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Title: Detailed dosimetric evaluation of intensity-modulated radiation therapy plans created for stage C prostate cancer based on a planning protocol.
Authors: Norihisa, Yoshiki
Mizowaki, Takashi  kyouindb  KAKEN_id  orcid (unconfirmed)
Takayama, Kenji  kyouindb  KAKEN_id
Miyabe, Yuki  kyouindb  KAKEN_id
Matsugi, Kiyotomo
Matsuo, Yukinori  kyouindb  KAKEN_id  orcid (unconfirmed)
Narabayashi, Masaru  KAKEN_id
Sakanaka, Katsuyuki  kyouindb  KAKEN_id
Nakamura, Akira
Nagata, Yasushi
Hiraoka, Masahiro  KAKEN_id
Author's alias: 溝脇, 尚志
Keywords: Prostate cancer
Intensity-modulated radiation therapy (IMRT)
Radiation therapy treatment planning
Issue Date: Oct-2012
Publisher: Springer Japan
Journal title: International journal of clinical oncology
Volume: 17
Issue: 5
Start page: 505
End page: 511
Abstract: [Background]: Intensity-modulated radiation therapy (IMRT) has been employed as a precision radiation therapy with higher conformity to the target. Although clinical outcomes have been reported for many investigations, detailed treatment planning results have not been mentioned to date. The aim of this study was to evaluate the dose specifications of our IMRT treatment plans for locally advanced prostate cancer. [Methods]: Seventy-seven clinically applied IMRT plans treated between September 2003 and December 2005, in which patients were irradiated with 78 Gy in the prone position, were retrospectively analyzed. Dosimetric data output from dose volume histograms were evaluated in detail. [Results]: The mean dose ± standard deviation, homogeneity index, and conformity index to the planning target volume (PTV) were 78.3 ± 0.7 Gy (100.4 ± 0.9%), 13.7 ± 3.0, and 0.83 ± 0.04, respectively. For the clinical target volume, the mean dose was 80.3 ± 0.7 Gy (102.9 ± 0.9%).The V40, V60, and V70 Gy of the rectal wall were 58.3 ± 2.8, 29.6 ± 2.7, and 15.2 ± 3.0%, respectively. Planning difficulties were encountered in patients whose bowels were displaced downward, as constraints imposed by the bowel position altered the dose index of the PTV. In many cases, additional bowel optimization parameters were required to satisfy constraints for organs at risk. However, major deviation could be avoided by inverse planning with computer optimization. [Conclusion]: IMRT allowed the creation of acceptable and practical treatment plans for locally advanced prostate cancer. Reports regarding detailed dosimetric evaluations are mandatory for interpreting clinical outcomes in the future.
Rights: The final publication is available at
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1007/s10147-011-0324-1
PubMed ID: 21960356
Appears in Collections:Journal Articles

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