Multi-foci Laser Scanning Microscope Time-Multiplexed Crosstalk Reduction
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Solution Overview
Problem
Conventional multi-foci laser scanning microscopes suffer from inaccuracies in imaging due to crosstalk near the boundaries of the scan area, limiting the field of view and accuracy.
Innovation Solution
A multi-foci laser scanning microscope utilizing time-multiplexed beams, where a laser generator produces multiple beams that are scanned across a sample, focused by an objective lens, and detected by a photodetector, with a processor processing signals to reduce crosstalk and increase the field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple scan areas are illuminated simultaneously in conventional multi-foci microscopes, then the field of view is increased, but crosstalk between neighboring scan areas causes imaging inaccuracies
Solution Approach 1:
The patent applies time-multiplexed periodic illumination where multiple scan areas are illuminated sequentially rather than simultaneously. The laser beam is rapidly switched between different scan areas in a periodic manner, creating the appearance of simultaneous illumination while actually maintaining temporal separation. This periodic action eliminates crosstalk between neighboring areas while preserving the expanded field of view capability.
Solution Approach 2:
The patent segments the illumination process by dividing it into distinct time slots for different scan areas. Instead of illuminating all scan areas at once, the system divides the illumination into separate temporal segments, with each scan area receiving dedicated illumination during its assigned time slot. This segmentation prevents signal overlap and crosstalk while maintaining comprehensive coverage of the expanded field of view.
2Area of stationary object
If the scanning area is increased to cover larger samples, then more sample area is observable, but crosstalk at boundaries reduces imaging precision
Solution Approach 1:
The system uses periodic time-multiplexed illumination to scan larger areas without boundary crosstalk. By rapidly switching the laser between different spatial locations in a periodic sequence, the system can cover extended scanning areas while ensuring that boundary regions are illuminated only during their designated time slots, preventing signal contamination from adjacent areas.
Solution Approach 2:
The patent introduces temporal separation as an intermediary mechanism between spatially adjacent scan areas. This temporal mediator prevents direct interaction or crosstalk at boundaries by ensuring that neighboring areas are never illuminated simultaneously, allowing the system to expand the scanning area while maintaining high boundary accuracy.
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
Enables a significantly wider field of view and reduced crosstalk, allowing for more accurate imaging and the ability to scan larger areas such as the brain's curvature with minimal interference from neighboring areas.
Implementation Method 1
A laser generator generates a plurality of time-multiplexed beams
Implementation Method 2
The objective focuses the plurality of beams from the beam scanner on to the sample
Implementation Method 3
The photodetector detects fluorescence signals from the sample
Implementation Method 4
the photodetector detects fluorescence signals from the sample
Data Source
AI summary
A multi-foci laser scanning microscope generates a set of time-multiplexed beams that are simultaneously scanned over multiple scan areas of the sample to be observed. A photodetector array associated with the beams detect fluorescence signals from the sample. A processor processes output signals from the photodetector array based on the time-multiplexing of the beams to provide a much wider field of view and reduced crosstalk between neighboring scan areas for more accurate imaging.