Abstract
We have remodeled the X-ray spectra estimation method, originally proposed by Waggener et al. (Med. Phys. 26(1999)1269), based on the iterative perturbation technique to minimize differences between measured and calculated transmission curves using low Z attenuators. With our approach, the iterative perturbation cycle is repeated until a reasonable spectrum is obtained. Furthermore, the degree of differences between the measured and calculated transmission curves is also checked using high Z attenuators. The present experimental study, conducted using 4, 10 and 15 MV X-ray beams from a linear accelerator, demonstrated that the spectrum varies strongly with the off-axis distance.
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