title: Noise Power Spectrum in PROPELLER MR Imaging.
abstract: The noise power spectrum (NPS), an index for noise evaluation, represents the frequency characteristics of image noise. We measured the NPS in PROPELLER (Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction) magnetic resonance (MR) imaging, a nonuniform data sampling technique, as an initial study for practical MR image evaluation using the NPS. The 2-dimensional (2D) NPS reflected the k-space sampling density and showed agreement with the shape of the k-space trajectory as expected theoretically. Additionally, the 2D NPS allowed visualization of a part of the image reconstruction process, such as filtering and motion correction.
authors.affiliation: Health Sciences, Tohoku University Graduate School of Medicine.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Ichinoseki
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Nagasaka
authors.forename: Kota
authors.initials: K
authors.lastname: Miyamoto
authors.forename: Hajime
authors.initials: H
authors.lastname: Tamura
authors.forename: Issei
authors.initials: I
authors.lastname: Mori
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Machida
mesh_terms: D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D009038:Motion; D009622:Noise; D019047:Phantoms, Imaging