Slit Detector Imaging for High-Contrast Light-Sheet Sample Examination
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Solution Overview
Problem
Existing SPIM technologies produce images with lower contrast due to the use of thicker light sheets than necessary, leading to inefficient illumination and excitation of out-of-focus regions, and require mechanical components for slit apertures, which can cause wear and limit image quality.
Innovation Solution
A method using a thinner illumination beam focused tightly on the area of interest, combined with a slit detector that moves within the detection plane to selectively detect only the focal area, avoiding mechanical components and ensuring uniform illumination across the image field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a thicker light sheet is used for illumination, then the illumination area is larger and more robust, but the image contrast decreases due to excitation of out-of-focus regions
Solution Approach 1:
The patent applies local quality by making the light sheet thickness position-dependent: thin in the focal plane where high contrast is needed, and gradually thicker in out-of-focus regions. This is achieved through controlled beam divergence from a tightly focused illumination beam, creating a thickness gradient that maintains high contrast at the plane of interest while providing sufficient illumination area.
2Measurement precision
If a thinner light sheet is used to improve image contrast, then out-of-focus excitation is reduced, but the illumination area becomes smaller and less robust
Solution Approach 1:
The patent employs dynamics by making the light sheet thickness variable along the propagation direction rather than uniform. The thickness dynamically changes from thin at the focal plane to progressively thicker in out-of-focus regions, allowing the system to adapt the illumination characteristics to the depth position and maintain both contrast and coverage.
3Measurement precision
If mechanical slit aperture components are used to define detection area, then detection precision is improved, but mechanical wear occurs and reliability decreases
Solution Approach 1:
The patent replaces the mechanical slit aperture system with an optical field definition approach. The detection area is defined by the intersection of the light sheet with the focal plane rather than by physical mechanical components. This substitution eliminates mechanical wear while maintaining precise detection area definition through optical geometry.
4Measurement precision
If a tightly focused illumination beam is used, then the light sheet becomes thinner and image contrast improves, but the depth of field decreases
Solution Approach 1:
The patent applies segmentation by dividing the illumination volume into distinct regions: a thin focal plane region where the beam is tightly focused for high contrast, and extended out-of-focus regions where the beam naturally diverges to become thicker. This segmentation allows different depth regions to have different effective thicknesses, maintaining contrast at the focal plane while providing extended illumination coverage.
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 produces higher-contrast images by illuminating only the focal area and detecting only the relevant light, reducing mechanical wear and enabling uniform image quality across the field without mechanical apertures, allowing for faster and more precise examination of sample areas.
Implementation Method 1
A method using a thinner illumination beam focused tightly on the area of interest
Implementation Method 2
the illumination strip is imaged into a detection plane by focusing detection light emanating from the illumination strip into the detection plane
Data Source
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AI summary
The invention relates to a method for examining a sample, in which method the sample is illuminated in an illumination plane along an illumination strip by means of an illuminating light beam which widens along the illumination strip, and in which the illumination strip is projected into a detection plane by detection light originating from the illumination strip being focused in the detection plane, and in which the detection light is detected by a detector. The method is characterized in that the detector is a slit detector, and the direction of the slit width of the slit detector is oriented at an angle different from zero degrees with respect to the direction of the longitudinal extent of the image of the illumination strip in the detection plane. The invention further relates to a device for carrying out this type of method.