Capsule Position Detection Interference Correction
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Solution Overview
Problem
Existing position detection systems for capsule medical devices, such as capsule endoscopes, face challenges in accurately determining the position and posture within a subject due to interference from metallic materials that generate magnetic fields, leading to errors in measurement values.
Innovation Solution
A position detection system that includes a capsule medical device generating a position-detecting magnetic field and external detection coils, with a processor that corrects magnetic field components using a correction factor calculated by comparing measurement values with and without an interference magnetic field generation material present, allowing for accurate position and posture calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field detection is performed using detection coils to determine capsule position, then position detection capability is achieved, but measurement accuracy deteriorates due to interference from magnetic field generation materials
Solution Approach 1:
The system performs preliminary measurement by detecting the magnetic field distribution when no capsule is present, then uses this pre-acquired data to calculate and remove interference components from subsequent measurements when the capsule is present, thereby improving position detection accuracy
Solution Approach 2:
The interference magnetic field component is extracted and separated from the total detected magnetic field signal through calculation, allowing the system to isolate and eliminate the harmful interference portion while retaining the useful capsule position information
2Measurement precision
If correction for interference magnetic fields is implemented, then position detection accuracy is improved, but system complexity increases due to additional correction procedures
Solution Approach 1:
The system replaces complex physical shielding or filtering mechanisms with computational methods, using software-based algorithms to calculate and subtract interference components from the detected magnetic field signals, thereby achieving correction without adding complex hardware
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 system effectively corrects for interference magnetic fields, enabling precise detection of the capsule medical device's position and posture, improving accuracy and reliability in position detection operations.
Implementation Method 1
a capsule medical device configured to generate a position-detecting magnetic field
Implementation Method 2
a plurality of detection coils arranged outside the subject, each detection coil being configured to detect the position-detecting magnetic field to output detection signal
Implementation Method 3
the first magnetic field generation material being configured to generate a magnetic field due to action of the position-detecting magnetic field
Data Source
AI summary
A position detection system includes: a capsule medical device configured to generate a position-detecting magnetic field; a plurality of detection coils arranged outside a subject; and a processor including hardware. The processor is configured to correct a magnetic field component caused by a first magnetic field generation material with respect to each of measurement values of detection signals output from the detection coils, the first magnetic field generation material being arranged inside a space that the position-detecting magnetic field generated by the capsule medical device present inside a detection target region is reachable, the detection target region being a region in which a position of the capsule medical device is detectable, the first magnetic field generation material being configured to generate a magnetic field due to action of the position-detecting magnetic field.