直腸癌放射治療腹孔體板對應位置臨床分析

Clinical analysis of belly board position in rectal cancer radiotherapy

目的明確本中心設備技術條件下,直腸癌放療體位固定腹孔體板和患者椎體的建議對應位置。方法回顧性分析本中心2020年連續收治的直腸癌患者36例,比較腹孔體板和患者椎體不同對應位置的分佈情況,不同對應位置的小腸照射體積,劑量體積和患者急性消化道副作用,評估可否滿足小腸安全的劑量學要求,分析統計學差異。結果腹孔體板和患者椎體對應位置多位於L4-S1水平。腹孔體板對應L4下緣時,照射野内小腸體積最小,但缺乏統計學差異(P>0.05)。腹孔體板對應L4下緣至S1下緣,符合小腸安全的劑量體積要求,患者急性消化道副作用可耐受。結論本中心設備技術條件下,腹孔體板和患者椎體的對應位置建議在L4至S1下緣。

Objective Try to give a suggestion to belly board position concerning patient vertebrae for rectal cancer RT immobilization based on the equipment technical conditions in our center.Methods A retrospective analysis of 36 patients with rectal cancer admitted to our center in 2020,comparing the distribution of their belly board positions in relation to the patients'different vertebrates and the intestine irradiation-volume dose-volume and patients'acute gastrointestinal side effects.Evaluate whether it can meet the intestine dosimetry-safe criterion and analyze statistical differences.Results The belly board positions concerning patients'vertebrae were mainly at the L4-S1 level.When placed to the lower edge of L4,the small intestine volume in the irradiation field was the smallest,but there was no statistical difference(P>0.05).The belly board concerning L4-S1 lower edge,which met the intestine safe dose-volume criterion,and the patients'acute gastrointestinal side effects were tolerable.Conclusion In our center's equipment and technique condition,a belly board is suggested to be placed to L4-S1 lower edge in RT immobilization.