Excitation measuring multiplexing coil assembly for magnetic induction tomography and data collection method

Abstract

The invention discloses an excitation measuring multiplexing coil assembly for magnetic induction tomography and a data collection method. A group of coils are arranged around a measured object, the centers of the coils are in the same plane, and any one coil can be used as both an exciting coil and a measuring coil; when a coil is used as an exciting coil, the rest coils are used as measuring coils; the exciting coil is electrified with alternating current, the eddy current sensing signal is detected through the measuring coils; and then all the coils are traversed in sequence and respectively used as the exciting coils, the measurement signals are detected through the measuring coils, and the impedance distribution image of the measured object in the fractured layer of the coil centers can be reconstructed according to all the measured data through a magnetic induction tomography algorithm. According to the invention, on the premise that the coil assembly and the measured object arekept stationary during the measuring process of a traditional magnetic induction tomography system, one coil is arranged at one position, thus the number of the coils is reduced by 50%, the coupling relation among the coils is simplified, and the measurement precision and stability of the data acquisition system are improved.

Description

technical field [0001] The invention belongs to a medical imaging method in the field of biomedical engineering, and relates to a magnetic induction tomography method for obtaining electrical impedance tomography in a non-contact manner, in particular to an excitation measurement multiplexing coil group and a data acquisition method for magnetic induction tomography. Background technique [0002] Electrical impedance tomography is a medical imaging method different from traditional CT, MRI, etc. It injects current / voltage through a group of electrodes attached to the surface of a section of the measured object (such as the human body) and then measures the response voltage / current , using the imaging algorithm to reconstruct the electrical impedance distribution image inside the fault where the electrode is located. [0003] Magnetic induction tomography is a non-contact electrical impedance tomography method. It applies alternating current excitation to the coil that is not...

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Problems solved by technology

[0005] The coil system used in the existing magnetic induction tomography has 2 or 3 coils at the same position, including both the excitation coil and the measurement coil, which leads to a large number of coils in the system and a complicated coupling relationship between them , which affects the performance of the entire magnetic induction tomography data acquisition system to a certain extent

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