Image reconstruction for a multi-layer Compton Telescope: an analytical model for three interaction events.

Image reconstruction for a multi-layer Compton Telescope: an analytical model for three interaction events.
Phys Med Biol. 2020 Apr 24;:
Authors: Roser J, Muñoz E, Barrientos L, Barrio J, Bernabéu Alberola J, Borja-Lloret M, Etxebeste A, Llosa G, Ros A, Viegas R, Oliver JF
Abstract
Compton Cameras are electronically collimated photon imagers suitable for sub-MeV to few MeV gamma-ray detection. Such features are desirable to enable in vivo range verification in hadron therapy, through the detection of secondary Prompt Gammas. A major concern with this technique is the poor image quality obtained when the incoming gamma-ray energy is unknown. Compton Cameras with more than two detector planes (multi-layer Compton Cameras) have been proposed as a solution, given that these devices incorporate more signal sequences of interactions to the conventional two interaction events. In particular, three interaction events convey more spectral information as they allow inferring directly the incident gamma-ray energy. A three-layer Compton Telescope based on continuous Lanthanum (III) Bromide crystals coupled to Silicon Photomultipliers is being developed at the IRIS group of IFIC-Valencia. In a previous work we proposed a spectral reconstruction algorithm for two interaction events based on an analytical model for the formation of the signal. To fully exploit the capabilities of our prototype, we present here an extension of the model for three...

Source: Physics in Medicine and Biology - April 23, 2020 Category: Physics Authors: Roser J, Muñoz E, Barrientos L, Barrio J, Bernabéu Alberola J, Borja-Lloret M, Etxebeste A, Llosa G, Ros A, Viegas R, Oliver JF Tags: Phys Med Biol Source Type: research