Magnetic resonance system and imaging method thereof

Abstract

The invention discloses a magnetic resonance system imaging method, which comprises the following steps: under a multichannel emission mode, according to spin echo signal intensity SSE and stimulated echo signal intensity SSTE, carrying out optimization on amplitude and phase parameters of a plurality of radio frequency emission channels to generate a target B1 field, wherein the target B1 field meets B1 field uniformity and radio frequency emission power optimization simultaneously; loading the optimized amplitude and phase parameters to a radio frequency pulse controller, and driving the plurality of radio frequency emission channels to generate the target B1 field; under the target B1 field, exciting a part to be scanned of a subject to obtain a magnetic resonance signal of the part to be scanned; and carrying out Fourier transform on the magnetic resonance signal to obtain a magnetic resonance image of the part to be scanned. The spin echo signal intensity and the stimulated echo signal intensity are collected to reflect distribution of the B1 field; and fast correction can be carried out to obtain a uniform B1 field, and radio frequency emission power can be corrected. The invention also provides a magnetic resonance system.

Description

【Technical field】 [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to technologies related to radio frequency field optimization. 【Background technique】 [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) technology is a non-invasive detection technology produced with the development of computer technology, electronic circuit technology, and superconductor technology. It is extremely important in today's clinical diagnosis and medical research. meaning. The basic process of magnetic resonance imaging is: the transmitting unit generates a radio frequency field perpendicular to the main magnetic field of the scanning device, and the radio frequency pulse energy makes the resonant nucleus spin in the human body. At this time, the human body is equivalent to a receiver and is accurately tuned to the resonance frequency After the radio frequency pulse stops, the protons in the irradiated part of the human body gra...

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Problems solved by technology

where enlarging the coil geometry increases the B 1 While improving the uniformity of the field, it will increase the coil loss and reduce the fill factor, and because the amount of tissue contained in the coil increases, it will also form an additional noise source, although B 1 The enhancement of field uniformity is accompanied by the reduction of Signal Noise Ratio (S/N); the multi-channel parallel transmission technology is mainly based on the B of all single transmission channels. 1 Field adjustment of the amplitude and phase optimization of each channel B 1 The uniformity of the field, how

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