TY - GEN
T1 - Object removal in gradient domain of cone-beam CT projections
AU - Bier, Bastian
AU - Berger, Martin
AU - Maier, Jennifer
AU - Unberath, Mathias
AU - Hsieh, Scott
AU - Bonaretti, Serena
AU - Fahrig, Rebecca
AU - Levenston, Marc E.
AU - Gold, Garry E.
AU - Maier, Andreas
N1 - Publisher Copyright:
© 2016 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2017/10/16
Y1 - 2017/10/16
N2 - We propose a method to reduce streak artifacts in cone-beam CT reconstructions that arise from the edges of dense objects outside the 3D field-of-view. To this end, ramp filtering is decomposed into a derivative- and a Hilbert transform step. This allows for spectral inpainting directly in gradient domain, such that only contributions of sharp edges are removed. We applied our approach to weight-bearing knee imaging data, where plastic pipes outside the field-of-view introduce notable streak artifacts. Streak artifacts in the reconstructions are reduced and on semi-simulated data the correlation coefficient could be improved from 0.88 to 0.99. The method is applicable for arbitrary object shapes and can be easily integrated into existing FDK reconstruction algorithms.
AB - We propose a method to reduce streak artifacts in cone-beam CT reconstructions that arise from the edges of dense objects outside the 3D field-of-view. To this end, ramp filtering is decomposed into a derivative- and a Hilbert transform step. This allows for spectral inpainting directly in gradient domain, such that only contributions of sharp edges are removed. We applied our approach to weight-bearing knee imaging data, where plastic pipes outside the field-of-view introduce notable streak artifacts. Streak artifacts in the reconstructions are reduced and on semi-simulated data the correlation coefficient could be improved from 0.88 to 0.99. The method is applicable for arbitrary object shapes and can be easily integrated into existing FDK reconstruction algorithms.
UR - http://www.scopus.com/inward/record.url?scp=85041492739&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85041492739&partnerID=8YFLogxK
U2 - 10.1109/NSSMIC.2016.8069480
DO - 10.1109/NSSMIC.2016.8069480
M3 - Conference contribution
AN - SCOPUS:85041492739
T3 - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
BT - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016
Y2 - 29 October 2016 through 6 November 2016
ER -