CHARACTERISTIC FEATURES OF A HIGH-ENERGY X-RAY SPECTRA ESTIMATION METHOD BASED ON THE WAGGENER ITERATIVE PERTURBATION PRINCIPLE

Abstract

We have redeveloped a high-energy X-ray spectra estimation method reported by Iwasaki et al (Radiat Phys Chem 67: 81, 2003). The method is based on the iterative perturbation principle to minimize differences between measured and calculated transmission curves, originally proposed by Waggener et al (Med Phys 26: 1269, 1999). Estimating spectra of 4-15 MV X-ray beams from a linear accelerator, we describe characteristic features of the redeveloped method with regard to parameters including the pre-spectrum, energy bin width, measured transmission data, interpolated transmission data, and crevice.