Title :
Motion Compensated Fan-Beam Reconstruction for Nonrigid Transformation
Author :
Taguchi, Katsuyuki ; Kudo, Hiroyuki
Author_Institution :
Sch. of Med., Russell H. Morgan Dept. of Radiol. & Radiol. Sci., Johns Hopkins Univ., Baltimore, MD
fDate :
7/1/2008 12:00:00 AM
Abstract :
We develop an approximate fan-beam algorithm to reconstruct an object with time-dependent nonrigid transformation such as the heart. The method is in the form of derivative back- projection filtering with compensation of affine transformations on a local basis. Computer simulations showed the proposed method significantly reduces image artifact due to nonrigid motion. Therefore, with very little motion artifact, the proposed method allowed us to reconstruct images from projections over about one motion cycle, resulting in reduced image noise level down to 40% of the current level.
Keywords :
cardiology; computerised tomography; image denoising; image motion analysis; image reconstruction; medical image processing; motion compensation; affine transformation; back-projection filtering; computed tomography; computer simulation; fan-beam reconstruction; heart; image artifact; motion artifact; motion compensation; nonrigid transformation; Biomedical imaging; Cardiac disease; Computed tomography; Filtering; Heart; Image reconstruction; Motion estimation; Noise reduction; Radiology; X-ray imaging; Computed tomography; Computed tomography (CT); motion compensation; Algorithms; Artifacts; Humans; Imaging, Three-Dimensional; Mathematics; Motion; Myocardial Contraction; Phantoms, Imaging; Radiation Dosage; Radiographic Image Interpretation, Computer-Assisted; Respiration; Scattering, Radiation; Signal Processing, Computer-Assisted; Time Factors; Tomography, X-Ray Computed; X-Rays;
Journal_Title :
Medical Imaging, IEEE Transactions on
DOI :
10.1109/TMI.2008.925076
