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Étude et réalisation d'une électronique rapide à bas bruit pour un détecteur de rayons X à pixels hybrides destiné à l'imagerie du petit animal

Abstract : Since the invention of computerized tomography (CT), charge integration detector were widely employed for X-ray biomedical imaging applications. Nevertheless, other options exist. A new technology of direct detection using semiconductors has been developed for high energy physics instrumentation. This new technology, called hybrid pixel detector, works in photon counting mode and allows for selecting the minimum energy of the counted photons. The imXgam research team at CPPM develops the PIXSCAN demonstrator, a CT-scanner using the hybrid pixel detector XPAD. The aim of this project is to evaluate the improvement on image quality and on dose delivered during X-ray examinations of a small animal. After a first prototype of hybrid pixel detector XPAD1 proving the feasibility of the project, a complete imager XPAD2 was designed and integrated in the PIXSCAN demonstrator. Since then, with the evolution of microelectronic industry, important improvements are conceivable. To reducing the size of pixels and to improving the energy resolution of detectors, a third design XPAD3 was conceived and will be soon integrated in a second generation of PIXSCAN demonstrator. In this project, my thesis's work consisted in taking part to the design of the detector readout electronics, to the characterization of the chips and of the hybrid pixel detectors, and also to the definition of a autozeroing architecture for pixels.
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https://tel.archives-ouvertes.fr/tel-00366861
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Submitted on : Monday, March 9, 2009 - 6:01:32 PM
Last modification on : Thursday, January 18, 2018 - 1:55:05 AM
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B. Chantepie. Étude et réalisation d'une électronique rapide à bas bruit pour un détecteur de rayons X à pixels hybrides destiné à l'imagerie du petit animal. Sciences du Vivant [q-bio]. Université de la Méditerranée - Aix-Marseille II, 2008. Français. ⟨tel-00366861⟩

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