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Détecteur pour l'imagerie TEP, temps de vol et haute résolution spatiale

Abstract : Positron Emission Tomography (PET) is a 3D imaging technique used in cancer diagnosis and neuro-biological research. It uses the coincident detection of two 511 keV photons produced by the annihilation of positrons emitted by a biochemical tracer consumed by tissues. It thus makes it possible to measure the biological activity of organs. Precisely positioning the interaction of the 511 keV photons in the volume of the detector allows the reconstruction of resolved and contrasted images. In this thesis, we develop a detector composed of a scintillating crystal and Cherenkov radiator, the lead tungstate (PbWO₄) inserted in the structure of a Micro-Channel Plate PhotoMultiplier Tube (MCP-PMT). The direct deposition of the photoelectric layer on the crystal improves light collection and time resolution. This is the patented ClearMind project. We have worked on two of the main components of this detector. We have measured the properties of the scintillating crystals: light yield and time constants: 1.8 ns (55%) and 6 ns (40%) at room temperature. We then developed a photo-detection chain to measure the performances of the future ClearMind detector. We measure an excellent time resolution (less than 70 ps FWHM) and spatial resolution (1.5 mm FWHM), but a loss of efficiency on some MCP technologies. We propose development axes to improve these performances.
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Submitted on : Thursday, July 29, 2021 - 9:16:40 AM
Last modification on : Saturday, July 31, 2021 - 3:50:38 AM


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  • HAL Id : tel-03306231, version 1



Megane Follin. Détecteur pour l'imagerie TEP, temps de vol et haute résolution spatiale. Instrumentations et Détecteurs [physics.ins-det]. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPAST067⟩. ⟨tel-03306231⟩



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