Factors influencing conformity index in radiotherapy for non-small cell lung cancer.
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Affiliation
Department of Radiation Oncology, St. Lukes Hospital, Dublin, Ireland. sinead.brennan09@gmail.comIssue Date
2010MeSH
AgedAged, 80 and over
Carcinoma, Non-Small-Cell Lung
Female
Humans
Lung Neoplasms
Male
Middle Aged
Radiometry
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted
Radiotherapy, Conformal
Reproducibility of Results
Sensitivity and Specificity
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Factors influencing conformity index in radiotherapy for non-small cell lung cancer. 2010, 35 (1):38-42 Med DosimJournal
Medical dosimetry : official journal of the American Association of Medical DosimetristsDOI
10.1016/j.meddos.2009.01.003PubMed ID
19931013Abstract
The radiotherapy conformity index (CI) is a useful tool to quantitatively assess the quality of radiotherapy treatment plans, and represents the relationship between isodose distributions and target volume. A conformity index of unity implies high planning target volume (PTV) coverage and minimal unnecessary irradiation of surrounding tissues. We performed this analysis to describe the CI for lung cancer 3-dimensional conformal radiotherapy (3DCRT) and to identify clinical and technical determinants of CI, as it is not known which factors are associated with good quality 3D conformal radiotherapy treatment planning. Radiotherapy treatment plans from a database of 52 patients with inoperable Stage 1 to 3b lung cancer, on a hypofractionated 3DCRT trial were evaluated. A CI was calculated for all plans using the definition of the ICRU 62:CI = (TV/PTV), which is the quotient of the treated volume (TV) and the PTV. Data on patient, tumor, and planning variables, which could influence CI, were recorded and analyzed. Mean CI was 2.01 (range = 1.06-3.8). On univariate analysis, PTV (p = 0.023), number of beams (p = 0.036), medial vs. lateral tumor location (p = 0.016), and increasing tumor stage (p = 0.041) were associated with improved conformity. On multiple regression analysis, factors found to be associated with CI included central vs. peripheral tumor location (p = 0.041) and PTV size (p = 0.058). The term 3DCRT is used routinely in the literature, without any indication of the degree of conformality. We recommend routine reporting of conformity indices. Conformity indices may be affected by both planning variables and tumor factors.Item Type
ArticleLanguage
enISSN
1873-4022ae974a485f413a2113503eed53cd6c53
10.1016/j.meddos.2009.01.003
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