PMID- 34384055
OWN - NLM
STAT- MEDLINE
DCOM- 20220106
LR  - 20220106
IS  - 1361-6560 (Electronic)
IS  - 0031-9155 (Linking)
VI  - 66
IP  - 18
DP  - 2021 Sep 9
TI  - Multi-segment spectral reconstruction via zero-value set prior.
LID - 10.1088/1361-6560/ac1d20 [doi]
AB  - Most scanning schemes of multi-energy computed tomography (MECT) require multiple 
      sets of full-scan measurements under different x-ray spectra, which limits the 
      application of MECT with incomplete scan. To handle this problem, a flexible MECT 
      scanning strategy is proposed in this paper, which divides one half scan into 
      three curves. Also, a novel MECT reconstruction algorithm is developed to relax 
      the requirement of data acquisition of MECT. For MECT, gradient images of CT 
      images at different energies ideally share the same position of zero-value set 
      (Pos-OS) for the same object. Based on this observation, the characteristics of 
      limited-angle artifacts is first explored, and it is found that the limited-angle 
      artifacts in the image domain are closely related to the angle trajectory of the 
      scan. Inspired by this discovery, the Pos-OS of the gradient image from the 
      fusion CT image is extracted, and it is incorporated as prior knowledge into the 
      TV minimization model in the form of equality constraints. The alternating 
      direction method is exploited to solve the improved optimization model 
      iteratively. Based on this, the proposed algorithm is derived to eliminate the 
      limited angle artifacts in the image domain.The experimental results show that 
      the proposed method achieves higher reconstruction quality under the designed 
      scanning configuration than other methods in the literature.
CI  - (c) 2021 Institute of Physics and Engineering in Medicine.
FAU - Wang, Yizhong
AU  - Wang Y
AUID- ORCID: 0000-0002-9760-3910
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Zhang, Wenkun
AU  - Zhang W
AUID- ORCID: 0000-0003-4720-2593
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Cai, Ailong
AU  - Cai A
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Liang, Ningning
AU  - Liang N
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Wang, Zhe
AU  - Wang Z
AD  - Beijing Engineering Research Center of Radiographic Techniques and Equipment, 
      Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, People's 
      Republic of China.
FAU - Wang, Linyuan
AU  - Wang L
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Zheng, Zhizhong
AU  - Zheng Z
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Li, Lei
AU  - Li L
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
FAU - Yan, Bin
AU  - Yan B
AD  - Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategic Support 
      Force Information Engineering University, Zhengzhou, People's Republic of China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20210909
PL  - England
TA  - Phys Med Biol
JT  - Physics in medicine and biology
JID - 0401220
SB  - IM
MH  - *Algorithms
MH  - *Artifacts
MH  - Image Processing, Computer-Assisted
MH  - Phantoms, Imaging
MH  - Tomography, X-Ray Computed
OTO - NOTNLM
OT  - fusion CT image
OT  - image domain
OT  - multi-energy CT
OT  - zero-value set
EDAT- 2021/08/13 06:00
MHDA- 2022/01/07 06:00
CRDT- 2021/08/12 20:04
PHST- 2021/05/10 00:00 [received]
PHST- 2021/08/12 00:00 [accepted]
PHST- 2021/08/13 06:00 [pubmed]
PHST- 2022/01/07 06:00 [medline]
PHST- 2021/08/12 20:04 [entrez]
AID - 10.1088/1361-6560/ac1d20 [doi]
PST - epublish
SO  - Phys Med Biol. 2021 Sep 9;66(18). doi: 10.1088/1361-6560/ac1d20.