An analytical method for the calculation of ratios of mean restricted collision stopping powers (L/p)(g)m averaged over the charged particle spectra and the photon spectrum that is accurate to first order has been developed, and it has been explored whether a moderate change in the photon fluence spectrum with field size has an effect on the mean restricted collision stopping power ratio in high-Z materials. The results of this study indicate that for the case of a miniphantom, moderate changes in the photon fluence spectrum have only a weak effect on the ratios of mean restricted collision stopping powers.
- Charged particle spectra
- Collision stopping power
- Photon spectrum
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging