Nanoscale X-ray Imaging via Thin Film Anode
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Solution Overview
Problem
Conventional microscopes, including optical and electron microscopes, face limitations in spatial resolution and depth of penetration, making it difficult to visualize biological specimens in their native state without elaborate sample preparation, and they cannot provide high-resolution, tomographic views of thick biological specimens.
Innovation Solution
An X-ray imaging apparatus using a thin film anode within a scanning electron microscope configuration, which generates a focused electron beam to produce an X-ray beam with a spot size of 1-20 nm, allowing for high-resolution imaging of biological specimens in their native state without extensive sample preparation, and enabling 3D tomographic views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional light microscopes are used, then imaging can be performed with simple operation, but spatial resolution is limited to 200-500 nm due to Rayleigh resolution limit
Solution Approach 1:
The patent replaces the optical illumination system with an electron beam system. The electron beam is focused to a nanometer-scale spot on the thin film anode, and characteristic X-rays are generated from the interaction. This substitution of the illumination mechanism enables nanometer-scale spatial resolution while maintaining a relatively simple microscope configuration.
Solution Approach 2:
The patent changes the fundamental imaging parameter from optical wavelength to electron beam energy and X-ray wavelength. By using a focused electron beam with nanometer spot size to generate characteristic X-rays, the system achieves spatial resolution an order of magnitude better than conventional light microscopes.
2Measurement precision
If scanning electron microscopes are used, then spatial resolution of 5-35 nm can be achieved, but depth of penetration is limited and tomographic view cannot be provided
Solution Approach 1:
Instead of detecting secondary electrons emitted from the sample surface as in conventional SEM, this patent generates X-rays from a thin film anode and uses them to transmit through the sample. This inversion of the detection approach enables X-ray transmission imaging and tomography while maintaining nanometer-scale spatial resolution.
Solution Approach 2:
The patent introduces a thin film anode as an intermediary between the electron beam and the sample. The electron beam interacts with the thin film anode to generate characteristic X-rays, which then transmit through the sample. This intermediary enables both high spatial resolution (from the focused electron beam) and deep penetration with tomographic capability (from the X-ray transmission).
3Measurement precision
If conventional electron microscopy is used, then high spatial resolution can be achieved, but elaborate sample preparation is required and liquid or solid biopsy specimens cannot be visualized in native state
Solution Approach 1:
The patent replaces electron beam illumination of the direct sample with X-ray illumination. Since X-rays have greater penetration depth and can transmit through thicker samples including liquid specimens, elaborate sample preparation such as sectioning, staining, or vacuum drying is not required. Biological specimens can be imaged in their native state.
4Adaptability or versatility
If X-ray imaging with conventional sources is used, then deep penetration can be achieved, but spatial resolution cannot reach nanometer scale
Solution Approach 1:
The patent performs preliminary focusing of the electron beam to a nanometer-scale spot on the thin film anode before X-ray generation. This preliminary action of focusing the electron beam determines the spatial resolution of the resulting X-ray beam, enabling nanometer-scale resolution while maintaining the penetrating power of X-rays.
Solution Approach 2:
The patent concentrates the electron beam energy into a localized nanometer-scale region on the thin film anode. This local concentration of energy generates characteristic X-rays from a correspondingly small region, providing nanometer-scale spatial resolution. The local quality of the X-ray source matches the focal spot size of the electron beam.
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
The X-ray imaging apparatus achieves spatial resolutions of 10 nm or less, allowing for non-destructive, fast imaging of biological specimens with minimal preparation, providing both absorption and phase contrast imaging, and enabling visualization of cellular structures and interactions with exogenously administered agents.
Implementation Method 1
an electron source configured to generate an electron beam along a first direction
Implementation Method 2
an X-ray source comprising a thin film anode configured to receive the electron beam at an electron beam spot on the thin film anode, and to emit an X-ray beam substantially along the first direction from a portion of the thin film anode proximate the electron beam spot
Implementation Method 3
such that the X-ray beam passes through the sample specimen
Implementation Method 4
an X-ray detector configured to receive the X-ray beam that passes through the sample specimen
Data Source
AI summary
System and method for nanoscale X-ray imaging. The imaging system comprises an electron source configured to generate an electron beam along a first direction; an X-ray source comprising a thin film anode configured to receive the electron beam at an electron beam spot on the thin film anode, and to emit an X-ray beam substantially along the first direction from a portion of the thin film anode proximate the electron beam spot, such that the X-ray beam passes through the sample specimen. The imaging apparatus further comprises an X-ray detector configured to receive the X-ray beam that passes through the sample specimen. Some embodiments are directed to an electron source that is an electron column of a scanning electron microscope (SEM) and is configured to focus the electron beam at the electron beam spot.