TY - GEN
T1 - A sinogram based technique for image correction and removal of metal clip artifacts in cone beam breast CT
AU - Wang, T.
AU - Shen, Y.
AU - Zhong, Y.
AU - Lai, C. J.
AU - Wang, J.
AU - Shaw, C. C.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - Cone beam CT (CBCT) technique provides true three-dimensional (3D) images of a breast; however, metal clips and needles used for surgical planning can cause artifacts, which may extend to many adjacent slices, in the reconstructed images obtained by the Feldkamp-Davis-Kress (FDK) filtered backprojection method, In this paper, a sinogram based method to remove the metal clips in the projection image data is described and discussed for improving the quality of reconstructed breast images. First, the original projection data was reconstructed using the FDK algorithm to obtain a volumetric image with metal clips and artifacts. Second, the volumetric image was segmented by using the threshold method to obtain a 3D map of metal objects. Third, a forward projection algorithm is applied to the metal object map to obtain projection map of metal objects. Finally, the original projection images and projection map of metal objects are reorganized into sinograms for correction in the angular space on a pixel-by-pixel basis. Cone beam CT images of a mastectomy breast specimen are used to demonstrate the feasibility of using this technique for removal of metal object artifacts. Preliminary results have demonstrated that metal objects artifacts in 3D images were reduced and the image quality were improved.
AB - Cone beam CT (CBCT) technique provides true three-dimensional (3D) images of a breast; however, metal clips and needles used for surgical planning can cause artifacts, which may extend to many adjacent slices, in the reconstructed images obtained by the Feldkamp-Davis-Kress (FDK) filtered backprojection method, In this paper, a sinogram based method to remove the metal clips in the projection image data is described and discussed for improving the quality of reconstructed breast images. First, the original projection data was reconstructed using the FDK algorithm to obtain a volumetric image with metal clips and artifacts. Second, the volumetric image was segmented by using the threshold method to obtain a 3D map of metal objects. Third, a forward projection algorithm is applied to the metal object map to obtain projection map of metal objects. Finally, the original projection images and projection map of metal objects are reorganized into sinograms for correction in the angular space on a pixel-by-pixel basis. Cone beam CT images of a mastectomy breast specimen are used to demonstrate the feasibility of using this technique for removal of metal object artifacts. Preliminary results have demonstrated that metal objects artifacts in 3D images were reduced and the image quality were improved.
KW - breast imaging
KW - cone beam CT
KW - metal artifacts correction
UR - http://www.scopus.com/inward/record.url?scp=84901608803&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901608803&partnerID=8YFLogxK
U2 - 10.1117/12.2043927
DO - 10.1117/12.2043927
M3 - Conference contribution
AN - SCOPUS:84901608803
SN - 9780819498267
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Medical Imaging 2014
PB - SPIE
T2 - Medical Imaging 2014: Physics of Medical Imaging
Y2 - 17 February 2014 through 20 February 2014
ER -