### Abstract

The ratio of coherent to Compton photons scattered by a tissuelike material depends on its effective atomic number. This ratio can, therefore, be used for the in vivo characterization of tissues. The intrinsic sensitivity of this measurement is defined as the change in the coherent to Compton ratio for a given change in the atomic number. The effect of the scatter angle on the sensitivity has already been described by us in a paper recently submitted to this journal. In this study, the dependence of the sensitivity on the energy of the incident photons is investigated in two ways. The first approach is quasitheoretical and is based on computations of the cross sections of the coherent and Compton scattering for various energies. The second approach is experimental and it involves the measurement of the scatter ratio from a series of K_{2}HPO_{4} solutions for three primary photon energies: 60, 81, and 140 keV. The combined effect of both the photon energy and the scatter angle on the sensitivity can be described by a single parameter which is the momentum transfer. It is concluded that for the limited range of the atomic numbers which apply to trabecular bone (8â‰¤ZÌ„â‰¤11) the momentum transfer reflects completely the effect of the scatter angle and photon energy on the sensitivity.

Original language | English (US) |
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Pages (from-to) | 31-36 |

Number of pages | 6 |

Journal | Medical physics |

Volume | 11 |

Issue number | 1 |

DOIs | |

State | Published - Jan 1984 |

Externally published | Yes |

### Keywords

- angular distribution
- compton effect
- cross sections
- hydrogen compounds
- in vivo
- kev range 100â1000
- kev range 10â100
- momentum transfer
- photon beams
- photosensitivity
- potassium phosphates
- scattering
- solutions
- tissues
- tissueâequivalent materials

### ASJC Scopus subject areas

- Biophysics
- Radiology Nuclear Medicine and imaging

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## Cite this

*Medical physics*,

*11*(1), 31-36. https://doi.org/10.1118/1.595473