3D Laser Ablation Tomography for Opaque Specimens
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Solution Overview
Problem
Current imaging techniques, such as confocal microscopy and laser tomography, are limited in their ability to image specimens with varying consistency, density, and absorption coefficients, and do not provide compositional data or color, while X-ray microtomography lacks color and compositional information, restricting their applicability to specific types of materials.
Innovation Solution
A high-speed, automated, and high-resolution tomographic method using a laser sheet parallel to the imaging plane, which ablates a cross-section of the specimen while imaging it, allowing for 3D reconstruction with minimal thermal damage and suitable for a wide range of materials, including biological specimens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If confocal microscopy is used to image thin planes of focus, then background noise interference is reduced, but the method is restricted to sub-millimeter regimes and translucent or transparent matter only
Solution Approach 1:
The patent replaces the mechanical sectioning method (microtome) with a laser-based ablation method. The laser beam removes material at known rates through controlled ablation, enabling 3D imaging of opaque and heterogeneous materials without requiring them to be translucent or transparent, thus expanding material applicability while maintaining imaging precision
Solution Approach 2:
The patent changes the fundamental parameter of material interaction from optical transmission (confocal microscopy requires light to pass through the sample) to laser ablation (material removal through controlled energy input). This parameter change allows imaging of opaque, heterogeneous, and non-translucent materials that were previously inaccessible to confocal microscopy
2Manufacturing precision
If laser tomography with perpendicular beam is used, then material removal at known rates is achieved, but penetration depth varies with varying consistency, density, porosity, and absorption coefficients
Solution Approach 1:
Instead of sending the laser beam perpendicular to the surface (as in conventional laser tomography), the patent directs the laser beam parallel to the imaging plane, causing the beam to travel through the specimen thickness. This inverted approach allows the beam to interact with material layers sequentially as the stage moves, providing consistent penetration depth control regardless of material properties
Solution Approach 2:
The patent introduces dynamic control by moving the stage through the laser beam while imaging. This dynamic approach allows the system to adapt to varying material properties by controlling the relative motion between the laser beam and specimen, maintaining consistent penetration depth and ablation rates across heterogeneous materials
3Reliability
If X-ray microtomography is used, then nondestructive imaging is achieved, but compositional data and color information are not provided
Solution Approach 1:
The patent utilizes the optical properties of materials, including color and absorption characteristics, as part of the imaging process. By directing laser light through the specimen and detecting transmitted light, the system captures color information and compositional data that are lost in X-ray imaging, while maintaining non-destructive imaging through controlled low-power laser exposure
4Manufacturing precision
If microtome method is used to cut thin sections, then physical sectioning is achieved, but the process is time-consuming and requires embedding in paraffin wax substrate
Solution Approach 1:
The patent replaces the mechanical microtome sectioning process with a laser-based ablation method. Instead of physically cutting and embedding specimens in paraffin wax, the laser beam directly removes material at controlled rates, eliminating the time-consuming embedding step and significantly increasing sectioning speed while maintaining precise thickness control through software-controlled ablation depth
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 high-resolution 3D modeling of specimens with minimal thermal impact, providing compositional data and color information, and is applicable to various materials, including delicate and hard specimens, with superior edge quality and increased specimen dimensions.
Implementation Method 1
uses a laser beam to remove material at known rates
Implementation Method 2
Ablates only the desired amount of the specimen by moving a stage
Data Source
AI summary
A laser ablation tomography system includes a specimen stage for supporting a specimen. A specimen axis is defined such that a specimen disposed generally on the axis may be imaged. A laser system is operable to produce a laser sheet in a plane intersecting the specimen axis and generally perpendicular thereto. An imaging system is operable to image the area where the laser sheet intersects the specimen axis.