Device and method for measuring crossed plane electrical impedance tomography

Abstract

The invention discloses a device and a method capable of preferably reconstructing three-dimensional electrical impedance distribution in an object and improving electric field space distribution nonuniformity through obtaining object surface voltage information in particular relating to human organ tissues such as heads and breasts. Through the adoption of the scheme, voltage information can be obtained from both a horizontal section and a vertical section and images on the sections are respectively combined to form a space three-dimensional graphic; and voltages between the rest positions can be also obtained through exciting any contact point on the surface and then a plurality of combined measuring methods are achieved to realize multi-algorithm extension and improve image accuracy. The design mainly comprises 65 special electrodes distributed on a hemispherical surface; with a high-performance FPAG (Field Programmable Gate Array) as core, functions such as exciting source control, digital frequency synthesis, multiplex control, high speed phase-sensitive detection, fast Fourier transformation and measuring signal demodulation are integrated in a single chip; and a circuit design capable of self-adaptively adjusting output impedance of a detected object is achieved.

Description

Technical field [0001] The invention relates to a contact and measurement device in electrical impedance measurement, in particular to an electrical impedance imaging measurement device and method for human organs and tissues. Background technique [0002] Electrical impedance imaging is a method that only needs to measure on the surface of an object and reconstruct the internal impedance distribution. It builds an electric field by injecting current into a target area, and then measures the voltage generated around the target. In traditional electrical impedance tomography technology, the placement of electrodes is usually limited to a certain plane. However, electrical impedance imaging is essentially a three-dimensional problem, and its current is not limited to flowing on a certain plane. Therefore, two-dimensional image reconstruction is usually Will produce artifacts. The main problem of three-dimensional electrical impedance imaging is that the system cannot afford compl...

AI Technical Summary

Problems solved by technology

In traditional electrical impedance tomography, the placement of electrodes is usually limited to a certain plane. However, electrical impedance imaging is essentially a three-dimensional problem, and its current is not limited to flow on a certain plane. Therefore, two-dimensional image reconstruction is usually will produce artifacts

The main problem of 3D electrical impedance imaging is that the system cannot afford complex algorithms, and the pathological nature makes the algorithm sometimes difficult to implement, especially in the edge area, which eventually makes it difficult to judge the target position or shape distortion in the reconstructed image

The open electrical impedance imaging system can well realize the determination of the surface impedance of the object, but due to the factors of the detection depth, the accuracy can only be guaranteed within the range of 2~3 cm

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