肿瘤研究与临床
腫瘤研究與臨床
종류연구여림상
CANCER RESEARCH AND CLINIC
2011年
6期
388-389,392
,共3页
邢晓汾%郭瑞嵩%臧志芳%王鹤皋%靳宏星
邢曉汾%郭瑞嵩%臧誌芳%王鶴皋%靳宏星
형효분%곽서숭%장지방%왕학고%근굉성
子宫颈肿瘤%放射疗法%放射治疗计划,计算机辅助%摆位误差
子宮頸腫瘤%放射療法%放射治療計劃,計算機輔助%襬位誤差
자궁경종류%방사요법%방사치료계화,계산궤보조%파위오차
Uterine cervical neoplasms%Radiotherapy%Radiotherapy planning,computer-assisted%Set-up error
目的 研究子宫颈癌俯卧位调强放射治疗的摆位误差大小,为子宫颈癌调强放疗计划设计临床靶区体积(CTV)外放计划靶区体积(PTV)时提供参考数据.方法 选取行俯卧位调强放射治疗的子宫颈癌患者6例,所有病例治疗时身下垫有孔泡沫板,热塑成形固定膜固定.连续5 d治疗时用电子射野影像装置(EPID)拍射正侧位验证片各1张,共60张验证片,通过配准数字化重建图像(DRR)和EPID拍摄的验证片的骨性解剖结构,计算平移和旋转误差.结果 平移误差:左右方向为(3.1±1.8)mm、头脚方向为(3.9±3.3)mm、腹背方向为(4.2±2.6)mm;旋转误差冠状面为(0.8±0.9)°、矢状面为(1.2±1)°.结论 对于子宫颈癌俯卧位调强放射治疗,CTV到PTV的外放应为左右7.1mm、腹背10.8mm、头脚10.4 mm,在患者身体上做摆位的标记线有助于减少摆位误差.
目的 研究子宮頸癌俯臥位調彊放射治療的襬位誤差大小,為子宮頸癌調彊放療計劃設計臨床靶區體積(CTV)外放計劃靶區體積(PTV)時提供參攷數據.方法 選取行俯臥位調彊放射治療的子宮頸癌患者6例,所有病例治療時身下墊有孔泡沫闆,熱塑成形固定膜固定.連續5 d治療時用電子射野影像裝置(EPID)拍射正側位驗證片各1張,共60張驗證片,通過配準數字化重建圖像(DRR)和EPID拍攝的驗證片的骨性解剖結構,計算平移和鏇轉誤差.結果 平移誤差:左右方嚮為(3.1±1.8)mm、頭腳方嚮為(3.9±3.3)mm、腹揹方嚮為(4.2±2.6)mm;鏇轉誤差冠狀麵為(0.8±0.9)°、矢狀麵為(1.2±1)°.結論 對于子宮頸癌俯臥位調彊放射治療,CTV到PTV的外放應為左右7.1mm、腹揹10.8mm、頭腳10.4 mm,在患者身體上做襬位的標記線有助于減少襬位誤差.
목적 연구자궁경암부와위조강방사치료적파위오차대소,위자궁경암조강방료계화설계림상파구체적(CTV)외방계화파구체적(PTV)시제공삼고수거.방법 선취행부와위조강방사치료적자궁경암환자6례,소유병례치료시신하점유공포말판,열소성형고정막고정.련속5 d치료시용전자사야영상장치(EPID)박사정측위험증편각1장,공60장험증편,통과배준수자화중건도상(DRR)화EPID박섭적험증편적골성해부결구,계산평이화선전오차.결과 평이오차:좌우방향위(3.1±1.8)mm、두각방향위(3.9±3.3)mm、복배방향위(4.2±2.6)mm;선전오차관상면위(0.8±0.9)°、시상면위(1.2±1)°.결론 대우자궁경암부와위조강방사치료,CTV도PTV적외방응위좌우7.1mm、복배10.8mm、두각10.4 mm,재환자신체상주파위적표기선유조우감소파위오차.
Objective To study the spatial distribution of set-up errors for cervical cancer with intensity modulated radiation therapy (IMRT) and to provide referential safety margin out of clinical tumor volume (CTV) during treatment plan design. Methods Six patients with cervical cancer were treated with IMRT in prone position, belly board and thermoplastic cast was used for immobilization. Measurement were made on a daily basis setup under five consecutive treatments with electron portal images device (EPID).Portal films from two projection (one anter-posterior and one opposite lateral)were taken. Sixty portal films were analyzed. The translational and rotational deviations were analyzed by registering and comparing the bony structures of EPID and digitally reconstructed radiographs (DRR). Results The translational deviations were (3.1 ±1.8) mm, (3.9 ±3.3) mm, (4.2 ±2.6) mm in medi-lateral, cranio-caudal and anterior-posterior directions, the rotational deviations were in coronal plane (0.8±0.9)° and sagittal plane (1.2±1)°. Conclusion For the patients with cervical cancer undergoing IMRT, the margins between the CTV and PTV should be 7.1 mm in lateral direction, 10.4 mm in cranio-caudal and 10.8 mm in anterior-posterior directions. The sign on patients body can help to reduce the setup errors.
