Tunable cylindrical metasurface device and preparation method for nuclear magnetic resonance imaging

Abstract

The invention discloses a tunable cylindrical metasurface device for nuclear magnetic resonance imaging and a preparation method thereof, wherein the device includes: a printed circuit board, a variable capacitor, an annular guide piece and a cylindrical support, wherein the printed circuit board includes a dielectric The plate and the first electrode and the second electrode respectively located at the front and back of the dielectric plate, and the orthographic projection of the second electrode on the dielectric plate are located at the two ends of the orthographic projection of the first electrode on the dielectric plate to form a parallel plate capacitor; The variable capacitor is connected in parallel with the parallel plate capacitor; the first annular guide piece and the second annular guide piece are arranged at both ends of the device, and the first annular guide piece and the second annular guide piece are respectively connected to the second electrodes at both ends; the cylindrical bracket , for stabilizing and regularizing the printed circuit boards in a circumferential array and generating an imageable area. The design of the device is more in line with the shape of the human body, and can be applied to the MRI detection of the objects under test with different load effects.

Description

technical field [0001] The invention relates to the technical field of nuclear magnetic resonance imaging, in particular to a tunable cylindrical metasurface device and a preparation method for nuclear magnetic resonance imaging. Background technique [0002] MRI (Magnetic Resonance Imaging, nuclear magnetic resonance imaging technology) is a non-invasive detection method and is an important basic diagnostic technology in the fields of medicine, biology and neuroscience. The signal strength transmitted by traditional MRI equipment mainly depends on the static magnetic field B 0 The intensity of high magnetic field or even ultra-high magnetic field system can improve the image signal-to-noise ratio, resolution and shorten the scanning time. However, the increase in the strength of the static magnetic field will bring the following three problems: 1) the non-uniformity of the radio frequency (RF) field increases, and the tuning difficulty increases; 2) the heat production of ...

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Problems solved by technology

However, the increase in the strength of the static magnetic field will bring the following three problems: 1) the non-uniformity of the radio frequency (RF) field increases, and the tuning difficulty increases; 2) the heat production of human tissue increases, which brings safety hazards, and patients are prone to dizziness and Adverse reactions such as vomiting: 3) The purchase cost has increased significantly, which is a burden for most small-scale hospitals

[0006] However, the magnetic field distribution uniformity and frequency tuning mechanism of the currently proposed metasurface devices still need to be improved.

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