title: Prospective optical motion correction for 3D time-of-flight angiography.
abstract: Magnetic resonance angiograms are often nondiagnostic due to patient motion. In clinical practice, the available time to repeat motion-corrupted scans is very limited--especially in patients who suffer from acute cerebrovascular conditions. Here, the feasibility of an optical motion correction system to prospectively correct patient motion for 3D time-of-flight magnetic resonance angiography was investigated. Experiments were performed on five subjects with and without parallel imaging (SENSE R=2) on a 1.5 T unit. Two human readers assessed the data and were in good agreement (kappa: 0.77). The results from this study indicate that the optical motion correction system greatly reduces motion artifacts when motion was present and did not impair the image quality in the absence of motion. Statistical analysis showed no significant difference between the (vendor-provided) SENSE and the nonaccelerated acquisitions. In conclusion, the optical motion correction system tested in this study has the potential to greatly improve 3D time-of-flight angiograms regardless of whether it is used with or without SENSE.
authors.affiliation: Department of Radiology, Stanford University, Stanford, California 94305-5488, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Kopeinigg
authors.forename: Murat
authors.initials: M
authors.lastname: Aksoy
authors.forename: Christoph
authors.initials: C
authors.lastname: Forman
authors.forename: Matus
authors.initials: M
authors.lastname: Straka
authors.forename: Danielle
authors.initials: D
authors.lastname: Seaman
authors.forename: Jarrett
authors.initials: J
authors.lastname: Rosenberg
authors.forename: Dominik
authors.initials: D
authors.lastname: Fleischmann
authors.forename: Joachim
authors.initials: J
authors.lastname: Hornegger
authors.forename: Roland
authors.initials: R
authors.lastname: Bammer
mesh_terms: D016477:Artifacts; D001783:Blood Flow Velocity / Q000502:physiology; D001921:Brain / Q000502:physiology*; D002560:Cerebrovascular Circulation / Q000502:physiology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation*; D018810:Magnetic Resonance Angiography / Q000295:instrumentation*; D009038:Motion; D055096:Optical Devices; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity