Lecio Leonardo Luvezuti
National Institute of Cancer, Brazil
Scientific Tracks Abstracts: J Cancer Sci Ther
The objective of this study was to compare three techniques of radiotherapy treatments, with correction of
heterogeneities, in seven patients diagnosed with distal esophageal cancer: IMRT with seven co-planar fields
evenly distributed at equal intervals, VMAT composed of two arcs of 359.8┬║ and 3DCRT with four co-planar fields
(two antero-posterior and two oblique). This study is retrospective and evaluated the treatments regarding PTV
coverage, Paddick conformity index, monitor units, heterogeneity index and dose-volume parameters in organs
at risk. The IMRT and VMAT plans reduced the irradiated lung volume with the 20 Gy dose (V20lung) and,
consequently, the mean dose in the lung ( ´?ę´?« The mean reductions with the IMRT and VMAT techniques in relation
to 3DCRT for V20lung were, respectively, 5.69% and 5.72%. Regarding the parameter , the reduction was of 1.59 Gy
and 1.26 Gy, respectively. The IMRT and VMAT techniques also showed better dose conformity values in the target
volume. There was a significant dose reduction in critical organs (spinal cord and heart) in relation to 3DCRT plans.
Thus, the lung volume exposed to radiation can be reduced with IMRT and VMAT and the dose prescribed and the
dose prescribed for this type of treatment can be escalated, but future clinical studies that confirm this hypothesis
are still necessary.
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Lecio Leonardo Luvezuti is a Medical Physicist who has been working on the field of radiotherapy for almost four years in Curitiba, Brazil. The work presented here is a term paper he developed for his Residency program at National Institute of Cancer in Rio de Janeiro, Brazil. Through this study, we intend to establish strategies to be adopted in modulated techniques for esophageal cancer, besides obtaining preliminary results to delineate future clinical studies.
E-mail: [email protected]
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