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US 5,485,086 AGranted
Continuous fluoroscopic MRI using spiral k-space scanning
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorsCraig H. Meyer, Albert Macovski
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Abstract
Continuous fluoroscopic data is acquired using magnetic resonance imaging by applying magnetic gradients to excited nuclei whereby emitted magnetic resonance signals traverse interleaved spirals in k-space. The spirals can have tighter loops near the origin of k-space to emphasize lower frequencies.
Claims12
A method of acquiring continuous fluoroscopic data using magnetic resonance imaging comprising the steps of
- a) placing an object in a magnetic field,
- b) exciting nuclei in said object with an RF excitation pulse,
- c) applying magnetic gradients to said object whereby magnetic resonance signals emitted from said excited nuclei traverse a spiral in k-space,
- d) detecting magnetic resonance signals emitted from said exited nuclei,
- e) repeating steps b), c) and d) at different initial trajectories to create an interleaved set of spirals in k-space, and
- f) forming a fluoroscopic image based on said magnetic resonance signals.
3 more elements
Apparatus for acquiring continuous fluoroscopic data using magnetic resonance imaging comprising
- a) means for establishing a static magnetic field through an object,
- b) means for exciting nuclei in said object with RF excitation pulses,
- c) means for applying magnetic gradients to said object whereby magnetic resonance signals emitted from said excited nuclei traverse a spiral in k-space,
- d) means for detecting magnetic resonance signals emitted from said exited nuclei,
- e) said means for exciting and said means for applying magnetic gradients providing different initial trajectories to create an interleaved set of spirals in k-space, and
- f) means for forming a fluoroscopic image based on said magnetic resonance signals.
3 more elements
Dependencies are inferred from the claim text.