Soft-Field Tomography Artifact Suppression via Frequency Segmentation
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Solution Overview
Problem
Soft-field tomography systems, such as EIS, face challenges in accurately reconstructing conductivity distributions due to geometric and transducer placement artifacts, which lead to inherent artifacts in the reconstruction process.
Innovation Solution
The method involves using a soft-field tomography system with transducers that apply excitation patterns with multiple frequency components, measuring responses, and employing a reconstruction module to separate and suppress artifacts by distinguishing between frequency-dependent material properties and frequency-independent geometric effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional soft-field tomography reconstruction is used, then the internal properties of the object can be measured, but geometric and transducer placement artifacts degrade the accuracy of the conductivity distribution reconstruction
Solution Approach 1:
The patent segments the measured data into different frequency components, recognizing that material properties are frequency-dependent while geometric artifacts are frequency-independent. By separating the data in the frequency domain, the method can selectively process different components to eliminate artifacts while preserving genuine material property information.
Solution Approach 2:
The patent changes the parameter domain from spatial to frequency domain by applying Fourier transforms to the measured impedance data. This parameter transformation allows differentiation between frequency-dependent material properties and frequency-independent geometric artifacts, enabling selective suppression of artifacts through frequency-domain filtering operations.
2Measurement precision
If multiple frequency components are used in excitation patterns, then material properties can be distinguished from geometric effects, but the complexity of the measurement and reconstruction process increases
Solution Approach 1:
The patent replaces complex spatial-domain artifact suppression techniques with frequency-domain signal processing operations. By using Fourier transforms and frequency-domain filtering, the method substitutes mathematically elegant operations for what would otherwise require complex mechanical or geometric corrections, simplifying the overall system while maintaining high artifact suppression capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively discriminates and suppresses geometric and transducer placement artifacts, relaxing the requirement for accurate geometric modeling and improving the accuracy of property distribution reconstructions in soft-field tomography systems.
Implementation Method 1
Soft-field tomography, such as Electrical Impedance Spectroscopy (EIS) (also referred to as Electrical Impedance Tomography (EIT))
Data Source
AI summary
A system and method for artifact suppression in soft-field tomography are provided. One method includes obtaining an excitation pattern and applying the excitation pattern to an object, wherein the excitation pattern includes a plurality of frequency components. The method also includes measuring a response at one or more of a plurality of transducers coupled to the object and separating the responses among the plurality of frequency components to suppress one or more artifacts.