3D Image Reconstruction Using Grid Mark Positioning
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Solution Overview
Problem
Existing methods for reconstructing three-dimensional images of specimens using ion beams are limited by their suitability for either soft or hard specimens and large or small sizes, and lack precision in cutting at constant intervals, making it difficult to obtain accurate cross-sections for large specimens.
Innovation Solution
A method involving a sectional specimen preparation device with a shielding member and a grid-like mark member, where the grid-like mark member is positioned at a 45-degree or 90-degree angle to the shielding member's edge, allowing for precise determination of cutting positions using the grid-like mark member as an index, enabling consistent and accurate cross-section preparation across large specimens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a shielding plate is used to cover part of the specimen and cut the exposed portion with an ion beam, then the device becomes suitable for both soft and hard specimens as well as large specimens, but the cutting position cannot be precisely controlled at constant narrow intervals
Solution Approach 1:
A grid-like mark member is introduced as an intermediary between the shielding member and the specimen. This grid member provides reference marks that serve as mediators for precisely determining cutting positions, enabling constant narrow intervals while maintaining versatility for different specimen types and sizes
Solution Approach 2:
The patent replaces intuitive manual positioning with an optical/measurement-based system using a grid-like mark member. Instead of relying on the observer's intuition to determine shielding plate position, the grid provides visual reference marks that can be precisely aligned and measured, substituting mechanical estimation with optical precision
2Productivity
If the position of the end of the shielding plate is shifted manually to obtain cross sections at constant intervals, then three-dimensional image reconstruction is possible, but the cutting intervals cannot be maintained at constant narrow intervals due to reliance on observer intuition
Solution Approach 1:
The grid-like mark member acts as an intermediary reference system that enables precise measurement and control of cutting intervals. The grid marks serve as intermediate reference points that guide the shielding plate positioning, allowing constant narrow intervals to be maintained throughout the cross-sectioning process
Solution Approach 2:
The grid-like mark member provides visual feedback for positioning the shielding plate. By observing the alignment between grid marks and the shielding plate edge, the operator receives continuous feedback to maintain constant cutting intervals, transforming intuitive estimation into a controlled process with visual verification
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 method allows for the accurate reconstruction of three-dimensional images of large specimens by ensuring consistent cutting intervals and precise positioning, overcoming the limitations of previous techniques by enabling the preparation of cross-sections at constant narrow intervals, thus improving the accuracy of the three-dimensional image reconstruction.
Implementation Method 1
a cross section preparation step of preparing a cross section of the specimen by using a sectional specimen preparation device which is provided with a shielding member disposed so as to cover a part of the specimen, and which prepares a cross section at a processing position on the specimen with an ion beam
Implementation Method 2
observing the cross section by a scanning electron microscope (hereinafter, referred to as an SEM)
Data Source
AI summary
A three-dimensional image reconstruction method, in which a cross section preparation step includes: a specimen preparation step of attaching, on a surface of a specimen, a grid-like mark member in which rectangular openings are two-dimensionally arranged, and disposing the grid-like mark member under a shielding member so that a side of each of the rectangular openings of the grid-like mark member forms a 45-degree or 90-degree angle with respect to a direction in which a linear end edge of the shielding member extends; and a processing position determination step of adjusting relative positions of the shielding member and the grid-like mark member by using the grid-like mark member as an index of a processing position.