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- W2392025101 abstract "Objective: To analyze the target motion during the mid-thoracic esophageal carcinoma radiotherapy and discuss the dosimetry change.Methods: Ten patients with primary middle thoracic esopheal carcinoma were selected retrospectively.The mean length of target was 11.7 cm.Each patient received two CT scanning and declining GTV1 and GTV2 during the radiotherapy.The two CT images were rigid deformed.Physicist designed plans both in GTV1 and GTV2 and campared the target motion and dosimetry variation.Results: The targets of new CT(GTV2) were significantly smaller than those of old CT(GTV1).On the same transverse the maximal difference of x-axis,y-axis was 4 mm and 2.3 mm.The avarage volume of GTV1 and GTV2 which achieved the prescription dose was 99.45%±0.73% and 97.19%±2.37% respctively.There were no statistical diffetence for the maximal dose,mean dose and the minimal dose of the target.The new plan for the mean dose of heart,left lung,total lung and the maximum dose of spinal-cord were smaller than those of the old plan with no significant dierrence.But there was statistically difference for the mean dose of right lung(t=3.172,P=0.025).Conclusions: The target volume change and anatomic position displacement of mid-thoracic esophageal carcinoma should not be neglected in clinics.These changes would cause underdose in target and overdose in normal tissue.Therefore,it is necessary to have another CT scanning and replan during the mid-thoracic esophageal carcinoma radiotherapy." @default.
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- W2392025101 date "2012-01-01" @default.
- W2392025101 modified "2023-09-25" @default.
- W2392025101 title "The Preliminary Study of Geometry Motion and Dosimetry Change for the Target of Midthoracic Esophageal Carcinoma Before and After New CT Scanning" @default.
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