Comparison of 3D conformal and intensity modulated radiotherapy in head and neck cancer: Dosimetric and radiobiology evaluation

The aim of this study was to compare the dosimetric and radiobiological efficiency of various intensity modulated radiotherapy (IMRT) techniques with 3D conventional radiotherapy (3D-CRT) technique in the treatment of early-stage oral tongue cancer. Materials and Methods: This study was performed on 38 CT images of patients who were planned with 3D-CRT and three sets of IMRT treatment plans including five, seven and nine fields with prescribed dose of 70 Gy to planning target volume. The dose volume histograms, homogeneity index (HI), and conformity index (CI) were derived using Eclipse treatment planning system.