Electromagnetic compatible mechanical vibrator in magnetic resonance scanner
A technology of electromagnetic compatibility and mechanical vibration, applied in the direction of analysis using nuclear magnetic resonance, etc., to achieve the effect of small size, improved practicability and convenience
Inactive Publication Date: 2005-03-02
SHANGHAI JIAO TONG UNIV
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[0004] The object of the present invention is to aim at the above-mentioned deficiencies and defects existing in the prior art, to provide an electromagnetic compatibility mechanical vibration device in a magnetic resonance scanner, so that it can solve the problem of electromagnetic compatibility with the main magnetic field of the magnetic resonance scanner
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[0013] Such as figure 1 , figure 2 , image 3 ,with Figure 4 As shown, the present invention includes: a hollow cylinder 1 , a gland hollow cylinder 2 , a piezoelectric ceramic buzzer piece 3 , and a copper wire 4 . The midpoint of the end face of the piezoelectric ceramic buzzer 3 and the 1mm copper wire are soldered together, and are located between the hollow cylinder 1 and the gland hollow cylinder 2, and the hollow cylinder 1 and the gland hollow cylinder Tighten and fix with three brass screws between 2.
[0014] The hollow cylinder 1 is used to fix the piezoelectric ceramic buzzer 3, the hollow cylinder 1 is made of plexiglass, the inner diameter is 1mm smaller than the outer diameter of the piezoelectric ceramic buzzer 3, and the outer diameter is smaller than the piezoelectric ceramic buzzer 3 The outer diameter of 3 is 10 mm larger, and a sunken end face is formed on the end face of the hollow cylinder 1. The depth is the thickness of the copper sheet of the pi...
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Abstract
The invention relates to a electromagnetic compatible mechanic vibrator, applied in vibrating device field. The invention includes a hollow cylinder, a capped hollow cylinder, a piezoelectric ceramic buzzing sheet, the copper wire. The centre of the copper end of the piezoelectric ceramic buzzing sheet is welded to the copper wire with tin, and set between the hollow cylinder and the capped hollow cylinder. The hollow cylinder and capped hollow cylinder is tightly fixed to each other with a copper screw. In the invention, the mechanical vibration of the ceramic buzzing sheet is caused by piezoelectrical effect, independent of the change of the magnetic field, therefore, resolves the electromagnetic compatible problem in the magnetic resonant cavity. Because of its small capacity the piezoelectric ceramic buzzing sheet allows the vibrator to be made into a variety of needed shapes, greatly enhancing the practicality and convenience of the vibrator.
Description
technical field [0001] The invention relates to an electromagnetic compatibility vibration device, in particular to an electromagnetic compatibility mechanical vibration device in a magnetic resonance scanner. Used in the field of mechanical vibration equipment. Background technique [0002] Magnetic resonance elastography is used to measure the elastic coefficient distribution inside the target object. It first uses a vibrating device to excite the surface of the target object to excite a shear wave propagating inside the object, and then uses magnetic resonance imaging to analyze the shear wave. Imaging, and finally inverting the obtained wave image to obtain the elastic coefficient distribution inside the object. The vibration device is the necessary hardware equipment for magnetic resonance elastography imaging technology. It should be able to meet the vibration requirements of 50-1000Hz frequency, and since the vibration device should be placed in the magnet cavity of ...
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IPC IPC(8): G01N24/08
Inventor 陈俊宋朝昀钱德初庄天戈
Owner SHANGHAI JIAO TONG UNIV