title: Deblurring for non-2D Fourier transform magnetic resonance imaging.
abstract: For several non-2D Fourier transform imaging methods, off-resonant reconstruction does not just cause geometric distortion, but changes the shape of the point spread function and causes blurring. This effect is well known for projection reconstruction and spiral k-space scanning sequences. We introduce here a method that automatically removes blur introduced by magnetic field inhomogeneity and susceptibility without using a resonant frequency map, making these imaging methods more useful. In this method, the raw data are modulated to several different frequencies and reconstructed to create a series of base images. Determination of degree of blur is done by calculating a focusing measure for each point in each base image and a composite image is then constructed using only the unblurred regions from each base image. This method has been successfully applied to phantom and in vivo images using projection-reconstruction and spiral-scan sequences.
authors.affiliation: Department of Electrical Engineering, Stanford University, California 94305.
authors.forename: D C
authors.initials: DC
authors.lastname: Noll
authors.forename: J M
authors.initials: JM
authors.lastname: Pauly
authors.forename: C H
authors.initials: CH
authors.lastname: Meyer
authors.forename: D G
authors.initials: DG
authors.lastname: Nishimura
authors.forename: A
authors.initials: A
authors.lastname: Macovski
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008961:Models, Structural