Digital radio-frequency receiver for magnetic resonance imaging system and signal processing method thereof
A magnetic resonance imaging and magnetic resonance signal technology, applied in magnetic resonance measurement, applications, sensors, etc., can solve the problems of demodulation phase artifacts, imaging quality impact, gain imbalance, etc., and achieve small hardware error impact, filtering and The extraction method is easy to avoid the effect of analog circuit design
Active Publication Date: 2011-04-27
鑫高益医疗设备股份有限公司
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Problems solved by technology
Traditional analog RF receivers are designed with analog hardware circuits. During analog demodulation, gain imbalance or phase error between two channels will cause demodulation phase artifacts; errors in mixers, amplifiers and filters It is also prone to image artifacts; in addition, the nonlinear drift of analog devices can also adversely affect image quality
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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0035] The invention provides a digital radio frequency receiver for a magnetic resonance imaging system and a signal processing method thereof. The digital radio frequency receiver includes an A / D data acquisition board, a first digital quadrature mediation module, a second digital quadrature A mediation module, a first m-level wavelet decomposition module, a second m-level wavelet decomposition module, a first FIR filter, a second FIR filter and a K-space data construction module.
[0036] Among them, the A / D data acquisition board is used to collect and A / D convert the analog magnetic resonance signals transmitted through the receiving coil and preamplifier in the magnetic resonance imaging system, so as to obtain digital magnetic resonance signals, which are related to magnetic resonance imaging. connected to the output of the preamplifier...
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The invention relates to a digital radio-frequency receiver for a magnetic resonance imaging system and a signal processing method thereof. The digital radio-frequency receiver comprises an analog to digital (A / D) data acquisition board card, a first digital orthogonal modulation module, a second digital orthogonal modulation module, a first m-level wavelet decomposition module, a second m-level wavelet decomposition module, a first finite impulse response (FIR) filter, a second FIR filter, and a K spatial data structure module. Compared with the prior art, the digital radio-frequency receiver has the advantages that the fussy analog circuit design is avoided, a digital orthogonal demodulation method ensures that the unbalance and frequency spectrum distortion of two-channel signals can be effectively reduced, simultaneously the filter and extraction method of digital signals is also easy to design; and in addition, for the method, the influence caused by hardware errors is less, and the portability is strong, therefore, the method can be matched with different A / D acquisition board cards for use.
Description
technical field [0001] The invention relates to a digital radio frequency receiver for a magnetic resonance imaging system and a signal processing method thereof. Background technique [0002] Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) is a high-tech in medical imaging. It uses a magnetic field and radio frequency pulses to make hydrogen nuclear resonance in a living body generate signals, which are processed by a computer to form an image. Since it came out in the 1970s, MRI technology has developed rapidly. Due to its high resolution, multiple imaging parameters, tomographic imaging at any level, and no ionizing radiation, it has become one of the most advanced tools in imaging examinations. Widely used in clinical examination of various systems of the human body. In 2003, Paul C. Lauterbur and Peter Mansfield, who invented magnetic resonance imaging, were awarded the Nobel Prize in Physiology or Medicine. [0003] The function of the magnetic resonance...
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Inventor 潘文宇罗海周荷琴李璟
Owner 鑫高益医疗设备股份有限公司