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Optimization of a spectral X-Ray detector for CT-scan medical applications

Technological challenge: Photonics, Imaging and displays (learn more)

Department: Département d'Optronique (LETI)

Laboratory: Laboratoire conception de Circuits Intégrés Intelligents pour l'image

Start Date: 01-09-2022

Location: Grenoble

CEA Code: SL-DRT-22-0418

Contact: arnaud.peizerat@cea.fr

Among medical imaging systems, CT scanners (Computed Tomography scanners) take "sectional" images of the human body, allowing a 3D reconstruction of the concerned body parts (skeleton, heart, lung, etc.) and leading to an improved medical diagnosis. Recently, CT scanners have entered a new era through the use of photon-counting detectors. They have in fact benefited from the progress of CMOS technologies and the development of "direct conversion" semiconductors. The present PhD topic aims at exploring the possibilities of improving these detectors which will lead, tomorrow, to a new generation of scanners. During 3 years, the work of the future PhD student will first consist in building a bibliography on photon-counting detectors, a detailed understanding of the state of the art being an essential prerequisite. Secondly, the CEA's simulation resources will be made available in order to propose and evaluate new optimization techniques, in particular with regard to the implementation of advanced functions (self-adaptation, data correction, etc. ) within the pixel. A third phase will be dedicated to the design of a CMOS circuit which will be manufactured then tested, and measurement will be compared with the simulation results. Finally, a fourth phase will be devoted to the writing of the manuscript and the PhD defense. Along this path, a high level of innovation will be demonstrated through patents and international publications. The dynamic and autonomous candidate will have a master's degree or equivalent (engineering degree), specializing in microelectronics. Profiency in circuit design tools will be appreciated (Cadence, Eldo, Spectre, Matlab,?). Knowledge of medical imaging and radiation detectors will be a plus.

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