Dosimetric comparison of three radiotherapy plans for nasopharynx carcinoma
CHEN Hai-xiong
SONG Bing-wen
DING Zheng-hua
Abstract：Objective To compare step - and - shoot intensity modulated radiation therapy(IMRT)of 7 or 9 beam with volume modulate arc therapy(VMAT)for nasopharyngeal carcinoma(NPC,Phase Ⅰ - Ⅲ)patients with re-gard to the sparing effect on dosimetic quality and efficiency of delivery. Methods Twelve patients who diagnosed with NPC were treated with IMRT 7 beam,9 beam and VMAT by the eclipse planning system. Dosimetric comparisons among these 3 plans were analyzed including sparing of PTV,sparing of OARs and delivery time. Results All the 3 plans can meet the clinical dosimetric requirements. There was no significant difference in coverage,homogeneity(HI)or conformity (CI)of PTV among all the 3 plans. The protections of OARs in all the 3 plans were consistent with clinical requirement. However,significant lower machine hops and shorter delivery time were revealed in VMAT. Conclusion Our results in-dicate that all 3 therapy plans could meet the clinical dosimetric requirements for the NPC(Phase Ⅰ - Ⅲ),but VMAT provides better treatment efficiency. The choice between IMRT 7 and 9 beam shall be considered according to the protec-tion of OARs and general condition.
Keywords：nasopharyngeal carcinomaradiotherapyintensity modulated radiotherapyvolumetric modulated arc therapydosimtrics
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 1673-1676 )