Hodgkin lymphoma (HL) treatment using varian eclipse irregular surface compensator. A dosimetric analysis and clinical results

• Published in: Physica medica 2016-09, Vol.32, p.318-318
• Main Authors: Herrera-Martinez, F, Toledano-Cuevas, D, Rodriguez-Ponce, M, Altamirano-Garcia, J
• Format: Article
• Language: English
• Subjects: Radiology
• ISSN: 1120-1797; 1724-191X
• DOI: 10.1016/j.ejmp.2016.07.199

Introduction A recommended technique for a radiation therapy treatment for HL is a mantle field technique. This technique in most of the cases represents a challenge for the dose calculation not only for the irregularity and size of the field but for the anatomical area to cover; going from the neck to mediastinal region and in some cases up to the axillar regions, thus represents an important problem when the required dose distribution has to be uniform enough to achieve coverage suggested standards, especially for those anatomies with short neck and/or fat chests which leaded to an undesired hot spots on neck and chin mostly and their correspondent side effects. In order to avoid this and improved the treatment, since 2010, mantle techniques are treated with compensators observing improvements in the dose distribution obtained. Purpose To improved quality on mantle technique for HL diminishing side effects. Method Each of this treatment plans were calculated using the Varian Eclipse irregular surface compensator calculation technique and verified using gamma index criteria. Each plan were compared with the blocked field of the same size, shape and energy. Results and conclusions On the dosimetric comparisons we observed a hot spots from 5% to 12% lower than the observed with a conventional technique and an improved hot spot localization according to clinical criteria. Clinically, side effects expected according to experience with blocked fields were diminished on about 70% of the cases on a five years follow-up.