu

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We evaluated dose-volume histogram (DVH) parameters based on deformable image registration (DiR) between brachytherapy (BT) and external beam radiotherapy (EBRT) that included a center-shielded (CS) plan. Eleven cervical cancer patients were treated with BT, and their pelvic and CS EBRT were studied. Planning CT images for EBRT and BT (except for the first BT, used as the reference image) were deformed with DiR to reference image. We used two DiR parameter settings: Intensity-based and hybrid. Mean Dice similarity coefficients (DSCs) comparing EBRT with the reference for the uterus, rectum and bladder were 0.81, 0.77 and 0.83, respectively, for hybrid DiR and 0.47, 0.37 and 0.42, respectively, for intensity-based DiR (P < 0.05). D1 cm3 for hybrid DiR, intensity-based DiR and DVH addition were 75.1, 81.2 and 78.2 Gy, respectively, for the rectum, whereas they were 93.5, 92.3 and 94.3 Gy, respectively, for the bladder. D2cm3 for hybrid DiR, intensity-based DiR and DVH addition were 70.1, 74.0 and 71.4 Gy, respectively, for the rectum, whereas they were 85.4, 82.8 and 85.4 Gy, respectively, for the bladder. Overall, hybrid DiR obtained higher DSCs than intensity-based DiR, and there were moderate differences in DVH parameters between the two DiR methods, although the results varied among patients. DiR is only experimental, and extra care should be taken when comparing DiR-based dose values with dose-effect curves established using DVH addition. Also, a true evaluation of DiR-based dose accumulation would require ground truth data (e.g. measurement with physical phantom).

Original languageEnglish
Pages (from-to)720-728
Number of pages9
JournalJournal of radiation research
Volume58
Issue number5
DOIs
Publication statusPublished - 2017 Sep 1

Keywords

  • Radiotherapy
  • brachytherapy
  • cervical cancer
  • deformable image registration
  • dose accumulation

ASJC Scopus subject areas

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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