Transmission Charged Particle Microscopy Imaging via Spatiotemporal Data Sorting
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Solution Overview
Problem
Transmission Charged Particle Microscopes face challenges in acquiring images due to radiation damage, drift, distortion, and aberrations, which are exacerbated by low irradiating beam currents that reduce the Signal-to-Noise Ratio and introduce errors through quantization processes.
Innovation Solution
A method involving particle counting mode data acquisition and outputting spatiotemporal data in raw form, followed by mathematical corrections to assemble images, allowing for accurate identification and mitigation of anomalies such as drift and aberrations, and enabling effective data compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low irradiating beam currents are used to reduce radiation damage, then radiation damage is reduced, but the Signal-to-Noise Ratio deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the image acquisition into multiple frames captured at low beam current, then processing these segmented frames through sorting and counting operations to reconstruct the final image with improved signal-to-noise ratio while maintaining low total dose
Solution Approach 2:
The patent performs preliminary actions by capturing multiple frames at low beam current before final image reconstruction, allowing the system to accumulate sufficient signal through subsequent processing operations while avoiding the harmful effects of high beam current
2Object-affected harmful factors
If low irradiating beam currents are used, then radiation damage is reduced, but quantization errors increase
Solution Approach 1:
The patent segments the low-current signal into multiple frames and applies sorting operations to group similar signals together, reducing quantization errors through statistical accumulation while maintaining low radiation dose
Solution Approach 2:
The patent implements feedback through iterative sorting and counting operations that refine the image reconstruction, using information from multiple frames to correct quantization errors and improve overall image quality
3Measurement precision
If multiple frames are captured and processed to improve Signal-to-Noise Ratio, then Signal-to-Noise Ratio is improved, but data storage requirements increase
Solution Approach 1:
The patent extracts only the essential information from multiple frames through sorting and counting operations, discarding redundant data while preserving the signal needed for high-quality image reconstruction, thereby reducing storage requirements
Solution Approach 2:
The patent discards redundant information from multiple frames through processing operations that extract only the necessary signal components, recovering the essential image data in a compressed form that requires less storage space
4Measurement precision
If drift and aberrations are corrected through processing, then imaging precision is improved, but processing complexity increases
Solution Approach 1:
The patent segments the correction process into distinct sorting and counting operations that address drift and aberrations separately, making the complex correction task more manageable and computationally efficient
Solution Approach 2:
The patent performs preliminary sorting operations on the captured frames before final image reconstruction, pre-correcting for drift and aberrations in a way that simplifies subsequent processing steps
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 preserves data integrity, facilitates accurate correction of imaging anomalies, and achieves significant data compression, improving the Signal-to-Noise Ratio and reducing storage and processing requirements.
Implementation Method 1
Using an illumination system to direct a beam of charged particles from a source onto said specimen
Implementation Method 2
Using an imaging system to direct charged particles that are transmitted through the specimen onto a detector
Data Source
AI summary
A method of using a Transmission Charged Particle Microscope, comprising:Providing a specimen on a specimen holder;Using an illumination system to direct a beam of charged particles from a source onto said specimen;Using an imaging system to direct charged particles that are transmitted through the specimen onto a detector,further comprising the following actions:In an acquisition step, lasting a time interval T, using said detector in particle counting mode to register spatiotemporal data relating to individual particle detection incidences, and to output said spatiotemporal data in raw form, without assembly into an image frame;In a subsequent rendering step, assembling a final image from said spatiotemporal data, while performing a mathematical correction operation.