title: Study of the Usefulness of the 3D-distortion Correction in MRI.
abstract: Static magnetic field non-uniformity and gradient magnetic field non-linearity can be considered as the causes of geometric distortion in MRI images. The impact of a distortion in imaging such as whole body imaging or whole spine imaging can be serious. A standard 2D-distortion correction method does not correct the distortion in the slice encoding direction. This study examined the effect of 3D-distortion correction with a correction effect in both the imaging plane and the slice-encoding plane using three MRI devices with differing static magnetic field intensities and boa diameters. Imaging of a nickel sulfate bottle phantom attached to the MRI device was conducted using a CT scan to measure the distortion rate based on the CT image. The result of the distortion rate at -39.1% in the Z-axis direction was reduced to -1.3%, and the distortion rate at about -9.8% in the magnetic X-axis was reduced to -1.7%. In addition, the reduction effect was greater on the 70 cm boa device compared to the 60 cm boa device, and it was also greater at 1.5 T compared to 3 T. 3D-distortion correction is believed to be useful for wide scope imaging using large FOV.
authors.affiliation: Department of Radiologic Technology, Toyama City Hospital.
authors.forename: Shino
authors.initials: S
authors.lastname: Yasuda
authors.forename: Kazunori
authors.initials: K
authors.lastname: Yamakoshi
mesh_terms: D006801:Humans; D021621:Imaging, Three-Dimensional / Q000295:instrumentation / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D013131:Spine / Q000000981:diagnostic imaging