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Magnetic induction tomography(MIT) is a noninvasive and contactless medical imaging technique. The 16 channels of MIT system is showed in the paper, which image for the low conductivity object with working at 1MHz. In the study, we use the water tanker filled with salt solution and the different conductivity agar blocks to simulate the human brain with edema or hematoma. The each sensor is composed...
Electrical impedance tomography (EIT) is believed to be a distinctive imaging technology and have good prospect in the field of biomedical testing. A multi-channel electrical impedance measurement system using DSP is studied. It includes four modules: excitation source, electrode array, signal acquisition, and signal processing. The results in experiment demonstrate that the system can distinguish...
Magnetic induction tomography is a new functional imaging technology. The eddy current analysis is the basic problem of the magnetic induction tomography forward problem. The eddy current distribution in a 2-D circle region was calculated in this paper. The expression of eddy current is composed of magnetic vector potential and scalar potential functions. The magnetic vector potential was calculated...
This paper presents a design of a phase-sensitive detector based on matched filter principles and implemented using digital signal processing (DSP) technology for electrical impedance tomography (EIT) system. The digital phase-sensitive detector (DPSD) was realized with DSP, field programmable gate array (FPGA) chips and other analog circuits. The sampling pulse controlling the analog-to-digital converter...
A 4-layers sphere model of human head was used to simulate human head. From outside to inside, the layers denoted scalp, skull, CFS and cerebra, respectively. The point current source placed on the outmost layer was regarded as the boundary condition, and the method of separation of variables was used to solve the electrical potential distributions in all layers. The electrical potential and the current...
An magnetic induction tomography (MIT) hardware system is introduced in this paper. The system is composed of nine parts: signal source, sensor coils, preamplifier, canceling circuit, difference circuit, lock-in amplifier and the controller. One-dimensional measurement has been made, the relation between the phase variety and the conductivity of sample was constructed. A rectangular water-tank was...
Magnetic field measurement component is a significant part of Magnetic Induction Tomography (MIT) system. A new method using magnetic sensor as the magnetic field measurement component is introduced in this paper. First, the basic theory of magnetic sensor is introduced, and then the signal acquiring circuit, Set/Reset circuit and filter circuit are discussed. It is an ideal choice to measure small...
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