中华放射肿瘤学杂志
中華放射腫瘤學雜誌
중화방사종류학잡지
CHINESE JOURNAL OF RADIATION ONCOLOGY
2014年
6期
513-515
,共3页
孙晓欢%谭丽娜%马奎%肖锋
孫曉歡%譚麗娜%馬奎%肖鋒
손효환%담려나%마규%초봉
容积调强弧形疗法%摆位误差%剂量学验证
容積調彊弧形療法%襬位誤差%劑量學驗證
용적조강호형요법%파위오차%제량학험증
Volumetric modulated arc therapy%Setup error%Dosimetric verification
目的 探讨鼻咽癌患者及宫颈癌患者VMAT中摆位误差对剂量学验证的影响.方法 分别为10例鼻咽癌、宫颈癌患者设计VMAT计划,并将计划移植到Delta4模体中进行计算,在瓦里安iX加速器上实施照射,通过移动治疗床模拟左、右、头、脚、腹、背方向上3、5、7 mm摆位误差,从而验证摆位误差对剂量验证通过率的影响.结果 γ分析结果显示鼻咽癌患者摆位误差＞3mm时,3％/3 mm标准下的通过率均＜90％,摆位误差达到5 mm时,头方向低至(64.7±8.2)％;宫颈癌患者摆位误差＞5mm时3％/3 mm标准下的通过率均＜90％,摆位误差达到7 mm时,头方向低至(63.3±3.6)％.结论 摆位误差对鼻咽癌患者和宫颈癌患者的VMAT计划的剂量学验证有较大影响,误差越大通过率越低,尤其是头方向误差对剂量分布影响更为显著.
目的 探討鼻嚥癌患者及宮頸癌患者VMAT中襬位誤差對劑量學驗證的影響.方法 分彆為10例鼻嚥癌、宮頸癌患者設計VMAT計劃,併將計劃移植到Delta4模體中進行計算,在瓦裏安iX加速器上實施照射,通過移動治療床模擬左、右、頭、腳、腹、揹方嚮上3、5、7 mm襬位誤差,從而驗證襬位誤差對劑量驗證通過率的影響.結果 γ分析結果顯示鼻嚥癌患者襬位誤差＞3mm時,3％/3 mm標準下的通過率均＜90％,襬位誤差達到5 mm時,頭方嚮低至(64.7±8.2)％;宮頸癌患者襬位誤差＞5mm時3％/3 mm標準下的通過率均＜90％,襬位誤差達到7 mm時,頭方嚮低至(63.3±3.6)％.結論 襬位誤差對鼻嚥癌患者和宮頸癌患者的VMAT計劃的劑量學驗證有較大影響,誤差越大通過率越低,尤其是頭方嚮誤差對劑量分佈影響更為顯著.
목적 탐토비인암환자급궁경암환자VMAT중파위오차대제량학험증적영향.방법 분별위10례비인암、궁경암환자설계VMAT계화,병장계화이식도Delta4모체중진행계산,재와리안iX가속기상실시조사,통과이동치료상모의좌、우、두、각、복、배방향상3、5、7 mm파위오차,종이험증파위오차대제량험증통과솔적영향.결과 γ분석결과현시비인암환자파위오차＞3mm시,3％/3 mm표준하적통과솔균＜90％,파위오차체도5 mm시,두방향저지(64.7±8.2)％;궁경암환자파위오차＞5mm시3％/3 mm표준하적통과솔균＜90％,파위오차체도7 mm시,두방향저지(63.3±3.6)％.결론 파위오차대비인암환자화궁경암환자적VMAT계화적제량학험증유교대영향,오차월대통과솔월저,우기시두방향오차대제량분포영향경위현저.
Objective To evaluate the effect of the setup error on the dosimetric verification for the nasopharyngeal carcinoma patients and cervical carcinoma patients treated with volumetric modulated are therapy (VMAT).Methods VMAT plans for 10 cervical cancer patients and 10 nasopharyngeal carcinoma patients were transplanted into the Delta4 phantom and calculate the dose,next,implement the treatment on the Varian iX linear accelerator.on the Varian iX linear accelerator.To simulate the setup error by moving the treatment couch in,out,up,down,left,right by 3 mm,5 mm,7 mm.Thereby study the effect of the setup error on the pass rate of the dose verification.Results The results for the dose distribution using the gamma evaluation method showed that the pass rate (3％/3 mm) was less than 90％ when the setup error were greater than 3 mm and 5 mm for the nasopharyngeal carcinoma patients and the cervical carcinoma patients.The pass rate of head direction were (64.7 ± 8.2) ％ and (63.3 ± 3.6) ％ on setup error of 5 mm and 7 mm for nasopharyngeal carcinoma patients and cervical carcinoma patients,respectively.Conclusions Setup error has great effect on the dose verification of the VMAT plans,the greater of the setup error,the lower of the pass rate.The setup error of head direction is more sensitive than other directions especially.
