Electroimpedance Tomograph Automatic Frequency Adaptation
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Solution Overview
Problem
Existing electroimpedance tomographs (EITs) are sensitive to electromagnetic background signals, which can change over time, leading to fluctuations in the useful signal-to-background ratio, making them unsuitable for routine medical operations without manual intervention.
Innovation Solution
An EIT with a control unit that automatically records and processes voltage signals to determine the background frequency spectrum, adjusts the current feed frequency to achieve a useful signal-to-background ratio above a preset threshold, and repeats this process periodically or upon certain criteria, allowing for automatic or manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feed frequency is set manually or fixed at the beginning of measurement, then the device structure remains simple, but the useful signal-to-background ratio fluctuates over time due to changing electromagnetic background signals
Solution Approach 1:
The control unit continuously monitors the frequency spectrum of background signals and automatically adjusts the feed frequency based on the measured voltage signals from electrodes. This closed-loop feedback mechanism maintains an optimal useful signal-to-background ratio by adapting to changing electromagnetic environments without manual intervention.
Solution Approach 2:
The system performs automatic frequency adjustment without requiring human operator intervention. The control unit independently analyzes background signals and modifies feed frequency parameters to maintain optimal measurement conditions, enabling the device to self-optimize in changing environments.
2Productivity
If manual intervention is required to adjust feed frequency, then the device complexity remains low, but the productivity decreases due to time loss and operational interruptions
Solution Approach 1:
The control unit continuously monitors the frequency spectrum of background signals and automatically adjusts the feed frequency based on the measured voltage signals from electrodes. This closed-loop feedback mechanism maintains an optimal useful signal-to-background ratio by adapting to changing electromagnetic environments without manual intervention.
Solution Approach 2:
The system performs background signal analysis and frequency optimization before actual measurements are taken. By pre-adjusting the feed frequency to avoid problematic frequency ranges, the system ensures optimal measurement conditions are established in advance, preventing interruptions during data collection.
3Measurement precision
If the feed frequency is fixed without adaptation, then the device operation is simple, but the measurement precision deteriorates due to fluctuating signal-to-background ratio
Solution Approach 1:
The control unit continuously monitors the frequency spectrum of background signals and automatically adjusts the feed frequency based on the measured voltage signals from electrodes. This closed-loop feedback mechanism maintains an optimal useful signal-to-background ratio by adapting to changing electromagnetic environments without manual intervention.
Solution Approach 2:
The system dynamically changes the feed frequency parameter in response to detected background signal characteristics. By adjusting this critical parameter in real-time, the system maintains optimal measurement precision despite varying electromagnetic conditions, transforming a static parameter into a dynamic adaptive variable.
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
The EIT becomes insensitive to electromagnetic background signals, maintaining a high useful signal-to-background ratio without human operator intervention, ensuring reliable impedance distribution reconstruction in medical settings.
Implementation Method 1
Electric impedance tomography is a method for the reconstruction of impedance distributions, more precisely, of impedance changes relative to a reference distribution, in electrically conductive bodies
Implementation Method 2
the control unit is set up for the automatic setting of the current feed frequency/frequencies to record a frequency spectrum or a plurality of frequency spectra of the background by detecting the voltage signals of the electrodes
Data Source
AI summary
An electroimpedance tomograph including a plurality of electrodes placed on a body, measuring circuits processing voltage signals recorded by the electrodes, and a control unit supplying two electrodes each with an alternating current. The control unit has a preset feed frequency. The control unit processes the processed voltage signals of all other electrodes to reconstruct the impedance distribution of the body in the electrode plane. The control unit provides for an automatic setting of the current feed frequency/frequencies to record a background frequency spectrum by detecting the electrode voltage signals over a preset period of time and record them as a voltage time series and transform them into a frequency spectrum. The control unit searches in the background frequency spectrum for a frequency (different states) or frequencies (different frequencies) that leads to a useful signal to background ratio above a preset threshold value when used as a feed frequency.