May 17 – 20, 2015
La Biodola, Isola d'Elba
Europe/Rome timezone

SPAD Array Chips with Full Frame Readout for Crystal Characterization

May 18, 2015, 9:55 AM
Room Maria Luisa

Room Maria Luisa

Talk 1 - Advances in MR-PET instrumentation: detectors Session 1 - MR-PET and MR-SPECT Instrumentation: Detectors


Peter Fischer (Heidelberg University)


We present single photon sensitive 2D camera chips containing 88x88 avalanche photo diodes which can be read out in full frame mode with up to 400.000 frames per second. The sensors have an imaging area of ~5mm x 5mm covered by square pixels of ~56um x 56um with a ~55\% fill factor in the latest chip generation. The chips contain a self triggering logic with selectable (column) multiplicities of up to >=4 hits within an adjustable coincidence time window. The photon accumulation time window is programmable as well. First prototypes have demonstrated low dark count rates of <50kHz/mm2 (SPAD area) at 10 degree C for 10% masked pixels. One chip version contains an automated readout of the photon cluster position. The readout of the detailed photon distribution for single events allows the characterization of light sharing, optical crosstalk etc. in crystals or crystal arrays as they are used in PET instrumentation. This knowledge could lead to improvements in spatial or temporal resolution.

Primary author

Peter Fischer (Heidelberg University)


Mrs Ilaria Sacco (Heidelberg University) Dr Michael Ritzert (Heidelberg University) Mr Roberto Blanco (Heidelberg University) Dr Sascha Weyers (Fraunhofer Institute for Microelectronic Circuits and Systems)

Presentation materials