Tittel: Fotontellende CT
Sesjon: Fysikk. Høstmøte fredag 28. oktober kl 1115-1230
Moderator:
Rom: Agora 3, Clarion Hotel Oslo
Photon counting detectors can enable increased spatial resolution and improved contrast and/or lower radiation dose. In particular, lower concentrations of iodine can potentially be detected and quantified, which is important in angiography or perfusion imaging. Moreover, beam hardening artefacts will disappear with material base decomposition in the projection domain. We will describe the state of the art of photon counting CT detector technology, and how the major challenges such as high photon incidence rates (pile-up), charge sharing, and detection efficiency can be addressed. We examine also how the physical processes involved in photon detection lead to tradeoffs in photon counting CT system design.
Litteratur:
V. Sandfort, M. Persson, A. Pourmorteza, P. B. Noël, D. Fleischmann, M. J Willemink, “Spectral photon-counting CT in cardiovascular imaging”, J. Cardiovasc. Comput. Tomogr., 15(3), 218-225 (2021)
M. Danielsson, M. Persson, M. Sjölin, “Photon-counting x-ray detectors for CT”, Phys. Med. Biol., 66(3) 03TR01 (2021)
A. Pourmorteza et al, ”Abdominal imaging with contrast-enhanced photon-counting CT: first human experience” Radiology Vol 279 (2016)
L. Liu, N. Shapira, P. Sahbaee, M. Schnall, H. Litt, P. Noel “First-generation clinical dual-source photon-counting CT: ultra-low dose quantitative spectral imaging” https://doi.org/10.1101/2021.11.17.21266432