对7例颈及胸上段食管癌患者分别设计3、5、7野3种同步加量调强放疗的设野计划,比较3种计划间靶区和危及器官的剂量学差异。结果显示3野计划的靶区覆盖率、适形指数和均匀性指数明显劣于5野和7野。7野计划中双肺V5明显大于3野和5野。表明3野计划即可使颈及胸上段食管癌的治疗靶区得到足够的照射剂量,但均匀性及适形度差,5野计划可使靶区获得较为理想的剂量分布,可作为临床首选。%Seven cervical part and upper thoracic part esophageal carcinoma patients were respectively designed for 3 ,5 ,7 fields in simultaneous integrated boost intensity-modulated radiotherapy plans to compare the differences in target and organ at risk dose. Results revealed that the target area dose coverage,conformity index and homogeneity index in 3 fields plans were inferior to 5 fields and 7 fields plans. Moreover, the both lung V5 in 7 fields plan was greater than 5 fields and 3 fields plans. The target area could receive sufficient dose in 3 fields plan, but the uni-formity and conformity were unsatisfied. 5 fields plan made the target area receive ideal dose distribution, which showed 5 fields plan was the first choice in clinic.
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