Investigation of the effects on dose calculations of correction-based algorithms in different tissue medium

The aim of this study is to determine the effects correction-based algorithms on dose distributions in inhomogeneous medium and dosimetric parameters depending preferred breast lung treatment plans. In planning system (TPS) which Pencil Beam Convolution (PBC) calculation algorithm used, calculations were performed different Modified Batho Equivalent Tissue-Air Ratio (ETAR) for soft tissue, bone air medium. Rectilinear virtual phantoms created TPS materials, deep values distribution profiles at lateral depth obtained. Intensity modulated radiotherapy (IMRT) technique was applied 20 patients with cancer diagnosis computed tomography (CT) sections, performed. Different obtained within target volume calculated. Although calculated below 1% tissue phantom, as approximately 20% It concluded that mediums have a significant effect TPS.