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| Comparison of dose distribution between 3DCRT and IMRT in middle thoracic and under thoracic esophageal carcinom |
| LI Ding-jie, LIU Hai-long, MAO Rong-hu, et al |
| Department of Radiation Oncolog, henan tumor hospital, Zhengzhou 450008 China |
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Abstract Objective To compare the dose distribution between three-dimensional conformal radiotherapy (3DCRT) and intensity-modulated radiotherapy (IMRT) in treating esophageal carcinoma (middle thoracic section and under thoracic section) and to select reasonable treatment methods for esophagus cancer. Methods Ten cases with cancer of the middle thoracic section and under thoracic section esophagus were chosen for a retrospective treatment-planning study. 3DCRT and IMRT plans were created for each patient:Some critical indicators were envolved in evaluing the treatment plans of IMRT (5B and 7B) and 3DCRT (3B), such as, PTV coverage and dose-volumes to irradiated normal structures. Evaluation indicators:prescription of 50Gy. total lung volume(V5,V10,V20),mean lung dose(MLD),spinal cord(Dmax),heart (V40) and conformality index(CI). Each plan was evaluated with respect to dose distribution, dose-volume histograms (DVHs), and additional dosimetric endpoints described below. Results There is no significance of CRT and IMRT technique in protection of total lung volume,mean lung dose,spinal cord(Dmax),target,CI and heart. Conclusion As To radiotherapy of esophagus cancer of the middle thoracic section and under thoracic section,IMRT has no advantage compared with 3DCRT, the selection of plan should be adapted to the situations of every patient.
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Received: 25 January 2011
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