title: Motion compensated fan-beam reconstruction for nonrigid transformation.
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 backprojection 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.
authors.affiliation: Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, 601 N. Caroline Street, Baltimore, MD21287, USA. ktaguchi@ jhmi.edu
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Taguchi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kudo
mesh_terms: D000465:Algorithms; D016477:Artifacts; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008433:Mathematics; D009038:Motion; D009200:Myocardial Contraction; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D012119:Respiration; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods; D014965:X-Rays