中国继续医学教育
中國繼續醫學教育
중국계속의학교육
China Continuing Medical Education
2015年
23期
116-117
,共2页
千伏级锥形束%胸中段食道癌%摆位误差%真空垫%体膜
韆伏級錐形束%胸中段食道癌%襬位誤差%真空墊%體膜
천복급추형속%흉중단식도암%파위오차%진공점%체막
KV-CBCT%Thoracic esophageal carcinoma%Setup error%Vacuum pad%Membrane
目的 应用千伏级锥形束CT(KV-CBCT)比较胸中段食道癌患者使用真空垫与体膜加真空垫两种固定技术的摆位误差.方法 选取40例患者随机分为两组,各20例.一组使用真空垫固定技术,另一组使用体膜加真空垫固定技术.应用KV-CBCT于放疗实施前对40例胸中段食道癌患者进行扫描,并在线将重建的三维图像与计划CT扫描图像匹配,获得左右(X)腹背(Y)头脚(Z)三个方向摆位误差并进行分析.结果 根据Van Herk公式(PTV=2.5 ∑+0.7 δ)计算得到各方向的CTV-PTV外放边界值,热塑体膜加真空垫固定组左右(X)、腹背(Y)、头脚(Z)分别1.60 mm、1.27 mm 、1.74 mm,真空垫固定组左右(X)、腹背(Y)、头脚(Z)分别2.47 mm、4.07 mm 、3.67 mm.结论 胸部肿瘤患者由于呼吸动度、胸廓变化、手臂上举牵拉等因素造成摆位误差,使用体膜加真空垫固定技术可减少摆位误差,从而提高摆位治疗精度.
目的 應用韆伏級錐形束CT(KV-CBCT)比較胸中段食道癌患者使用真空墊與體膜加真空墊兩種固定技術的襬位誤差.方法 選取40例患者隨機分為兩組,各20例.一組使用真空墊固定技術,另一組使用體膜加真空墊固定技術.應用KV-CBCT于放療實施前對40例胸中段食道癌患者進行掃描,併在線將重建的三維圖像與計劃CT掃描圖像匹配,穫得左右(X)腹揹(Y)頭腳(Z)三箇方嚮襬位誤差併進行分析.結果 根據Van Herk公式(PTV=2.5 ∑+0.7 δ)計算得到各方嚮的CTV-PTV外放邊界值,熱塑體膜加真空墊固定組左右(X)、腹揹(Y)、頭腳(Z)分彆1.60 mm、1.27 mm 、1.74 mm,真空墊固定組左右(X)、腹揹(Y)、頭腳(Z)分彆2.47 mm、4.07 mm 、3.67 mm.結論 胸部腫瘤患者由于呼吸動度、胸廓變化、手臂上舉牽拉等因素造成襬位誤差,使用體膜加真空墊固定技術可減少襬位誤差,從而提高襬位治療精度.
목적 응용천복급추형속CT(KV-CBCT)비교흉중단식도암환자사용진공점여체막가진공점량충고정기술적파위오차.방법 선취40례환자수궤분위량조,각20례.일조사용진공점고정기술,령일조사용체막가진공점고정기술.응용KV-CBCT우방료실시전대40례흉중단식도암환자진행소묘,병재선장중건적삼유도상여계화CT소묘도상필배,획득좌우(X)복배(Y)두각(Z)삼개방향파위오차병진행분석.결과 근거Van Herk공식(PTV=2.5 ∑+0.7 δ)계산득도각방향적CTV-PTV외방변계치,열소체막가진공점고정조좌우(X)、복배(Y)、두각(Z)분별1.60 mm、1.27 mm 、1.74 mm,진공점고정조좌우(X)、복배(Y)、두각(Z)분별2.47 mm、4.07 mm 、3.67 mm.결론 흉부종류환자유우호흡동도、흉곽변화、수비상거견랍등인소조성파위오차,사용체막가진공점고정기술가감소파위오차,종이제고파위치료정도.
Objective To evaluate setup errors using kilovoltage cone beam computed tomograph ( KV-CBCT ) for thoracic esophageal carcinoma patients treated by the ifxed technology of using vacuum pad and membrane plus vacuum pad.Methods Retrospective study has been carried out for 40 patients, which were separated into two groups. A group of 20 patients were ifxed with vacuum pad; another group of 20 patients were ifxed with the membrane plus vacuum pad. Before radiotherapy, 40 patients of thoracic esophageal carcinoma were scanned by KV-CBCT, and the reconstructed 3 D images and plan CT scan image were matched online, and then get and analyze the setup errors of three directions of left-right ( X ), ventral-dorsal ( Y ), cranial-caudal ( Z ).Results The margins required for CTV-PTV were calculated according to the Van Herk formula ( PTV=2.5 ∑+0.7 δ), The thermoplastic membrane plus vacuum pad ifxed groups of left-right ( X ), ventral-dorsal ( Y ), cranial-caudal ( Z ) respectively 1.60 mm, 1.27 mm, 1.74 mm; Fixed vacuum pad group of left-right ( X ), ventral-dorsal ( Y ), cranial-caudal ( Z ) were 2.47 mm, 4.07 mm, 3.67 mm.Conclusions The thoracic esophageal carcinoma patients due to respiratory movements, thoracic changes, and arm lift factors caused setup errors, using membrane plus fixed vacuum pad technology can reduce the setup errors, so as to improve the setup accuracy of therapy.
