Magnetic Resonance Method for the Detection and Imaging of Susceptibility Related Magnetic Field Distortions
First Claim
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1. A method of magnetic resonance imaging (MRI) comprising:
- providing a non-balanced steady state fee precession (SSFP) protocol in which spins are dephased so that signal(s) are suppressed in an MRI image,subjecting material having magnetic susceptibility to said non-balanced SSFP protocol, wherein said material causes a local magnetic field distortion generating local field gradients,wherein said local field gradients compensate for said dephased spins locally so that said dephased spins are rephased to provide a local signal.
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Abstract
Disclosed are methods and apparatuses for generating susceptibility-related contrast images, as induced, e.g., by marker material interventional devices used for passive MR-guided interventions, or by particles or cells loaded with marker materials used for molecular imaging, cell-tracking or cell-labeling. Near a local magnetic field perturber a positive contrast signal emanates from local gradient compensation to form, e.g., a balanced SSFP type of echo, whereas everywhere else echoes are shifted outside of the data acquisition window.
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15 Claims
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1. A method of magnetic resonance imaging (MRI) comprising:
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providing a non-balanced steady state fee precession (SSFP) protocol in which spins are dephased so that signal(s) are suppressed in an MRI image, subjecting material having magnetic susceptibility to said non-balanced SSFP protocol, wherein said material causes a local magnetic field distortion generating local field gradients, wherein said local field gradients compensate for said dephased spins locally so that said dephased spins are rephased to provide a local signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification