General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DRT-24-0668
Direction
DRT
Thesis topic details
Category
Technological challenges
Thesis topics
New architectures in inverse geometry for spectral X-ray imaging
Contract
Thèse
Job description
Emerging technologies in the field of X-ray sources and detectors open up possibilities for envisioning new breakthrough systems in 3D imaging. In conventional tomography, a large-area detector captures images of an object exposed to X-rays from a point source. The latest generations of medical scanners also incorporate spectrometric semiconductor detectors, providing a real improvement in image quality.
The proposed thesis aims to shift the paradigm by designing a system that combines numerous distributed X-ray sources with a small-sized spectrometric detector. This inverse geometry is innovative in terms of system architectures, allowing relaxation of constraints on sensor dimensions and reduction of certain artifacts.
The thesis work will revolve around the design and simulation of new systems in inverse geometry, along with the development of associated reconstruction algorithms. These algorithms, based on proximal methods and capable of integrating neural networks, must leverage the rich information provided by the spectrometric detector under conditions of sparse acquisition. The student will utilize simulation and reconstruction tools developed within the laboratory and will also have access to experimental resources for validating the developments. Working within a multidisciplinary laboratory with extensive experience in spectrometric detector and X-ray system design, the student will engage in exchanges with external teams, including radiologists, to incorporate a final need into the research.
University / doctoral school
Ecole Doctorale de Physique de Grenoble (EdPHYS)
Université Grenoble Alpes
Thesis topic location
Site
Grenoble
Requester
Position start date
01/09/2024
Person to be contacted by the applicant
FOURNIER Clarisse clarisse.fournier@cea.fr
CEA
DRT/DTBS/STD/LDET
Centre de Grenoble
17, rue des Martyrs
38054 Grenoble Cedex 9
04 38 78 39 75
Tutor / Responsible thesis director
BRAMBILLA Andréa andrea.brambilla@cea.fr
CEA
DRT/DOPT//LASP
CEA/Grenoble
DOPT/SISP/LASP
CEA Grenoble, 17 rue des Martyrs
F38054 Grenoble Cedex 9, FRANCE
04.38.78.38.29
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