| SHA Xiang-yan,WANG Yun-lai,MA Lin.Dosimetric evaluation of lower-neck subclinical target volume in nasopharyngeal carcinoma for three different intensity modulated radiotherapy techniques[J].Chinese Journal of Radiological Medicine and Protection,2009,29(1):68-71 |
| Dosimetric evaluation of lower-neck subclinical target volume in nasopharyngeal carcinoma for three different intensity modulated radiotherapy techniques |
| Received:February 28, 2008 |
| DOI：10.3760/cma.j.issn.0254-5098.2009.01.021 |
| KeyWords:Nasopharyngeal carcinoma Intensity modulated radiotherapy Dosimetry |
| FundProject: |
| Author Name | Affiliation | E-mail | | SHA Xiang-yan | Department of Radiotherapy, PLA General Hospital, Beijing 100853, China | | | WANG Yun-lai | Department of Radiotherapy, PLA General Hospital, Beijing 100853, China | nanyangwang@163.com | | MA Lin | Department of Radiotherapy, PLA General Hospital, Beijing 100853, China | | | 戴相昆 | Department of Radiotherapy, PLA General Hospital, Beijing 100853, China | |
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| Abstract:: |
| Objective To evaluate the absorbed doses of lower-neck and supraclaviclar subclinical target and the normal tissues of nasopharyngeal carcinoma using three different intensity-modulated radiation therapy (IMRT) techniques. Methods Three radiotherapy techniques were single tangential low neck-supraclavicular field technique (tech1), seven portal IMRT in which the gantry angles are 180°,150°,120°,90°,270°,210° (tech2) and 240°and eight portal IMRT in which the gantry angles are 180°,150°,120°,90°,0°,270°,210°and 240°(tech3). The dose distribution of lower-neck and supraclaviclar subclinical target and normal tissues were analyzed through the dose-volume histograms, high dose volumes were analyzed using V60 (volume of accepted >60Gy/all volume×100%). The delivery efficiencies were evaluated by means of the total number of segments and MUs. Results The V60 of PTV2 were 65%,10% and 3% in tech1, tech2 and tech3 respectively. The maximum doses of spinal cord were 42.0, 48.9 and 45.1Gy in tech1, tech2 and tech3 respectively. The average doses of trachea were 32.92, 52.17 and 36.56Gy in tech1, tech2 and tech3 respectively.Conclusion Tech1 is simple method, but the dose distribution is very nonuniform. Tech2 is better than the Tech1, but the spinal cord and trachea receive the highest doses in three strategies. Tech3 uses less number of segments and MUs than Tech2, and has the best dose distribution. |
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