Variation of clinical target volume definition among japanese radiation oncologists in external beam radiotherapy for prostate cancer

Katsumasa Nakamura, Yoshiyuki Shioyama, Sunao Tokumaru, Nobuyuki Hayashi, Natsuo Oya, Yoshiyuki Hiraki, Kazuo Kusuhara, Takafumi Toita, Hiroaki Suefuji, Naofumi Hayabuchi, Hiromi Terashima, Masaoki Makino, Kenichi Jingu

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Background: We investigated the interobserver variation in the prostate target volume and the trend toward the use of diagnostic computed tomography (CT) or magnetic resonance (MR) images for treatment planning. Methods: Twenty-five radiation oncologists were asked to draw the external contour of the prostate on CT images (0.3 cm spacing) of a patient with localized prostate cancer. They also answered a questionnaire regarding the use of diagnostic CT or MR images for the contouring. Results: Of the 25 physicians, 28% rarely or never referred to the diagnostic CT images. In contrast, the physicians tended to refer to the MR images more frequently. Approximately 50% of the physicians believed in the usefulness of contrast-enhanced images for the delineation of the prostate. As for the variation of the prostate contouring, the median craniocaudal prostate length was 36 mm (range, 21-54 mm), and the median prostate volume was 43.5 cm3 (range, 23.8-98.3 cm3). The interobserver variability was not significant in the duration as a radiation oncologist, the board certification status as radiation oncologists, and the number of treatment plans developed for prostate cancer during the last 1 year. Conclusion: A wide variety of the definitions of the prostate was found among Japanese radiation oncologists.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalJapanese journal of clinical oncology
Volume38
Issue number4
DOIs
Publication statusPublished - Apr 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research

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