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Variation of clinical target volume definition among Japanese radiation oncologists in external beam radiotherapy for prostate cancer |
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| Authors: | Nakamura Katsumasa Shioyama Yoshiyuki Tokumaru Sunao Hayashi Nobuyuki Oya Natsuo Hiraki Yoshiyuki Kusuhara Kazuo Toita Takafumi Suefuji Hiroaki Hayabuchi Naofumi Terashima Hiromi Makino Masaoki Jingu Kenichi |
| Affiliation: | 1 Department of Radiology, School of Medicine, Fukuoka University, Fukuoka 2 Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 3 Department of Radiology, Faculty of Medicine, Saga University, Saga 4 Department of Radiology, Nagasaki University School of Medicine, Nagasaki 5 Department of Radiation Oncology, Kumamoto University Hospital, Kumamoto 6 Department of Radiology, Kagoshima University School of Medicine, Kagoshima 7 Department of Radiology, Miyazaki Medical College, Miyazaki 8 Department of Radiology, Graduate School of Medical Science, University of the Ryukyus, Okinawa 9 Department of Radiology, Kurume University School of Medicine, Kurume, Fukuoka 10 Department of Health Sciences, School of Medicine, Kyushu University, Fukuoka 11 Department of Radiology, National Hospital Organization Kagoshima Medical Center, Kagoshima 12 Division of Radiation Oncology, St. Mary's Hospital, Fukuoka, Japan |
| Abstract: | Background: We investigated the interobserver variation in the prostatetarget volume and the trend toward the use of diagnostic computedtomography (CT) or magnetic resonance (MR) images for treatmentplanning. Methods: Twenty-five radiation oncologists were asked to draw the externalcontour of the prostate on CT images (0.3 cm spacing) of a patientwith localized prostate cancer. They also answered a questionnaireregarding the use of diagnostic CT or MR images for the contouring. Results: Of the 25 physicians, 28% rarely or never referred to the diagnosticCT images. In contrast, the physicians tended to refer to theMR images more frequently. Approximately 50% of the physiciansbelieved in the usefulness of contrast-enhanced images for thedelineation of the prostate. As for the variation of the prostatecontouring, the median craniocaudal prostate length was 36 mm(range, 21–54 mm), and the median prostate volume was43.5 cm3 (range, 23.8–98.3 cm3). The interobserver variabilitywas not significant in the duration as a radiation oncologist,the board certification status as radiation oncologists, andthe number of treatment plans developed for prostate cancerduring the last 1 year. Conclusion: A wide variety of the definitions of the prostate was foundamong Japanese radiation oncologists. |
| Keywords: | radiation oncology urologic-RadOncol radiology-CT/MRI |
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