@article{oai:repo.qst.go.jp:00045810,
 author = {Serizawa, Itsuko and Imai, Reiko and Kamada, Tadashi and Tsuji, Hiroshi and Kishimoto, Riwa and Kandatsu, Susumu and Tsujii, Hirohiko and Tatezaki, Shinichiroh and 芹澤 慈子 and 今井 礼子 and 鎌田 正 and 辻 比呂志 and 岸本 理和 and 神立 進 and 辻井 博彦 and 舘崎 愼一郎},
 issue = {5},
 journal = {Journal of Computer Assisted Tomography},
 month = {Sep},
 note = {OBJECTIVE:: We evaluated changes in tumor volume in cases of sacral chordoma after carbon ion radiotherapy. METHODS:: Thirty-four patients with sacral chordoma underwent carbon ion radiotherapy between June 1996 and June 2003. We assessed 23 patients without previous surgery using T2-weighted magnetic resonance imaging. The tumor volume was calculated semiautomatically. RESULTS:: Two cases showed local recurrence. The median interval of this examination was 46 months. At the end of the treatment, the tumor showed an enlargement larger than 10% of its volume in 13 of the 23 cases, no change in 4 cases, and regression in 6 cases. At the last examination, 20 cases showed a reduction in tumor volume, and the median ratio, determined as the tumor volume at the last examination divided by that before the treatment, was 0.36. CONCLUSIONS:: An increase in tumor volume at the end of the treatment does not indicate the ineffectiveness of carbon ion radiotherapy.},
 pages = {795--798},
 title = {Changes in tumor volume of sacral chordoma after carbon ion radiotherapy},
 volume = {33},
 year = {2009}
}