Continuous DoI determination by gaussian modelling of linear and non-linear scintillation light distributions

Roberto Pani, Shervin Nourbakhsh, Priscilla Pani, Paolo Bennati, Sergio Lo Meo, Maria Nerina Cinti, Rosanna Pellegrini, Bartolomeo Cassano, Marco Bettiol, Raffaele Scafe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations

Abstract

The Depth of Interaction (DoI) detection is crucial in many medical imaging applications such as small ring PET and high resolution SPECT. In this work we investigate the possibility to discriminate the DoI using continuous crystals. A LaBr 3(Ce) crystal has been used in the detection system for its intrinsic high light yield, that especially at low energies (e.g. 140 keV) reduces considerably the statistical uncertainties increasing the DoI discrimination power. The innovative suggestion of this work is the use of spectrometric observables to discriminate events on top and bottom of the crystal, under the hypothesis that scintillation light distributions can be parameterized by a gaussian model. The spread of the light cone (σ) is proportional to the DoI simply by geometrical considerations, but under the gaussian hypothesis relations between the spectrometric variables (maximum high I and integral of the distribution N) and the DoI become a straightforward consequence. Two methods are proposed and discussed: a linear treatment of the light distribution and a non linear (quadratic) manipulation of it. The expected correlations between the spectrometric variables (N and I), according to the gaussian model, are checked using a specific Monte Carlo simulation of the experimental apparatus. Those are then compared with experimental data obtained irradiating the LaBr3:Ce crystal with a Tc 99m collimated source. A close agreement between experimental data and MC is verified. Finally, a preliminary test on experimental data has been performed irradiating the crystal with a Co 57 source, in order to investigate the strong dependence of the non linear manipulation of the light distribution to the DoI.

Original languageEnglish (US)
Title of host publication2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
Pages3386-3389
Number of pages4
DOIs
StatePublished - Mar 26 2012
Event2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 - Valencia, Spain
Duration: Oct 23 2011Oct 29 2011

Publication series

NameIEEE Nuclear Science Symposium Conference Record
ISSN (Print)1095-7863

Other

Other2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011
CountrySpain
CityValencia
Period10/23/1110/29/11

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    Pani, R., Nourbakhsh, S., Pani, P., Bennati, P., Lo Meo, S., Cinti, M. N., Pellegrini, R., Cassano, B., Bettiol, M., & Scafe, R. (2012). Continuous DoI determination by gaussian modelling of linear and non-linear scintillation light distributions. In 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2011 (pp. 3386-3389). [6152614] (IEEE Nuclear Science Symposium Conference Record). https://doi.org/10.1109/NSSMIC.2011.6152614