Medical Signal Processing Device Brightness Correction
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Solution Overview
Problem
It is challenging to maintain a consistent ratio of emission of white light to excitation light when synthesizing white light and fluorescence images, leading to variations in brightness of the fluorescence image compared to the white light image, even when using the same concentration of fluorescence agent in the same environment.
Innovation Solution
A medical signal processing device that acquires first and second image signals, detects signal levels of visible light and fluorescence, and calculates a correction coefficient to adjust the fluorescence signal levels, using a cap member with a chart portion that reflects white light and emits fluorescence excited by excitation light, ensuring consistent imaging conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If white light and excitation light are emitted for imaging, then both white light image and fluorescence image can be acquired, but the ratio of emission of white light to excitation light cannot be kept constant, causing brightness variation in fluorescence image
Solution Approach 1:
A cap member with a chart portion is introduced as an intermediary standard object. The chart portion has known reflectivity for white light and known fluorescence characteristics when excited. By imaging this standard object under both white light and excitation light, a correction coefficient can be calculated to compensate for variations in emission ratios, thus maintaining brightness consistency in fluorescence images.
Solution Approach 2:
The system uses the chart portion as a reference to provide feedback information about the actual emission conditions. The correction coefficient derived from imaging the chart portion feeds back into the image processing to adjust and normalize fluorescence image brightness, compensating for variations in white light to excitation light emission ratios.
2Adaptability or versatility
If different endoscopes or light sources are used, then imaging flexibility is improved, but brightness variation between fluorescence and white light images increases
Solution Approach 1:
The cap member with chart portion serves as a universal intermediary standard that can be used with different endoscopes and light sources. By imaging this standard object with each specific device combination, a device-specific correction coefficient is obtained, which compensates for the unique characteristics of each endoscope and light source pair, thereby maintaining brightness consistency across different devices.
Solution Approach 2:
The correction coefficient acts as an adjustable parameter that changes according to the specific endoscope and light source combination. By calculating and applying different correction coefficients for different device configurations, the system adapts to parameter variations in emission characteristics while maintaining consistent fluorescence image brightness.
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 solution allows for accurate control of brightness variations between fluorescence and white light images, enabling consistent observation and quantification of fluorescence, even with different endoscopes or light sources, by calculating and applying a correction coefficient based on detected signal levels.
Implementation Method 1
the chart portion reflects first light
Implementation Method 2
the second light exciting a fluorescent substance included in the object
Data Source
AI summary
A medical signal processing device includes: an acquisition unit is configured to acquire a first image signal acquired by emission of first light onto an object, and a second image signal acquired by emission of second light onto the object, the first light being in a wavelength band including visible light, and the second light exciting a fluorescent substance included in the object; a detection unit configured to detect each of a signal level of the visible light included in the first image signal and a signal level of fluorescence included in the second image signal; and a calculation unit configured to calculate a correction coefficient to correct the signal level of the fluorescence by using a result of the detection by the detection unit.