Lissajous Scan Cycle Crossing for Wide-Area OCT Imaging
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Solution Overview
Problem
The challenge in scanning imaging techniques, such as OCT, is to widen the angle of view while maintaining effective motion artifact correction, as increasing the path length of Lissajous scans leads to longer data acquisition times, exacerbating the impact of sample movement and complicating motion artifact correction.
Innovation Solution
A scanning imaging apparatus and method that integrates Lissajous scans with a wider angle of view by controlling a scanner and movement unit to ensure that cycles in pattern scans cross each other at specific points, allowing for interlocking scan and movement control to maintain effective motion artifact correction without prolonging cycle paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the path length of Lissajous scan is increased to widen the angle of view, then the scanning area is enlarged, but the data acquisition time becomes longer causing motion artifacts
Solution Approach 1:
The patent segments the scanning process into multiple Lissajous cycles that are interleaved with motion correction reference scans. By dividing the wide-area scan into multiple overlapping cycles with crossing points, the system can periodically reference the crossing points to detect and correct motion artifacts, thus enabling wide-area scanning without proportionally increasing total acquisition time.
Solution Approach 2:
The patent implements feedback by using the crossing points of Lissajous cycles as reference markers to detect sample motion. The system continuously monitors the positions of these crossing points across cycles, calculates motion artifacts based on position deviations, and applies corrections to maintain image quality throughout the extended scanning area.
2Area of stationary object
If the path length of Lissajous scan is increased to widen the angle of view, then the scanning area is enlarged, but motion artifact correction becomes less effective
Solution Approach 1:
The patent segments the wide scanning area into multiple Lissajous cycles with intentionally designed crossing points. These crossing points serve as distributed reference markers throughout the expanded area, enabling motion detection and correction to remain effective across the entire wide field of view rather than being limited to a small region.
Solution Approach 2:
The patent uses the crossing points of Lissajous cycles as intermediary reference markers that mediate between the expanded scanning area and the motion correction algorithm. These crossing points provide measurable reference positions that allow the system to detect and correct motion artifacts throughout the wide scanning area without requiring direct continuous monitoring of the entire area.
3Productivity
If the scanning speed is increased to reduce data acquisition time, then the angle of view can be widened faster, but the precision of motion artifact detection decreases
Solution Approach 1:
The patent performs preliminary action by pre-planning the Lissajous scan pattern with specifically designed crossing points that serve as motion reference markers. This pre-structured pattern ensures that even at high scanning speeds, the crossing points provide sufficient reference information for accurate motion artifact detection and correction, maintaining precision without sacrificing scanning speed.
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 enables wider area scanning with improved motion artifact correction, maintaining image quality by ensuring cycles cross at multiple points, thus integrating Lissajous scans with increased view angles without lengthening scan paths, effectively addressing the issue of sample movement artifacts.
Implementation Method 1
a scanner 44 to apply an optical scan to a sample to acquire data
Data Source
AI summary
In a scanning imaging apparatus of some aspect examples, a scanner applies an optical scan to a sample to acquire data. A scan controller controls the scanner to sequentially apply, to the sample, pattern scans according to a two-dimensional pattern including cycles. A movement unit relatively moves a scan area corresponding to the two-dimensional pattern and the sample. A movement controller controls the movement unit such that cycles in first and second scans of the pattern scans cross each other. An image constructing unit constructs an image based on data acquired under controls performed by the scan controller and the movement controller. The scan controller and the movement controller perform controls of the scanner and the movement unit respectively such that first and second cycles in a pattern scan cross each other at least at one point.