65 0

Bone-induced streak artifact suppression in sparse-view CT image reconstruction

Title
Bone-induced streak artifact suppression in sparse-view CT image reconstruction
Author
권오경
Keywords
Streak artifact; Sparse-view CT; Compressed sensing; ART; Total variation
Issue Date
2012-08
Publisher
BioMed Central
Citation
BioMedical Engineering OnLine, 2012, 11(1), P.44
Abstract
Background: In sparse-view CT imaging, strong streak artifacts may appear around bony structures and they often compromise the image readability. Compressed sensing (CS) or total variation (TV) minimization-based image reconstruction method has reduced the streak artifacts to a great extent, but, sparse-view CT imaging still suffers from residual streak artifacts. We introduce a new bone-induced streak artifact reduction method in the CS-based image reconstruction.Methods: We firstly identify the high-intensity bony regions from the image reconstructed by the filtered backprojection (FBP) method, and we calculate the sinogram stemming from the bony regions only. Then, we subtract the calculated sinogram, which stands for the bony regions, from the measured sinogram before performing the CS-based image reconstruction. The image reconstructed from the subtracted sinogram will stand for the soft tissues with little streak artifacts on it. To restore the original image intensity in the bony regions, we add the bony region image, which has been identified from the FBP image, to the soft tissue image to form a combined image. Then, we perform the CS-based image reconstruction again on the measured sinogram using the combined image as the initial condition of the iteration. For experimental validation of the proposed method, we take images of a contrast phantom and a rat using a micro-CT and we evaluate the reconstructed images based on two figures of merit, relative mean square error and total variation caused by the streak artifacts.Results: The images reconstructed by the proposed method have been found to have smaller streak artifacts than the ones reconstructed by the original CS-based method when visually inspected. The quantitative image evaluation studies have also shown that the proposed method outperforms the conventional CS-based method.Conclusions: The proposed method can effectively suppress streak artifacts stemming from bony structures in sparse-view CT imaging.
URI
https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/1475-925X-11-44http://hdl.handle.net/20.500.11754/48854
ISSN
1475-925X
DOI
10.1186/1475-925X-11-44
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE