@misc{oai:repo.qst.go.jp:00064240,
 author = {馬場, 雅行 and 蓑原, 伸一 and 土橋, 卓 and 森, 慎一郎 and 熊谷, 始紀 and 稲庭, 拓 and 中嶋, 美緒 and 山本, 直敬 and 須金, 紀雄 and 神立, 進 and 馬場 雅行 and 蓑原 伸一 and 土橋 卓 and 森 慎一郎 and 熊谷 始紀 and 稲庭 拓 and 中嶋 美緒 and 山本 直敬 and 須金 紀雄 and 神立 進},
 month = {Apr},
 note = {To study the range of intrafractional lung tumor motion
and evaluate how much they were reduced in the use of
immobilization, 10 patients of lung cancer fixed by an
immobilization device underwent four-dimensional
computed tomography (4DCT) for one cycle of
respiration in free-breathing condition. The respiratory
period was subdivided into 10 phases and
intrafractional tumor motions were evaluated by
identifying the center of mass of gross tumor volume
(GTV) for each respiratory phase.
The mean ranges of the tumor motion over 10 patients
were 1.4 mm, 2.2 mm and 6.6 mm in left-right (LR),
anterior-posterior (AP) and superior-inferior (SI)
directions, respectively. A previous work which studied
the lung tumor motion for freely breathing patients
without immobilization by using 4DCT have reported
that the movement averaged 1.9mm, 4.0mm and 10.3
mm in LR, AP and SI-directions, respectively. The
immobilization reduces the range of the lung tumor
motion by 0.5mm, 1.8mm and 3.7mm in each direction.
This result shows that immobilization is effective not
only for fixing patients to a couch, but also for reducing
intrafractional tumor motion., H20年度HIMAC共同利用研究成果発表会},
 title = {中心型肺癌に対する炭素イオン線治療における3次元治療計画の研究},
 year = {2009}
}