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Method of performing magnetic resonance imaging of the body and magnetic resonance imaging scanner

An MRI, body technology, applied in the field of medical imaging, can solve the problems of high power, useless final image, long duration of adiabatic pulse, etc., to avoid related costs, good performance, and avoid the effect of increase

Inactive Publication Date: 2016-07-06
COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The same problem occurs with compound pulses: the adiabatic pulse requires a long duration and high power
[0011] Lack of spatial selectivity means that 3D readout techniques are required to obtain artifact-free images and avoid aliasing or folding effects, which would render the final image useless

Method used

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  • Method of performing magnetic resonance imaging of the body and magnetic resonance imaging scanner
  • Method of performing magnetic resonance imaging of the body and magnetic resonance imaging scanner
  • Method of performing magnetic resonance imaging of the body and magnetic resonance imaging scanner

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Embodiment Construction

[0055] As known in the prior art, e.g. according to the above-mentioned document WO2009 / 053770, a strong modulation pulse consists of a series of N durations τ i The fundamental RF pulse consists of a fundamental RF pulse with a constant angular frequency ω i and amplitude A i , and the continuous phase where i = 1 - N. Figure 1A with Figure 1B The time-dependent amplitude and phase of such a pulse consisting of N=3 elementary pulses or "sub-pulses" are shown. It should be understood that the high modulation pulse consists of a set of 4N parameters Fully qualified, where i=1-N. The values ​​of these parameters are chosen to obtain relatively consistent spin flip angles despite the inevitable B 0 Inhomogeneity and B 1 unevenness. The design of heavily modulated pulses is simplified by the fact that at the duration τ of each elementary pulse i In , the phase of the RF field varies linearly with time, Thus, there exists an analytical solution to the Schrödinger equa...

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Abstract

A method for performing the body's magnetic resonance imaging, which includes: placing the body into the static magnetic field to directed the nucleus along the magnetized axis;Selective stimulation of the slices of nuclear spin, so that the nucleus spin of the atom containing the atom containing the body;The nuclear magnetic resonance image of the slice; the characteristics of the method are: the radio frequency pulse is composed of a series of slices selective basic pulse; a series of slicing basic pulse is equivalentThe rectangular pulse, the basic rectangular pulse is designed to be designed to compensate the unevenness of the radio frequency field in the body.

Description

technical field [0001] The present invention relates to a method for correcting radio frequency (or "B" in slice-selective MRI) 1 ”) method of spatial inhomogeneity. The invention also relates to a device or “scanner” for performing such a method. The invention finds particular but not exclusive application in the field of medical imaging. Background technique [0002] Magnetic resonance imaging (MRI) is a very powerful tool in research and diagnosis. It includes: placing the body in a static magnetic field B 0 to orient its nuclear spins; expose the body to a transverse radio frequency (RF) field at a resonant frequency known as the "Larmor frequency"B 1 (excitation sequence) to flip said nuclear spins by a predetermined angle; and detecting signals emitted by the flipped nuclear spins from which an image of the body can be reconstructed. [0003] The current trend is towards higher and higher strength static magnetic fields to improve the spatial resolution of MRI. For...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/54
CPCG01R33/4833G01R33/5612G01R33/56563G01R33/5659A61B5/055G01R33/4831G01R33/4835
Inventor 尼古拉斯·布朗
Owner COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES