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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

Inactive Publication Date: 2010-03-31
NAT RES COUNCIL OF CANADA
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Problems solved by technology

No method for spatially selective excitation within the sample volume is taught and no method is expected to be used in the limited resolution NMR setup demonstrated in the '973 patent

Method used

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  • RF based spatially selective excitation in mri
  • RF based spatially selective excitation in mri
  • RF based spatially selective excitation in mri

Examples

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Embodiment Construction

[0050] Herein, a method for slice selection in MRI processing is provided, which method comprises shifting the k-space weighting function by adding weights in one or more B1 fields used to deposit energy according to the desired k-space weighting function. Low flip angle RF pulses interspersed between focused pulses control the transmit array. The low flip pulse deposits energy such that if the phase encoding direction is a linear axis that coordinates the sample volume and the B1 field has a linear phase gradient, then the envelope described by the low flip pulse in the k-space weighting function, e.g. The lines relate to the desired spatially excited regions of the sample volume.

[0051] Here, mathematically idealized terms are used to represent the orientation and properties (constant, linear, uniform) of the fields and the array of coils or elements used to generate them. Those skilled in the art will appreciate that in the context of the examples, any idealization is in...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54G01R33/32
CPCG01R33/4833G01R33/4831G01R33/34076G01R33/3415G01R33/3607
Inventor J·沙而普S·金
Owner NAT RES COUNCIL OF CANADA
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