Electron paramagnetic resonance cavity for in-vivo measurement of human teeth

A magnetic resonance resonant cavity and resonant cavity technology, applied in diagnostic recording/measurement, application, dentistry, etc., to achieve the effects of easy processing and production, reduced impact, and small size

Active Publication Date: 2012-09-12
INST OF RADIATION MEDICINE ACAD OF MILITARY MEDICAL SCI OF THE PLA
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Problems solved by technology

Due to the experimental conditions and sampling problems, this method has great limitations in practical application.

Method used

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  • Electron paramagnetic resonance cavity for in-vivo measurement of human teeth
  • Electron paramagnetic resonance cavity for in-vivo measurement of human teeth

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Experimental program
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Embodiment Construction

[0012] The inner diameter of the cavity is 22 mm, the inner height of the cavity is 28.2 mm, the thickness of the cavity is 1.5 mm, the structural material of the cavity is copper, and the surface is plated with silver. The long side dimension of the rectangular longitudinal through opening of the detection port is 10 mm, and the short side is 3 mm, and the detection port is chord-wise connected with the cavity wall. The modulation coil is fixed at 5cm on both sides of the center of the detection port, and a 100K Hz modulation current is applied. The cavity is connected with the microwave system of the Bruker-A300 paramagnetic resonance spectrometer through the deployment unit and the waveguide. The microwave resonant frequency is 9.55G Hz, and the microwave field type in the cavity is TE111. The practical application effect is as follows: using the chamber of the present invention to detect diphenylpicrylhydrazine free radical (DPPH) spot samples, good EPR spectral lines can ...

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Abstract

The invention relates to an electron paramagnetic resonance cavity capable of measuring human teeth in vivo. The resonance cavity is in a cylindrical shape, a rectangular detection port is arranged on the lateral face of a cavity body and penetrates along the lateral face of the cylinder in a chordwise mode, and the long side of the rectangular detection port is perpendicular to the direction where microwave magnetic-field components in the resonance cavity are located and is parallel to the direction of a current line located on the cavity wall. A pair of modulating coils is arranged on two sides of the detection point to enable the magnetic field modulation to work in the detection port. An allocation bolt outside a coupling hole is utilized to achieve coupling regulation between the cavity body and a microwave system. The whole structures of the resonance cavity and a coupling unit are made of brass. The electron paramagnetic resonance cavity is mainly used for in-vivo electron paramagnetic resonance (EPR) measurement of human teeth, achieves quick estimation of radiation dosage, and can implement paramagnetic resonance detection on samples which cannot be placed in the resonance cavity conveniently due to large volume or of which integral structures are not suitable for being damaged outside the cavity.

Description

technical field [0001] The invention relates to an electron paramagnetic resonance detection device, in particular to an electron paramagnetic resonance resonant cavity capable of measuring human teeth in vivo. The volume and shape of this specially designed resonant cavity are suitable for being placed in the human oral cavity for direct detection of teeth, so as to obtain the electron paramagnetic resonance spectrum of enamel samples. The technical field is new technologies and methods of biophysics. Background technique [0002] Electron paramagnetic resonance (EPR for short) is a technique used to detect the Zeeman energy level transition of the spin magnetic moment of uncoupled electrons in matter. This technique can be used to analyze the content and properties of paramagnetic centers such as free radicals, transition metal elements, and lattice defects contained in substances. Therefore, EPR is widely used in many fields such as physics, chemistry, geology, archaeolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C19/04A61B5/055
Inventor 吴可郭俊旺袁清泉丛建波董国福先宏
Owner INST OF RADIATION MEDICINE ACAD OF MILITARY MEDICAL SCI OF THE PLA
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