title: Prospective adaptive navigator correction for breath-hold MR coronary angiography.
abstract: Current MR coronary angiography (MRCA) methods use breath-holding to minimize respiratory motion. A major limitation to this technique is misregistration between imaging slices due to breath-hold variability. Prospective adaptive correction of image location using real-time navigator measurement of diaphragm position is a potential method for improving slice registration in breath-hold MRCA. Ten subjects underwent MRCA using an ECG-gated, fat-suppressed, segmented k-space, gradient-echo sequence. Transverse and coronal images were acquired using standard breath-holding with and without prospective navigator correction. Breath-hold MRCA with prospective navigator correction resulted in a 47% reduction in craniocaudal slice registration error compared to standard breath-holding (0.9 +/- 0.2 mm versus 1.7 +/- 0.4 mm, P = 0.04). Prospective adaptive navigator correction of image location significantly improves slice registration for breath-hold MRCA and is a promising motion correction technique for cardiac MR.
authors.affiliation: Department of Medicine, Cardiovascular Division, Beth Israel Hospital, Boston, Massachusetts 02215, USA.
authors.forename: M V
authors.initials: MV
authors.lastname: McConnell
authors.forename: V C
authors.initials: VC
authors.lastname: Khasgiwala
authors.forename: B J
authors.initials: BJ
authors.lastname: Savord
authors.forename: M H
authors.initials: MH
authors.lastname: Chen
authors.forename: M L
authors.initials: ML
authors.lastname: Chuang
authors.forename: R R
authors.initials: RR
authors.lastname: Edelman
authors.forename: W J
authors.initials: WJ
authors.lastname: Manning
mesh_terms: D000328:Adult; D016477:Artifacts; D003331:Coronary Vessels / Q000033:anatomy & histology*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012119:Respiration