Digital nuclear magnetic resonance radio-frequency amplifier and realization method thereof

Abstract

The invention discloses a digital nuclear magnetic resonance radio-frequency amplifier which comprises a digital signal processor, a fundamental radio frequency power amplifier matrix and a high-power power synthesizer, wherein the digital signal processor comprises a radio-wave frequency input interface, a signal processing module connected with the radio-wave frequency input interface, and n interface components connected with the signal processing module; the fundamental radio frequency power amplifier matrix comprises n fundamental radio frequency power amplifiers connected with the interface components correspondingly; the high-power power synthesizer comprises n synthesis input interfaces connected with the fundamental radio frequency power amplifiers correspondingly, synthesis units connected with the synthesis input interfaces and synthesis output ends connected with the synthesis units, wherein n is a natural number which is equal to or larger than 1. The invention further discloses a realization method of the digital nuclear magnetic resonance radio-frequency amplifier. By adoption of a digital signal processing and modular structure, the design is simplified greatly, the large-scale production is convenient, the product flexibility is improved, and the product cost is greatly reduced at the same time.

Description

technical field [0001] The invention relates to a digital nuclear magnetic resonance radio frequency amplifier and a realization method thereof. Background technique [0002] The basic principle of nuclear magnetic resonance imaging equipment (MRI) is to let the human body enter the magnetic field for magnetization, and then emit a series of radio frequency pulse signals of a specific frequency. When the magnetic moment deflection occurs, when the radio frequency signal stops, the hydrogen nuclei at the site to be tested will release the absorbed energy in the form of electromagnetic signals, and the detection equipment will receive the signals for processing and imaging. [0003] As a key component of MRI equipment, radio frequency amplifiers transmit radio frequency pulse signals with various flip angles and different powers according to the requirements of the scanning sequence specified by the system. Any MRI equipment must be equipped with a corresponding radio frequenc...

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Problems solved by technology

[0004] The existing RF amplifiers have the following disadvantages: 1) The efficiency of the power amplifier is low. Since the envelope tracking technology is not used, the same power supply voltage is used regardless of whether the signal amplitude is strong or weak, resulting in power amplifier power consumption when small signal input Wasteful, but also need to use water cooling; 2) A large number of analog circuit designs, the consistency and temperature stability of its devices are poor, making the compensation circuit too complicated and product reliability reduced; 3) The power synthesis efficiency is low, on the one hand due to the power The inconsistency of the amplitude and phase shift of each power amplifier channel before synthesis leads to low efficiency of power synthesis; on the other hand, the loss of the lumped parameter power synthesizer currently used is large, resulting in power loss

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