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Magnetically resonant and electric impedance tomographic imaging method

A technology of electrical impedance tomography and magnetic resonance imaging, which is applied in the field of medical imaging and can solve problems such as difficulty in implementation

Inactive Publication Date: 2007-06-27
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

The present invention can overcome the shortcomings of rotating the imaging target in three directions in the electrical impedance tomography image reconstruction problem, and can solve the magnetic resonance imaging system in which the main magnetic field direction is perpendicular to the long axis direction of the imaging object in the current magnetic resonance impedance imaging method that does not need to rotate the imaging object Problems that are difficult to realize, so as to break through the limitations of current MREIT technology and expand the scope of application of MREIT technology

Method used

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  • Magnetically resonant and electric impedance tomographic imaging method
  • Magnetically resonant and electric impedance tomographic imaging method
  • Magnetically resonant and electric impedance tomographic imaging method

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Embodiment Construction

[0054] Fig. 3 is a specific embodiment of the present invention. Three injection current electrodes 1 are pasted on the edge of the section to be imaged by the imaging body, the main magnet, gradient coil, radio frequency transmitting coil 2 and receiving coil 3 are placed in a copper mesh shielded room, and the magnetic resonance imaging electrical system 4 (including the spectrometer system , RF power amplifier, gradient power amplifier) ​​and imaging computer 6 are placed outside the shielding room, and the power supply channel and signal channel are introduced into the shielding room by special filters on the wall of the shielding room. The measurement and control unit 5 for controlling current injection and electrode voltage measurement uses a PCI bus-based data acquisition card (PCI card for short) to realize corresponding functions.

[0055] As shown in Figure 4, the PCI data acquisition card is directly inserted into the main control computer 6 of the MRI system to rea...

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Abstract

The magnetically resonant and electric impedance tomographic imaging method features the oblique position current injecting mode. Through injecting current to the imaging target section unparallel to the normal direction and the main magnetic field direction, obtaining the component of the injected current excited magnetic field in the main magnetic field direction by means of magnetic resonant imaging process, and further calculation, the sectional impedance distribution image is obtained. The present invention is superior to available similar method with target image rotation and has no need of rotating the target image.

Description

technical field [0001] The invention relates to a medical imaging method, in particular to an electrical impedance imaging method utilizing magnetic resonance imaging technology. Background technique [0002] Different biological tissues have different electrical characteristics, and the electrical characteristics of biological tissues will change with physiological activities, even when the shape and size of body organs change, the measured impedance value will change. For example, the impedance value is different during the expansion and contraction of the stomach during eating and emptying. Biological tissues can also cause changes in impedance values ​​in pathological states. For example, when epilepsy occurs, the electrical resistance of the brain will increase by 20%. Electrical impedance tomography (Electrical Impedance Tomography, EIT) is based on these characteristics, by injecting a small safe current into the human body and measuring the potential of the body sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055
Inventor 王慧贤宋涛王玉宇何永波
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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