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US 7,116,104 B2Granted
Reduced specific absorption ratio T1ρ-weighted MRI
AssigneeThe Trustees of the University of Pennsylvania
InventorsRavinder Reddy, Ari Borthakur, Andrew J. Wheaton, Sridhar R. Charagundla
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Abstract
Provided is a T1ρ-weighted pulse sequence with reduced specific absorption rate for magnetic resonance imaging (MRI). Also provided is a method of reducing the specific absorption rate in T1ρ-weighted MRI.
Claims7
A T1ρ-weighted pulse sequence with reduced specific absorption rate for magnetic resonance imaging, comprising:
- a pre-encoded spin-lock pulse cluster, further comprising two nonselective pulses separated by a spin-lock pulse having an amplitude;
- phase-encoded lines in a k-space, wherein the k-space has at least two portions, generally separated into a central portion and a remaining portion, and wherein the central portion is a fraction of the k-space;
- a high power amplitude spin-lock pulse applied for the phase-encoded lines in the central portion of k-space;
- and
- lower amplitude, and therefore lower power, spin-lock pulse amplitudes applied for the remaining portion(s) of the k-space.
2 more elements
A method of reducing specific absorption rate in T1ρ-weighted imaging, comprising:
- applying a full amplitude spin-lock pulse for a fraction of a k-space, wherein the k-space comprises at least two portions, a central portion and a remaining portion, and wherein the fraction is the central portion of the k-space;
- and
- applying lower amplitude, and therefore lower power, spin-lock pulse for the remaining portion of the k-space.
Dependencies are inferred from the claim text.