CT-Net: Cascaded T-shape network using spectral redundancy for dual-energy CT limited-angle reconstruction
Dual-energy computed tomography (DECT) shows promising clinical significance in substance identification and quantitative analysis. Mostly dual-energy CT scanning systems use two sets of x-ray sources and detectors for full scanning to simultaneously acquire X-ray data of materials at high- and low-...
Saved in:
Published in | Biomedical signal processing and control Vol. 79; p. 104072 |
---|---|
Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.01.2023
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Dual-energy computed tomography (DECT) shows promising clinical significance in substance identification and quantitative analysis. Mostly dual-energy CT scanning systems use two sets of x-ray sources and detectors for full scanning to simultaneously acquire X-ray data of materials at high- and low-energy levels. The reconstructed high- and low-energy CT images have spectral redundancy in the energy domain. We propose a one-step dual-energy limited-angle reconstruction scheme exploiting the energy domain spectral redundancy. The scheme consists of a sinogram domain network(SD-Net), a reconstruction unit(RU), and an image domain network(ID-Net). After SD-Net complements the dual-energy limited-angle incomplete projection data, a RU is used to reconstruct the CT images. Finally, ID-Net processes the reconstructed CT images into high-quality CT images. We propose a Cascaded T-shape Network(CT-Net) based on spectral redundancy to improve DECT image quality. The CT-Net consists of a backbone net, a low-energy branch, and a high-energy branch. CT-Net can directly map incomplete projection data into high-quality DECT images that can be used for clinical diagnosis. Qualitative and quantitative results demonstrate the excellent performance of CT-Net in preserving edges, removing artifacts, and suppressing noise. Two common DECT applications, such as virtual non-contrast (VNC) imaging and iodine contrast agent quantification, prove the clinically promising potential of CT-Net.
•We propose a one-step dual-energy limited-angle reconstruction strategy based on CT-Net.•We designed a novel loss function for dual-energy limited-angle reconstruction in CT-Net.•DE material decomposition was performed to validate the clinical utility. |
---|---|
ISSN: | 1746-8094 1746-8108 |
DOI: | 10.1016/j.bspc.2022.104072 |