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A compact PET detector readout using charge-to-time conversion

  • The readout of gamma detectors is considerably simplified when the event intensity is encoded as a pulse width (Pulse Width Modulation, PWM). Time-to-Digital-Converters (TDC) replace the conventional ADCs and multiple TDCs can be realized easily in one PLD chip (Programmable Logic Device). The output of a PWM stage is only one digital signal per channel which is well suited for transport so that further processing can be performed apart from the detector. This is particularly interesting for large systems with high channel density (e.g. high resolution scanners). In this work we present a circuit with a linear transfer function that requires a minimum of components by performing the PWM already in the preamp stage. This allows a very compact and also cost-efficient implementation of the front-end electronics.

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Author:M. Streun, H. Larue, C. Parl, Karl Ziemons
Parent Title (English):2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)
Document Type:Article
Year of Completion:2009
Date of the Publication (Server):2013/02/04
First Page:1868
Last Page:1870
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik