Method and apparatus of M/r imaging with coil calibration data acquisition
AssigneeGeneral Electric Company
InventorsKevin F. King, Elisabeth Angelos, Jason A. Polzin
Life of this patent
Estimating the term…
Abstract
A system and method for MR imaging with coil sensitivity or calibration data acquisition for reducing wrapping or aliasing artifacts is disclosed. Low resolution MR data representative of coil sensitivity of a coil arrangement within an FOV is acquired prior to application of an imaging data acquisition scan and is used to reduce wrapping or aliasing artifacts in a reconstructed image.
Claims33
A method of MR imaging comprising the steps of:
- defining a calibration FOV and an image FOV relative to a multi-coil arrangement, wherein the calibration FOV is different from the image FOV;
- repeatedly applying an imaging sequence to acquire MR imaging data from the image FOV for image reconstruction;
- and
- playing out before at least one application of the imaging sequence a calibration sequence to acquire data of coil sensitivity from the calibration FOV.
An MRI apparatus comprising:
- a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet configured to impress a polarizing magnetic field and an RF transceiver system and an RF switch controlled by a pulse module to transmit RF signals to an RF coil assembly to acquire MR images, the RF coil assembly including an array of RF coils;
- and
- a computer programmed to:
- apply a navigated calibration pulse sequence to acquire calibration data from a region corresponding to a spatial coverage of the array of RF coils, the calibration data indicative of B1 field strength across the spatial coverage;
- apply a parallel imaging sequence to acquire MR data for image reconstruction from an image FOV that is smaller in spatial coverage than the spatial coverage of the array of RF coils;
- and
- reconstruct an image of a subject from MR data acquired from the array of RF coils and use the calibration data to reduce aliasing in the image.
A computer readable storage medium having a computer program stored thereon and representing a set of instructions that when executed by a computer causes the computer to:
- define an FOV;
- play out a calibration sequence to acquire low resolution MR data from within the FOV and from outside the FOV, the low resolution MR data being indicative of field strength sensitivities in an array of surface coils;
- apply an imaging sequence after application of the calibration sequence to acquire imaging data from the FOV with the array of surface coils;
- and
- reduce artifacts in the imaging data caused by the field strength sensitivities.
Dependencies are inferred from the claim text.