Resonant Mirror Beam-Scanning Microscopy for kHz Frame Rates
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Solution Overview
Problem
Current high frame-rate imaging techniques face limitations such as photobleaching, phototoxicity, and challenges in multi-channel detection, particularly in camera-based platforms, which are not compatible with nonlinear imaging methods and struggle to achieve kHz frame rates with beam-scanning microscopes.
Innovation Solution
A system utilizing two synchronized fast-scanning resonant mirrors to create a Lissajous trajectory for beam scanning, combined with model-based image reconstruction and discrete cosine transform interpolation techniques, enabling kHz frame-rate optical imaging on multiple channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If camera-based platforms are used for high frame-rate imaging, then imaging speed is improved, but photobleaching and phototoxicity increase due to high signal-to-noise ratio requirements
Solution Approach 1:
The patent segments the imaging process by using a beam-scanning approach that divides the field of view into multiple pixels scanned sequentially by a resonant mirror, rather than capturing the entire field simultaneously with a camera. This allows for lower overall light intensity while maintaining high frame rates through rapid sequential scanning.
Solution Approach 2:
The patent employs periodic scanning motion using a resonant mirror that oscillates at its resonant frequency to scan the beam across the sample. This periodic action enables high frame-rate imaging by rapidly repeating the scan cycle, achieving kHz frame rates while using lower light intensities per pixel.
2Adaptability or versatility
If camera-based platforms are used for multi-channel detection, then detection capability is improved, but device complexity and cost increase due to requiring multiple high-speed cameras
Solution Approach 1:
The patent makes a single detector universal by using a beam-scanning approach where one detector sequentially samples multiple spatial locations and multiple fluorescence channels through the same focal volume. The resonant mirror scans the beam to visit different pixels and channels in sequence, allowing a single detector to perform the work of multiple simultaneous cameras.
Solution Approach 2:
The patent merges multiple detection functions into a single detector by combining spatial scanning with spectral channel detection. The beam-scanning system visits different spatial locations and different fluorescence emission wavelengths using the same detector, consolidating what would require multiple cameras into one detection device.
3Speed
If beam-scanning is used to achieve high frame rates, then imaging speed is improved, but achieving kHz frame rates remains challenging due to the large number of pixels to scan
Solution Approach 1:
The patent exploits mechanical resonance by using a resonant mirror that vibrates at its natural resonant frequency to scan the beam. This resonance enables extremely rapid scanning speeds (kHz frame rates) because the mirror naturally oscillates at high frequencies without requiring complex high-speed actuators, achieving fast scanning through resonant mechanical vibration.
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 allows for high-resolution, high-frame-rate imaging with reduced photobleaching and phototoxicity, enabling efficient multi-channel detection and overcoming the limitations of traditional camera-based systems by achieving frame rates exceeding 1000 frames per second.
Implementation Method 1
two synchronized fast-scanning resonant mirrors of differing resonant frequencies to scan the beam in a Lissajous trajectory
Implementation Method 2
When detecting sample fluorescence, the high turn-over rates required to produce such S/N can potentially result in significant photobleaching and/or phototoxicity
Data Source
AI summary
A beam-scanning optical design is described for achieving up to kHz frame-rate optical imaging on multiple simultaneous data acquisition channels. In one embodiment, two fast-scan resonant mirrors direct the optical beam on a circuitous trajectory through the field of view, with the trajectory repeat-time given by the least common multiplier of the mirror periods. Dicing the raw time-domain data into sub-trajectories combined with model-based image reconstruction (MBIR) 3D in-painting algorithms allows for effective frame-rates much higher than the repeat time of the Lissajous trajectory. Because sub-trajectory and full-trajectory imaging are different methods of analyzing the same data, both high-frame rate images with relatively low resolution and low frame rate images with high resolution are simultaneously acquired.