A COMPARATIVE STUDY OF THE DISTRIBUTION OF ABSORBED DOSE IN TISSUE AT IRRADIATION OF LUNG TUMOURS

This paper presents a technique of special irradiating of which oneness consists of the corrections which have to be applied to absorbed dose in the tissue, because of the beam's crossing through the lung tissue of smaller density than normal tissue. The radiotherapeutic treatment of lung cancer imposed the applications of corrections for tissue inhomogeneity. From isodose curves we noticed that where the correction for tissue inhomogeneity wasn't introduced, the irradiation simulate was sub-optimal in the tumoral volume, being necessary a meaningful extension of the beams and involving excessive irradiation of organs at risk. Thus, introducing the correction for tissue inhomogeneity, is obtained the best alternative of the treatment planning with perfect framing of the tumour volume in prescribing isodose and with irradiation of organs at risk in normal boundary.