Electron Microscopy Navigation With Real-Time Compound Imaging
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Solution Overview
Problem
Current microscope systems face challenges in efficiently navigating large specimen areas due to poor signal-to-noise ratios in X-ray images, which hinder the identification of chemical elements and compounds, requiring users to switch between electron and X-ray images inefficiently, potentially missing regions of interest.
Innovation Solution
A method and system that acquire and display compound image frames in real-time using both high and low signal-to-noise ratio detectors, combining images to improve signal quality and allowing users to navigate specimen surfaces more efficiently by overlaying or displaying both image types simultaneously, enabling rapid identification of features and maintaining focus on regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dwell time per pixel is extended to improve signal-to-noise ratio in X-ray images, then the signal-to-noise ratio improves, but the time to complete an image frame increases
Solution Approach 1:
The system performs preliminary actions by continuously accumulating X-ray photon data in real-time during beam scanning, building up signal-to-noise ratio progressively before the frame is complete. This allows the system to prepare image data incrementally rather than waiting for the entire frame to finish scanning
Solution Approach 2:
The system uses feedback by continuously monitoring the accumulated X-ray signal and updating the displayed image frame by frame. The real-time visualization provides feedback to users about regions of interest, allowing them to make navigation decisions without waiting for the complete high-S/N image
2Loss of information
If users switch between electron and X-ray images to navigate and identify features, then they can utilize both high S/N electron images and chemical information, but the navigation process is interrupted and efficiency is reduced
Solution Approach 1:
The system merges electron image data and X-ray image data into a single composite display that shows both topographical/structural information and chemical composition information simultaneously. This integration allows users to navigate and identify features without switching between separate images
Solution Approach 2:
The displayed image frame serves multiple functions simultaneously: it provides navigation guidance like electron images, displays chemical composition information like X-ray images, and updates in real-time to reflect current beam position. This multi-functionality eliminates the need for separate viewing modes
3Measurement precision
If the field of view is reduced to increase magnification, then detail visibility improves, but the area that can be explored decreases
Solution Approach 1:
The system dynamically adjusts the field of view based on user needs and discovered regions of interest. Users can easily change magnification and field of view during navigation, and the system adapts the displayed image accordingly, allowing flexible exploration from wide-area overview to detailed examination
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 enhances navigation efficiency by providing real-time, high-quality images that combine topographical and chemical information, allowing users to quickly locate and analyze regions of interest without interrupting the navigation process, thereby improving productivity and reducing the likelihood of missing relevant features.
Implementation Method 1
When the beam strikes a specimen, some electrons are scattered back from the specimen (backscattered electrons or BSE) or interact with the specimen to produce secondary electrons (SE)
Implementation Method 2
When the beam strikes a specimen, some electrons are scattered back from the specimen (backscattered electrons or BSE)
Implementation Method 3
X-ray photons emitted from that part of the specimen will also strike an X-ray detector and with associated signal processing, individual photon energies can be measured and signals generated that correspond to the characteristic emission lines for chemical elements present under the beam
Data Source
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AI summary
A method and system for analyzing a specimen in a microscope are disclosed. The method comprises: acquiring a series of compound image frames using a first detector and a second detector, different from the first detector, wherein acquiring a compound image frame comprises: causing a charged particle beam to impinge upon a plurality of locations within a region of a specimen, the region corresponding to a configured field of view of the microscope, the microscope being configured with a set of microscope conditions, monitoring, in accordance with the configured microscope conditions, a first set of resulting particles generated within the specimen at the plurality of locations using the first detector so as to obtain a first image frame, monitoring, in accordance with the configured microscope conditions, a second set of resulting particles generated within the specimen at the plurality of locations using the second detector, so as to obtain a second image frame, wherein each image frame comprises a plurality of pixels corresponding to, and derived from the monitored particles generated at, the plurality of locations within the region, for each pixel of the second image frame, if the configured microscope conditions are the same as those for a stored second image frame of an immediately preceding acquired compound frame in the series, and if the respective pixel corresponds to a location within the region to which a stored pixel comprised by said stored second image frame corresponds, combining said stored pixel with the pixel so as to increase the signal-to-noise ratio for the pixel, and combining the first image frame and second image frame so as to produce the compound image frame, such that the compound image frame provides data derived from, for each of the plurality of pixels, the particles generated at the corresponding location within the region and monitored by each of the first detector and second detector; and displaying the series of compound image frames in real-time on a visual display.