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Proceedings Paper

Characterization of MRI-compatible PET detector modules by optical excitation of the scintillator material
Author(s): Balázs Játékos; Zoltán Kolozsi; Emoke Lorincz; Ferenc Ujhelyi; Attila Barócsi; Gábor Erdei
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Paper Abstract

In the field of biomedical imaging there is a strong interest in combining modalities of positron emission tomography (PET) and magnetic resonance imaging (MRI). An MRI-compatible PET detector module has to be insensitive to the magnetic field that is why it needs to incorporate avalanche photodiodes (APD) or silicon photomultipliers (SiPM). We propose a new purely optical characterization method for these devices where no nuclear source is needed. In our method we use LED sources for both the direct illumination of silicon sensors and fluorescent excitation of the scintillator material. With this method we can measure the response characteristic and uniformity of pixels in sensor arrays as well as the optical cross-talk between neighboring pixels. In the same experimental setup we can also emulate the pulse response of the detector module (i.e. light-spread over the sensor array from a point source in the scintillator material). We present the detailed construction of the experimental setup and analyze the benefits and drawbacks of this method compared to the nuclear measurements. The viability of the idea is proven through the characterization of a SiPM array and a block detector module based on it.

Paper Details

Date Published: 9 May 2012
PDF: 10 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84391R (9 May 2012); doi: 10.1117/12.922618
Show Author Affiliations
Balázs Játékos, Budapest Univ. of Technology and Economics (Hungary)
Zoltán Kolozsi, Budapest Univ. of Technology and Economics (Hungary)
Emoke Lorincz, Budapest Univ. of Technology and Economics (Hungary)
Ferenc Ujhelyi, Budapest Univ. of Technology and Economics (Hungary)
Attila Barócsi, Budapest Univ. of Technology and Economics (Hungary)
Gábor Erdei, Budapest Univ. of Technology and Economics (Hungary)


Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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