FPGA based Time-To-Digital Converter for Time of Flight Computed Tomography
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FPGA time-to-digital converter for time-of-flight CT; instrumentation engineering.
This is an engineering study of a time-to-digital converter for medical imaging, not of research practice.
Domain medical-imaging hardware engineering; object is a TDC device, not research practice.
Résumé
Time-of-Flight Computed Tomography (ToF-CT) is a novel research path to improve current CT scanners. By measuring the travel time for photons to reach the detectors and discriminating scattered photons from primary photons, we expect to be able to reduce the dose delivered during the procedure or to increase the image quality. Many challenging requirements must be met in order to build a first ToF-CT prototype scanner. One of them is the ability to digitize the energy and time information of the incoming X-ray photons with a high precision and managing the high data rate.This work focuses on a Time-to-Digital Converter (TDC) built in an FPGA to measure the time of flight of X-ray photons. These time measurements, combined with the energy measurement of the incoming photons, are used to generate ToF histograms for different energy ranges. The current implementation can measure energy with a Time-Over-Threshold scheme using 1 ns time resolution, and can measure time-of-flight with 10 ps FWHM precision in a 2 ns narrow dynamic range and a 16 ps FWHM precision on its full scale range of around 30 ns. Moreover, the TDC is capable of sampling all hits at a 25 Mhit/s rate, which is sufficient for current ToF-CT goals. This TDC is scalable for a multi-channel implementation for the first ToF-CT scanner.
Conservé avec la notice de tri, où il sert de preuve aux étiquettes ci-dessus.
La notice
- Revue
- Thématique
- Medical Imaging Techniques and Applications
- Domaine
- Medicine
- Établissements canadiens
- Institut interdisciplinaire d'innovation technologiqueUniversité de Sherbrooke
- Organismes subventionnaires
- Canada Research ChairsCanada Foundation for InnovationCMC Microsystems
- Mots-clés
- Field-programmable gate arrayComputer scienceComputed tomographyTime-to-digital converterTime of flightComputer hardwareTelecommunicationsPhysicsOpticsMedicine
- Résumé présent dans OpenAlex
- oui