A three-dimensional electrical impedance imaging system and imaging method of respiratory process based on pxi bus

Abstract

The invention relates to a PXI-bus-based respiration process three-dimensional electrical impedance imaging system and an imaging method thereof. According to the PXI-bus-based respiration process three-dimensional electrical impedance imaging system and the imaging method thereof, the three-dimensional electrical impedance imaging system which is in three layers and comprises 48 electrodes is constructed by means of highly integrated hardware and software tool kits of the PXI bus; a pair of adjacent exciting electrodes is selected sequentially through a gating switch; safe alternating currents are injected into a thoracic cavity, voltage signals on the other electrodes are collected synchronously; a distribution image of sensitive areas of electrical impedances inside the thoracic cavity during a respiration process is obtained on a computer through filtration, amplification, analog-digital conversion, demodulation and transmission and finally through an image reconstruction algorithm. Compared with the existing electric resistance imaging system, the PXI-bus-based respiration process three-dimensional electrical impedance imaging system has the advantages of being high in measuring accuracy, rapid in speed and high in reliability, having no damage to human bodies, achieving continuous real-time bedside monitoring and continuously monitoring respiration variations of human lungs clinically in real time.

Description

technical field [0001] The invention belongs to the medical field, and relates to medical monitoring equipment and medical functional imaging technology, in particular to a PXI bus-based three-dimensional electrical impedance imaging system and an imaging method for breathing process. Background technique [0002] Electrical Impedance Tomography (EIT) is a new generation of non-invasive medical imaging technology that has emerged in recent years following morphological and structural imaging. Medical research shows that various tissues (organs) of the human body have different impedance characteristics, and some pathological phenomena and physiological activities can cause changes in the impedance of human tissue. When a disease occurs, functional changes in related tissues and organs often precede organic lesions and other clinical symptoms. Functional changes will be very beneficial for the general survey, prevention, early diagnosis and treatment of related diseases. EI...

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Problems solved by technology

Since the existing EIT system excitation sources have defects such as nonlinear distortion and clutter that are difficult to eliminate, and the excitation frequency is mostly limited to below 1M; and the selection of multi-way switch inevitably has crosstalk, leakage, and noise, etc. Channel differences and asynchronous time-sharing data acquisition mode will also cause inaccurate data demodulation results and poor system stability. Therefore, improving the frequency and accuracy of the excitation source and acquisition module of the EIT system and improving the measurement method are the key to improving the imaging resolution of the EIT system. The essential

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