摘要
目的比较胸中段食管癌5野适形放疗(5CRT)和5野调强放疗(5IMRT)靶区剂量及正常组织剂量。方法10例胸中段食管癌患者,每个患者设计1个5CRT计划和3个5IMRT计划,比较各个计划的各指标。结果各个计划脊髓最大剂量(Dmax)、全肺平均剂量(Dmean)、左肺Dmean以及右肺V25、V30差异无统计学意义(均P〉0.05);心脏V30、V40和Dmean差异有统计学意义(P〈0.05),以5IMRT2(28.67±15.97、13.04±7.28、2097.76±718.26)和5IMRT3(27.39±14.96、13.00±7.32、2096.16±718.85)最低,5CRT(43.27±18.69、26.83±19.18、2393.48±896.12)和5IMRT1(41.81±17.16、23.08±11.17、2403.77±834.73)最高。左肺V5、V10、V15、V20、V25和V30差异有统计学意义(P〈0.05),所有IMRT计划降低了V20、V25和V305IMRT1降低了V15(20.86±5.16),未增加V5和V10(54.39±7.58、44.76±6.30),5IMRT2(70.89±7.95、50.94±8.71、34.20±6.62)和5IMRT3(70.26±7.94、49.80±7.62、34.60±5.40)增加了V5、V10和V15.右肺V5、V10、V15、V20和Dmean差异有统计学意义(P〈0.05),所有IMRT计划降低了V20,增加了V5、V10,5IMRT1未增加V15(23.67±5.73)和Dmean(923.49±182.34),5IMRT2未增加V15(26.72±6.79),但增加了Dmean(1060.34±205.02),5IMRT3增加了V15(32.40±6.59)和Dmean(1100.54±197.84)。计划靶体积(PTV)的Dmean、均匀性指数(HI)和适形度指数(CI)差异均有统计学意义(均P〈0.05),PTV的Dmean以5IMRT1为最优(6219.80±37.90),5IMRT3次之(6268.91±56.26),HI以5IMRT1(0.0870±0.0219)和5IMRT3(0.0990±O.0219)最优,CI以5IMRT2(0.8682±0.0172)和5IMRT3(0.8667±0.0183)最优。结论5IMRT较5CRT在靶区均匀性、适形性及肺组织(V20、25和V30)的保护方面更具优势,5IMRT1在肺低剂量保护(V5、V10、V15和Dmean)更有优势。
Objective To compare the difference of dosimetric results between 3-dimensional eonformal radiotherapy (3D-CRT) and intensity-modulated radiotherapy (IMRT) with 5-field for thoracic middle esophageal carcinoma. Methods Ten patients with thoracic middle esophageal carcinoma were involved in this study. Four treatment plans were designed for each patient, including one 3D-CRT plan and three IMRT plans with 5-field and all evaluation contents were compared. Results There were no significant differences of cord Dmax, total-lung mean dose (Dmean), L-lung Dmean and R-lung V25, V30, Significant differences of heart V30, V40 and Dmean, were obtained among the plans, with the lowest of 5IMRT2 (V30: 28.67±15.97, V40: 13.04±7.28, Dmean: 2097.76±718.26) and 5IMRT3(27.39±14.96, 13.00±7.32, 2096.16±718.85), the highest of 5CRT (43.27± 18.69, 26.83±19.18, 2393.48±896.12) and 5IMRTI (41.81±17.16, 23.08±11.17, 2403.77±834.73). There Were significant differences of L-lung V5, V10, V15, V20, V25 and V30. All IMRT plans reduce V20, V25 and V30. 5IMRT1 did not increase V5 (54.39±7.58) and V10 (44.76±6.30), but redueesd V15 (20.86±5.16), 5IMRT2 (V5: 70.89± 7.95, V10: 50.94±8.71, V15: 34.20±6.62) and 5IMRT3 (V5: 70.26±7.94, V10: 49.80±7.62, V15: 34.60±5.40) increased V5, V10 and V15. There were also significant differences of R-lung V5, V10, V15, V20 and D All IMRT plans reduced V20, but increased V5 and V10. 5IMRT1 did not increase V15 (23.67±5.73) and Dmean (923.49±182.34); 5IMRT2 did not increases V15 (26.72±6.79) but increases Dmean (1060.34±205.02); 5IMRT3 increased both V15 (32.40±6.59) and Dmean (1100.54±197.84). Significant differences were found in Dmean, homogeneity index (HI) and conformity index (CI) of PTV, with the best Dmean of 5IMRT1 (6219.80±37.90), the second of 5IMRT3 (6268.91±56.26); the best HI of 5IMRT1 (0.0870±0.0219) and 5IMRT3 (0.0990±0.0219);the best CI of 5IRT2 (0.8682±0.0172) and 5IMRT3 (0.8667±0.0183). Conclusion 5-field IMRT plans have the advantages in the treatment of thoracic middle esophageal carcinoma with better HI, CI of target volume and sparing of lung (V20, Vmax and V30) compared to 3D-CRT. 5IMRT1 plan has the advantages in reducing low-dose volume (V5, V10, V15 and Dmena) of lung.
出处
《肿瘤研究与临床》
CAS
2011年第11期752-755,共4页
Cancer Research and Clinic
关键词
食管肿瘤
放射疗法
调强适形
放射治疗剂量
Esophageal neoplasms
Radiotherapy, intensity-modulated
Radiotherapy dosage