Light-scanning endoscope phase correction for figure distortion
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Solution Overview
Problem
Light-scanning endoscopes experience distortion in image acquisition due to displacements of laser light irradiation positions from ideal positions, leading to figure distortion in the scanning direction.
Innovation Solution
A light-scanning endoscope system that includes a vibrating optical fiber, a controller synchronizing light emission with fiber vibrations, an adjusting unit correcting distortion based on the shape of irradiation positions, and a phase correcting unit shifting emission phase to align light spots with ideal positions, thereby improving linearity and correcting figure distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser light is scanned on an imaging subject along a spiral trajectory using a vibrating optical fiber, then image acquisition is enabled, but figure distortion occurs due to displacements of actual irradiation positions from ideal positions
Solution Approach 1:
The patent applies preliminary action by detecting the positions of laser light spots before image acquisition using a PSD, and calculating displacement amounts in advance. This allows the system to pre-determine correction amounts for figure distortion, which are then applied during actual imaging to eliminate distortion without affecting acquisition speed.
Solution Approach 2:
The patent implements feedback by using a PSD to detect actual laser spot positions, comparing them with ideal positions, and calculating displacement amounts. This feedback loop enables the system to dynamically adjust correction amounts based on detected position deviations, thereby eliminating figure distortion in the acquired images.
2Shape
If distortion correction is performed based on detected spot positions, then figure distortion is corrected, but the system complexity increases due to additional detection and calculation units
Solution Approach 1:
The patent applies universality by making the PSD serve multiple functions: it detects laser spot positions for distortion correction, and can also detect positions during actual imaging. The same detection unit and calculation unit are reused for both calibration and imaging operations, reducing the need for separate dedicated components and thereby limiting the increase in system complexity.
3Measurement precision
If the phase of light emission is synchronized with optical fiber vibrations, then scanning precision is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback for phase control by detecting the actual phase of optical fiber vibrations and adjusting the light emission phase accordingly. The phase correcting unit uses feedback from vibration detection to dynamically adjust the emission phase, ensuring synchronization without requiring overly complex predetermined control mechanisms.
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 figure distortion in the scanning direction by optimizing the emission phase and distortion correction, ensuring accurate alignment of light spots and reducing the influence of optical artifacts, resulting in improved image quality.
Implementation Method 1
a light-scanner that, by vibrating an optical fiber, scans light emitted from the optical fiber
Implementation Method 2
a phase correcting unit that corrects the phase at which the light is emitted on the basis of the distortion correction amount adjusted by the adjusting unit
Data Source
AI summary
A light-scanning endoscope is provided with: a light-scanner that causes an optical fiber to be vibrated; a controller that causes light to be emitted from the optical fiber with the same phase as the vibrations; an adjusting unit that adjusts a distortion correction amount on the basis of a shape of a row of irradiation positions of the light on an imaging subject; and a phase correcting unit that corrects the phase in which the light is emitted on the basis of the adjusted distortion correction amount.