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Radio-frequency pulse synthesis method in magnetic resonance image-forming system

A magnetic resonance imaging and radio frequency pulse technology, which is used in magnetic resonance measurement, material analysis through resonance, and applications. It can solve the problems of complex hardware design, the radio frequency waveform is easily affected by hardware errors, and the portability is poor, so as to avoid hardware Design, frequency accuracy, and usable effects

Active Publication Date: 2009-01-07
XINGAOYI MEDICAL EQUIP CO LTD
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Problems solved by technology

These methods require complex hardware design, poor portability, and the generated RF waveforms are easily affected by hardware errors

Method used

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  • Radio-frequency pulse synthesis method in magnetic resonance image-forming system
  • Radio-frequency pulse synthesis method in magnetic resonance image-forming system
  • Radio-frequency pulse synthesis method in magnetic resonance image-forming system

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] Such as figure 1 As shown, the magnetic resonance imaging system includes a radio frequency pulse generator and a pulse sequence controller used to generate a trigger signal to start the radio frequency pulse generator. The synthesis method of radio frequency pulses in the embodiment of the present invention is firstly based on the selected imaging pulse sequence and sequence Parameters, select the baseband signal function, establish the digital waveform of the digital baseband signal of the I channel and the Q channel, then calculate the center frequency of the radio frequency pulse, calculate and form the digital carrier signal sequence sin(nτw 0 ) and cos(nτw 0 ), after performing quadrature amplitude modulation on the carrier signal, a digital radio frequency signal is generated. Then download the digital radio frequency signal to...

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Abstract

The invention relates to a synthetic method used for a radio frequency pulse in a magnetic resonance imaging (MRI) system. The synthetic method comprises procedures as follows: (1) the center frequency omega0 of the radio frequency pulse is calculated based on the magnetic field intensity of the MRI system and the location of a selective zone; (2) two orthogonal simulative sine or cosine signals of the frequency with one center frequency omega0 is sampled so as to acquire digital carrier signal sequence S(n); (3) a digital baseband signal is calculated based on the bandwidth of a baseband signal; (4) the digital baseband signal is used for modulating a carrier and a digital radio-frequency signal is acquired; and (5) the acquired digital radio-frequency signal is downloaded onto the memory of a hardware to be stored; and after a trigger signal is sent by a pulse sequence controller, the digital radio-frequency signal is output after D / A conversion is performed. Compared with the prior art, the synthetic method can avoid complex hardware design and generate accurate waveform. In addition, the accuracy of the radio-frequency waveform is greatly improved; usability is good and the radio-frequency waveform is slightly affected by hardware error.

Description

technical field [0001] The invention relates to a method for synthesizing radio frequency pulses in a magnetic resonance imaging system. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, hereinafter referred to as MRI) is an emerging medical imaging method. It uses a magnetic field and radio frequency pulses to make hydrogen nuclear resonance in a living body generate a signal, which is processed by a computer to form an image. From the successful development of the world's first whole-body magnetic resonance imaging system in 1977 to the present, after 30 years of development, the performance of the MRI system has been continuously improved and the technology has been continuously improved. Due to its high resolution, multiple imaging parameters, tomographic imaging at any level, and no ionizing radiation damage, MRI has become one of the most advanced and widely used tools in imaging examinations, and is widely used in clinical research ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/20A61B5/055
Inventor 周荷琴谭裴潘文宇李璟朱剑锋
Owner XINGAOYI MEDICAL EQUIP CO LTD
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