Controller and method for radio frequency transmission carrier frequency phase of nuclear magnetic resonance imaging spectrometer
A technology of nuclear magnetic resonance imaging and radio frequency emission, which is used in magnetic resonance measurement, instruments, sensors, etc., and can solve the problems of slow phase switching, poor phase accuracy, and small frequency adjustment range.
Active Publication Date: 2021-05-07
合肥菲特微电子技术有限公司
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[0013] Aiming at the deficiencies of the prior art, the present invention discloses a controller and method for the radio frequency transmission carrier frequency phase of a nuclear magnetic resonance imaging spectrometer, which can solve the problems of traditional radio frequency pulse signal frequency, slow phase switching speed, small frequency adjustment range, and phase accuracy. bad question
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[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. the embodiment.
[0050] Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0051] Such as figure 1 As shown, the controller of the radio frequency transmission carrier frequency phase of the nuclear magnetic resonance imaging spectrometer described in the embodiment of the present invention includes a field-programmable gate array (FPGA, Field-Programmable Gate Array) and a digital-to-analog converter (DAC, Digital to analog converter).
[0052] In Field Programmable Gate ...
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The invention discloses a controller and a method for a radio frequency emission carrier frequency phase of a nuclear magnetic resonance imaging spectrometer, and relates to the technical field of magnetic resonance. The carrier frequency and phase of the RF signal are modulated twice, and the offset frequency required for layer selection and the phase used to modulate the RF signal are generated in the digitally controlled oscillator NCO in the field programmable gate array FPGA. The system center frequency is generated in the digitally controlled oscillator NCO within the DAC. The invention can solve the problems of traditional spectrometer radio frequency pulse signal frequency, slow phase switching speed, small frequency adjustment range and poor phase precision.
Description
technical field [0001] The invention relates to the field of magnetic resonance technology, in particular to a controller and method for radio frequency transmission carrier frequency phase of a nuclear magnetic resonance imaging spectrometer. Background technique [0002] Magnetic resonance imaging (MRI), as a non-invasive diagnostic method that can reflect multi-dimensional information, has been widely used in medical pathological diagnosis and basic scientific research. The nuclear magnetic resonance spectrometer is the core component of the nuclear magnetic resonance imaging system, and its main function is to control the emission of pulse sequences and the reception of magnetic resonance signals in real time. [0003] The radio frequency pulse is used to excite the magnetic nucleus (such as hydrogen) in the magnetic field to make it resonate. The resonance condition is: [0004] ω 0 =γB 0 [0005] The above formula is the famous Larmor's theorem. where B 0 is the ...
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IPC IPC(8): G01R33/36A61B5/055
CPCA61B5/055G01R33/3607
Inventor 赵科吴端
Owner 合肥菲特微电子技术有限公司