Excitation Pulse Sequence Generator for Magnetic Resonance Systems

A technology of excitation pulse and magnetic resonance, which is applied in the direction of using nuclear magnetic resonance imaging system for measurement, magnetic resonance measurement, magnetic variable measurement, etc., to achieve the effect of reducing radio frequency energy, reducing amplitude, and improving sampling efficiency

Inactive Publication Date: 2011-12-21
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, in the imaging of a small-scale field of view (or small-scale FOV, FOV is the field of view), although the imaging time is shortened due to the undersampling of the imaging K-space, it also brings artifacts containing information of ot

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  • Excitation Pulse Sequence Generator for Magnetic Resonance Systems
  • Excitation Pulse Sequence Generator for Magnetic Resonance Systems
  • Excitation Pulse Sequence Generator for Magnetic Resonance Systems

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Embodiment Construction

[0034] The excitation pulse sequence generator of the present invention is suitable for a magnetic resonance system including radio frequency coils (such as array coils) with multiple transmission channels.

[0035] see figure 1 The magnetic resonance system used in the present invention generally includes a computer 100, a magnetic resonance scanning system 102, a scanning bed 112 that can adjust the position of the object under test, a B1+ mapping processor 114, a pulse sequence generator 116, a data acquisition unit 118, and a data processing unit 120 , a gradient drive unit 122 , a radio frequency drive unit 124 , a physiological information acquisition controller 126 , a scanning room interface unit 128 , a test object positioning system 130 and an external display 132 .

[0036] The magnetic resonance scanning system 102 mainly includes a main magnet 104 for generating a main magnetic field, a gradient coil 106 for generating a gradient magnetic field, and a radio freque...

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Abstract

The invention provides an excitation pulse sequence generator for a magnetic resonance system. An excitation pulse sequence generated by the excitation pulse sequence generator is applied to the magnetic resonance system, so that optimized three-dimensional space selective excitation based on a parallel excitation technology can be realized. By using the excitation pulse sequence generator, an appropriate excitation K space track can be determined in an optimized way according to an excitation target and the space sensitivity situation of a plurality of transmitting channels of a radiofrequency coil, so that a gradient pulse waveform and a radiofrequency pulse envelope waveform corresponding to each transmitting channel are determined. A gradient driving unit and a radiofrequency driving unit of the magnetic resonance system are used for generating gradient pulses and radiofrequency pulses accordingly and driving a gradient coil and the radiofrequency coil to apply the gradient pulsesand the radiofrequency pulses to a scanning space, so that the aim of selectively exciting in a desired three-dimensional space is fulfilled.

Description

technical field [0001] The invention relates to an excitation pulse sequence generator for a magnetic resonance system. Background technique [0002] When substances such as human tissue are placed in a uniform static magnetic field (B 0 field, that is, the main magnetic field), the direction of the proton magnetic moment in the tissue will tend to be in line with the B 0 The field is consistent and precesses along this direction at the Larmor frequency, so that the direction of the magnetization vector at this time is the positive direction of the z-axis, and the amplitude is M 0 , which means that the protons in the tissue are in equilibrium. If the direction and B are applied at this time 0 The field is vertical (that is, in the xy plane), and the radio frequency field close to the Larmor frequency (B 1 field), the magnetization vector inside the tissue will rotate to the xy plane, and its trajectory is in the same position as B 1 In the plane perpendicular to the fi...

Claims

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Application Information

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IPC IPC(8): G01R33/36G01R33/54
Inventor 夏灵邵汀汀刘锋
Owner ZHEJIANG UNIV
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