Abstract
The possibility of performing proton radiography by using the proton angular spread due to Coulomb multiple scattering was investigated, for the first time, with an emulsion film detector. Two different phantoms were irradiated with the therapeutic proton beam at the Paul Scherrer Institut (PSI) in Villigen, Switzerland. The first one is a simple polymethylmethacrylate (PMMA) block having two different thicknesses (4 cm and 3 cm), and the second one is a PMMA cube with five aluminum rods embedded along a diagonal. Only one emulsion film was needed to perform the radiography, an important issue as the analysis of this kind of detector is time-consuming. Furthermore, the method showed an enhanced contrast when high atomic-number materials are traversed. This gives an advantage, when compared to proton range radiography.
Highlights
Proton radiography is an imaging technique undergoing a growing development, following the widespread use of proton-therapy for cancer treatment
One double-layer nuclear emulsion film allows for high precision tracking of charged particles, and the angular distribution can be reconstructed with a resolution of 1 mrad [5]
We report on the first results of proton radiography by means of multiple
Summary
Proton radiography is an imaging technique undergoing a growing development, following the widespread use of proton-therapy for cancer treatment. We exploit an alternative method to perform the radiography, based on the evaluation of Coulomb multiple scattering of protons while traversing different materials. This approach requires a detector with a high angular resolution, for which emulsion films represent the optimal solution. One double-layer nuclear emulsion film allows for high precision tracking of charged particles, and the angular distribution can be reconstructed with a resolution of 1 mrad [5] With this methodology, only a single emulsion film is needed for the proton multiple scattering evaluation, with the clear advantage of a faster data scanning and analysis procedure. The method features, with respect to the proton range radiography, an increased contrast when different atomic number materials are Instruments 2019, 3, 19; doi:10.3390/instruments3010019 www.mdpi.com/journal/instruments
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