9 May 2012 Characterization of MRI-compatible PET detector modules by optical excitation of the scintillator material
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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.
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Balázs Játékos, Balázs Játékos, Zoltán Kolozsi, Zoltán Kolozsi, Emoke Lorincz, Emoke Lorincz, Ferenc Ujhelyi, Ferenc Ujhelyi, Attila Barócsi, Attila Barócsi, Gábor Erdei, Gábor Erdei, } "Characterization of MRI-compatible PET detector modules by optical excitation of the scintillator material", Proc. SPIE 8439, Optical Sensing and Detection II, 84391R (9 May 2012); doi: 10.1117/12.922618; https://doi.org/10.1117/12.922618

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