title: A method of switching the signal in an MRI phantom based on trace ion currents.
abstract: A method for electrically changing the hydrogen nuclear magnetic resonance (NMR) signal intensity in a magnetic resonance imaging (MRI) phantom is presented. The method is based on creating local magnetic field inhomogeneities from impurity ion currents in a polar hydrocarbon. The effect is demonstrated using the propylene carbonate on an NMR spectrometer and an MRI scanner. This effect is largest when the electric field is applied perpendicular to the static magnetic field in magnetic resonance, and is linear with applied voltage. The applicability of a switchable signal in an MRI phantom is demonstrated with a spin-echo, echo planar imaging sequence where the MRI signal is changed between blocks of 10 images in a series of 200 images. This technique may find applications in inter and intra platform fMRI quality control.
authors.affiliation: Magnetic Resonance Laboratory, Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623, United States.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Qiu
authors.affiliation: Department of Imaging Sciences, University of Rochester Medical Center, Rochester, NY 14642, United States.
authors.forename: WingChi Edmund
authors.initials: WE
authors.lastname: Kwok
authors.affiliation: Magnetic Resonance Laboratory, Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623, United States. Electronic address: jphsch@rit.edu.
authors.forename: Joseph P
authors.initials: JP
authors.lastname: Hornak
keywords: Electric-field NMR; Ion current; Magnetic resonance imaging; Quality control phantom