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
505-509
,共5页
付庆国%朱小东%杨海明%魏党%刘志杰
付慶國%硃小東%楊海明%魏黨%劉誌傑
부경국%주소동%양해명%위당%류지걸
碳素纤维床%三维治疗计划%剂量分布%γ通过率
碳素纖維床%三維治療計劃%劑量分佈%γ通過率
탄소섬유상%삼유치료계화%제량분포%γ통과솔
Carbon fiber treatment couch%Three-dimensional treatment planning%Dose distribution%γ passing rate
目的 评估加速器碳素纤维床对放疗计划剂量分布及验证通过率的影响.方法 在Pinnacle8.0m计划系统中建立治疗床模型,修正10例鼻咽癌、10例宫颈癌和10例胸肺部放疗计划后斜入射野的剂量计算.评估碳素纤维床对放疗计划剂量分布的影响.利用三维验证设备Delta4实测放疗计划,比较在剂量计算中考虑进碳素纤维床后γ通过率的改进程度.结果 TPS剂量计算考虑治疗床后靶区所受剂量明显减少[(4772～7266) cGy:(4859～7347) cGy,P=0.000～0.002],D95的相对偏差为1％ ～3％.Delta4验证的γ通过率(3 mm/3％标准)均有所提高(96.4％～98.8 ％:93.4％～97.3％,P =0.000).结论 若TPS剂量计算时不考虑治疗床的存在则靶区所受剂量将被高估,这对靶区剂量响应梯度小的肿瘤更应引起足够重视.
目的 評估加速器碳素纖維床對放療計劃劑量分佈及驗證通過率的影響.方法 在Pinnacle8.0m計劃繫統中建立治療床模型,脩正10例鼻嚥癌、10例宮頸癌和10例胸肺部放療計劃後斜入射野的劑量計算.評估碳素纖維床對放療計劃劑量分佈的影響.利用三維驗證設備Delta4實測放療計劃,比較在劑量計算中攷慮進碳素纖維床後γ通過率的改進程度.結果 TPS劑量計算攷慮治療床後靶區所受劑量明顯減少[(4772～7266) cGy:(4859～7347) cGy,P=0.000～0.002],D95的相對偏差為1％ ～3％.Delta4驗證的γ通過率(3 mm/3％標準)均有所提高(96.4％～98.8 ％:93.4％～97.3％,P =0.000).結論 若TPS劑量計算時不攷慮治療床的存在則靶區所受劑量將被高估,這對靶區劑量響應梯度小的腫瘤更應引起足夠重視.
목적 평고가속기탄소섬유상대방료계화제량분포급험증통과솔적영향.방법 재Pinnacle8.0m계화계통중건립치료상모형,수정10례비인암、10례궁경암화10례흉폐부방료계화후사입사야적제량계산.평고탄소섬유상대방료계화제량분포적영향.이용삼유험증설비Delta4실측방료계화,비교재제량계산중고필진탄소섬유상후γ통과솔적개진정도.결과 TPS제량계산고필치료상후파구소수제량명현감소[(4772～7266) cGy:(4859～7347) cGy,P=0.000～0.002],D95적상대편차위1％ ～3％.Delta4험증적γ통과솔(3 mm/3％표준)균유소제고(96.4％～98.8 ％:93.4％～97.3％,P =0.000).결론 약TPS제량계산시불고필치료상적존재칙파구소수제량장피고고,저대파구제량향응제도소적종류경응인기족구중시.
Objective To evaluate the effect of carbon fiber couch on dose distribution of radiotherapy planning and verification pass rate.Methods Establishing the carbon fiber treatment couch model in Pinnacle8.0m Treatment Planning system (TPS),and then this model was used to correct dose calculations of oblique fields in the treatment plans of 10 cases of nasopharyngeal carcinoma,10 cases of breast cancer and 10 cases of lung cancer and evaluate the effect of carbon fiber couch on the whole dose distribution of the plans.Then these plans were measured by three-dimensional dose verification equipment Delta4 to confirm the improvement extent of Gamma pass rate after considering the carbon fiber treatment couch.Results For the majority of plans,when the carbon fiber couch was taken into consideration,the target doses was significantly reduced (4772 cGy-7266 cGy vs.4859 cGy-7347 cGy,P=0.000-0.002) and the relative deviation of D95 was 1％ to 3％.Measurement results of Delta4 showed that Gamma pass rate (3 mm/3％ criteria) increased in all plans (96.4％-98.8％ vs.93.4％-97.3％,P =0.000),some of that were up to 5 percentage when the couch model was applied.Conclusions Target doses will be overestimated if the treatment couch is ignored in TPS measurement.,However it should arouse enough attention when the disease with smaller doses corresponding gradient.
