Mr imaging with partial k-space acquisition using spiral scanning
OwnerHarvey Ellis Cline, Sarah Kathryn Patch +2inventors
InventorsHARVEY ELLIS CLINE, SARAH KATHRYN PATCH, CHRISTOPHER JUDSON HARDY, WILLIAM ALAN EDELSTEIN
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Abstract
An MRI system acquires image data using a spiral pulse sequence in which k-space is sampled in a trajectory comprised of a spiral segment and a symmetric spiral tail segment. The spiral segments partially sample throughout the extent of k-space and the symmetric spiral tail segment samples only in a central region of k-space. The central region of k-space is fully sampled and a phase correction method is used to reconstruct an image from the under-sampled peripheral k-space data set.
Claims14
A method for producing an image with a magnetic resonance imaging system, comprising:
- a) establishing a polarizing magnetic field in a subject to be imaged;
- b) generating an RF excitation pulse to produce transverse magnetization in the subject;
- c) applying magnetic field gradients to the subject during an acquisition period such that k-space is sampled in a trajectory comprised of a spiral segment that extends from the center of k-space to the periphery of k-space, and a symmetric, spiral tail segment that extends from the center of k-space to sample only a central region of k-space;
- d) acquiring an NMR signal during the acquisition period;
- and
- e) reconstructing an image from the acquired NMR signal.
A magnetic resonance imaging system, comprising:
- a magnet system for producing a polarizing magnetic field in a subject;
- means for producing an RF excitation pulse to establish transverse magnetization in the subject;
- a magnetic field gradient assembly for applying to the subject during an acquisition period time varying magnetic field gradients to sample k-space in a trajectory comprised of a spiral segment that extends from the center of k-space to the periphery of k-space, and a symmetric, spiral tail segment that extends from the center of k-space to sample only a central region of k-space;
- a receiver for acquiring an NMR signal during the acquisition period;
- and
- means for reconstructing an image from the acquired NMR signal.
Dependencies are inferred from the claim text.