title: DC artifact correction for arbitrary phase-cycling sequence.
abstract: In magnetic resonance imaging (MRI), a non-zero offset in the receiver baseline signal during acquisition results in a bright spot or a line artifact in the center of the image known as a direct current (DC) artifact. Several methods have been suggested in the past for the removal or correction of DC artifacts in MR images, however, these methods cannot be applied directly when a specific phase-cycling technique is used in the imaging sequence. In this work, we proposed a new, simple technique that enables correction of DC artifacts for any arbitrary phase-cycling imaging sequences. The technique is composed of phase unification, DC offset estimation and correction, and phase restoration. The feasibility of the proposed method was demonstrated via phantom and in vivo experiments with a multiple phase-cycling balanced steady-state free precession (bSSFP) imaging sequence. Results showed successful removal of the DC artifacts in images acquired using bSSFP with phase-cycling angles of 0°, 90°, 180°, and 270°, indicating potential feasibility of the proposed method to any imaging sequence with arbitrary phase-cycling angles.
authors.affiliation: Magnetic Resonance Imaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.
authors.forename: Paul Kyu
authors.initials: PK
authors.lastname: Han
authors.affiliation: Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea.
authors.forename: HyunWook
authors.initials: H
authors.lastname: Park
authors.affiliation: Magnetic Resonance Imaging Laboratory, Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon, South Korea. Electronic address: sunghongpark@kaist.ac.kr.
authors.forename: Sung-Hong
authors.initials: SH
authors.lastname: Park
mesh_terms: D000818:Animals; D016477:Artifacts; D001921:Brain / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D004560:Electricity; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D023421:Models, Animal; D019047:Phantoms, Imaging; D051381:Rats; D017207:Rats, Sprague-Dawley; D012815:Signal Processing, Computer-Assisted
keywords: DC artifact; Phase cycling; bSSFP