RF based spatially selective excitation in mri

A selective and spatial technology, applied in magnetic resonance measurement, instruments, measuring devices, etc., can solve problems such as methods that do not teach spatial selective excitation
CN101688909AInactive Publication Date: 2010-03-31NAT RES COUNCIL OF CANADA
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
NAT RES COUNCIL OF CANADA
Publication Date
2010-03-31
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

The invention relates to an RF based spatially selective excitation in MRI. Herein a method for slice selection is provided in an MRI process, the method involves controlling a transmit array by adding low flip angle RF pulses interspersed between refocusing pulses that are used to move a k-space weighting function with respect to one or more B l fields used to deposit energy according to a desired k-space weighting function. The low flip angle pulses deposit energy so that an envelope traced by the low flip angle pulses in the k-space weighting function is related to a desired spatially excited region of the sample volume, for example by a Fourier transform, if the phase encoding directions are linear axes that coordinatize the sample volume, and the Bl fields have linear phase gradients.
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Description

[0001] Cross References to Related Applications

[0002] This application claims U.S. Provisional Application Serial No. 60 / 924195 filed May 3, 2007 entitled "Method for Radio-Frequency Nuclear Magnetic Resonance Imaging" and filed April 18, 2008 entitled "RFBased Spatially Selective Excitation In MRI," US Provisional Application Serial No. 61 / 071269, both of which are hereby incorporated by reference in their entirety. technical field

[0003] The present invention relates generally to spatially selective excitation in magnetic resonance imaging (MRI) using RF pulses, and in particular to slices (or slices) using RF pulses without the use of conventional frequency gradient fields. other) method of choice. Background technique

[0004] The ability to excite a sample within a Sample Volume in a spatially selective manner is a fundamental technique for MRI imaging, and most MRI equipment is capable of doing so. For example, most common spatially selective excitation involve...

Claims

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