Excitation Pulse Sequence Generator for Magnetic Resonance Systems

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...

AI Technical Summary

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 other parts; Through the selective excitation of the three-dimensional body, the protons in the small range of FOV are selectively excited, and there will be no artifacts from the interference of excited protons in other parts of the imaging results.

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