Fast readout of GEM detectors for medical imaging

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• 作者：M. Bucciantonio^a ; ^b ; ^{martina.bucciantonio@cern.ch} ; U. Amaldi^a ; R. Kieffer^a ; N. Malakhov^a ; F. Sauli^a ; D. Watts^a
• 关键词：Data acquisition ; GEM ; Hadrontherapy ; Proton Range Radiography
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2013
• 出版时间：1 August, 2013
• 年：2013
• 卷：718
• 期：Complete
• 页码：160-163
• 全文大小：1273 K

文摘

We describe the design and implementation of a fast data acquisition (DAQ) system for Gas Electron Multiplier (GEM) trackers applied to imaging and dosimetry in hadrontherapy. Within the AQUA project of the TERA foundation a prototype of Proton Range Radiography of 30¡Á30 cm² active area has been designed and built to provide in-beam integrated density images of the patient before treatment. It makes use of a pair of GEMs to record position and direction of protons emerging from the target.

A fast data acquisition rate close to 1 MHz will allow obtaining a good resolution in-beam proton radiography in a few seconds. A dedicated fast front-end circuit for GEM detectors (GEMROC by AGH-Crakow University) is read by the FPGA based DAQ card (GR_DAQ), developed by the AQUA group. The same system is under evaluation (within the ENVISION European project) to realize the in-vivo dosimetry, based on detecting secondary light particles during the treatment of the patient.