期刊
IEEE ACCESS
卷 9, 期 -, 页码 168485-168495出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2021.3134636
关键词
Computed tomography; Photonics; Image reconstruction; Training; Energy resolution; Dictionaries; X-ray imaging; X-ray CT; material decomposition; photon-counting detector; super energy resolution
资金
- Program Hubert Curien Partnerships (PHC)-Cai Yuanpei [41400TC]
- Committee of Science and Technology of Shanghai [19510711200]
- European Union [643694]
- Project Point Accueil Installation (PAI) Region Auvergne-Rhone-Alpes [2000688501-40890]
- International Research Project Modelisation et traitement d'images et du signal pour la Sante (METISLAB)
Spectral photon-counting CT shows potential for quantitative material decomposition compared to traditional CT methods, but current challenges include accurate decomposition of low-concentration materials. This study proposes a super-energy-resolution method with coupled dictionary learning to improve material decomposition accuracy, showing significant progress in both physical phantoms and in vivo data.
Spectral photon-counting CT offers novel potentialities to achieve quantitative decomposition of material components, in comparison with traditional energy-integrating CT or dual-energy CT. Nonetheless, achieving accurate material decomposition, especially for low-concentration materials, is still extremely challenging for current sCT, due to restricted energy resolution stemming from the trade-off between the number of energy bins and undesired factors such as quantum noise. We propose to improve material decomposition by introducing the notion of super-energy-resolution in sCT. The super-energy-resolution material decomposition consists in learning the relationship between simulation and physical phantoms in image domain. To this end, a coupled dictionary learning method is utilized to learn such relationship in a pixel-wise way. The results on both physical phantoms and in vivo data showed that for the same decomposition method using lasso regularization, the proposed super-energy-resolution method achieves much higher decomposition accuracy and detection ability in contrast to traditional image-domain decomposition method using L1-norm regularization.
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