title: Estimated spectrum of a 4-MV therapeutic beam.
abstract: We have made a comparative investigation of the estimated spectra obtained by the Laplace transform analysis of the transmitted exposure data measured in an absorption study of a 4-MV x-ray beam. Four transform pair models currently used with this method have been evaluated. It has been determined that the Archer-Wagner model provides a valid representation of the measured transmission data and yields an estimated spectrum which most closely resembles a Monte Carlo spectrum calculated for a 4-MV therapeutic x-ray beam available from a typical medical accelerator.
mesh_terms: D001699:Biometry; D006283:Health Physics; D006801:Humans; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy; D013057:Spectrum Analysis