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@INPROCEEDINGS{Streun:201246,
      author       = {Streun, M. and Nöldgen, Holger and Erven, A. and Espana,
                      S. and Jokhovets, L. and Marcinkowski, R. and Peters, C. and
                      Ramm, M. and Schramm, N. and Wüstner, Peter and
                      Vandenberghe, S. and Kemmerling, G. and van Waasen, S.},
      title        = {{PET} {S}cintillator {A}rrangement on digital {S}i{PM}s},
      reportid     = {FZJ-2015-03551},
      isbn         = {978-1-4799-0534-8},
      pages        = {4},
      year         = {2014},
      abstract     = {The common way to build a PET detector is to place an array
                      of scintillator elements on top of a photo detector. In
                      order to achieve high spatial resolution the scintillator
                      footprints are often smaller than the pixel size of the
                      photodetector. This requires light sharing and some kind of
                      algorithm like Anger-Logic in order to identify the correct
                      scintillator element in which the event took place. The
                      digital Silicon Photomultiplier DPC3200-22-44 (Philips
                      Digital Photon Counting) is a fully digital photo sensor
                      device [1]. Each pixel consists of 3200 individual micro
                      cells which are charged and read out under digital control.
                      The device (Tile) is organized as an array of 8 by 8 pixels
                      each of 3.9x3.9 mm2 size and is realized as a PCB equipped
                      with 16 dice. One die provides four pixels together with the
                      corresponding triggering, validation and readout
                      electronics. Depending on the configuration the detection of
                      an event on one die can cause the other dice to transmit
                      their data as well (neighbor logic). The obvious solution of
                      using neighbor logic and a scintillator matrix with light
                      guide covering the whole tile shows some drawbacks. After
                      each event all 16 dice will be busy and all pixels need to
                      be read out. This results in increased dead time and a lot
                      of data. Furthermore it turned out that sometimes pixels are
                      missing because dice were already busy and could not
                      transmit data when the event was detected. This will
                      complicate the identification of the event position. A
                      better performance can be obtained when the light is shared
                      only within the four pixels of each die and the dice work
                      independent from each other. We investigated the positioning
                      capability of different scintillator matrices and light
                      guides. These are arranged in such a way, that a single die
                      can only receive the light from a 4 by 4 array of LYSO
                      crystals which covers exactly the die dimensions. The
                      results show that clear crystal identification can be
                      achieved with such an arrangement. [1] Haemisch et al.,
                      Physics Procedia 37 (2012) 1546},
      month         = {Oct},
      date          = {2015-10-27},
      organization  = {2013 IEEE NUCLEAR SCIENCE SYMPOSIUM
                       AND MEDICAL IMAGING CONFERENCE, Seoul
                       (Korea), 27 Oct 2015 - 2 Nov 2015},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {89582 - Plant Science (POF2-89582)},
      pid          = {G:(DE-HGF)POF2-89582},
      typ          = {PUB:(DE-HGF)8},
      url          = {https://juser.fz-juelich.de/record/201246},
}