Line-Scanning Microscope With Synchronized Confocal Slot Readout
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Solution Overview
Problem
Existing line-scanning microscopes struggle with insufficient suppression of out-of-focus light, particularly in optically thick samples such as spheroids or organoids, and require methods that can improve imaging speed and sample sparingness.
Innovation Solution
A microscope design with a camera in a non-descanned detection beam path and a control unit that synchronizes the location of a slot-shaped readout region on the camera sensor with the elongate distribution of excitation light in the sample plane, using a phase plate and cylindrical optics to create specific illumination patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If line-scanning microscopy is used to achieve fast imaging and reduced sample damage, then imaging speed and sample sparingness are improved, but suppression of out-of-focus light is insufficient
Solution Approach 1:
The invention segments the detection process by introducing a movable confocal slot that divides the detection field into in-focus and out-of-focus regions. The slot is positioned at the confocal plane and moves synchronously with the scanning beam, allowing selective detection of light from the focal plane while rejecting out-of-focus light. This segmentation enables the system to maintain fast line-scanning imaging speed while achieving effective out-of-focus light suppression.
Solution Approach 2:
The invention introduces a confocal slot as an intermediary element between the sample and the camera sensor. This slot acts as a spatial filter that mediates the detection process by allowing only light from the focal plane to reach the sensor while blocking out-of-focus light. The slot is positioned at the confocal plane and moves synchronously with the scanning beam, enabling effective rejection of out-of-focus light while maintaining fast imaging speed.
2Measurement precision
If point-scanning microscopy is used to achieve diffraction-limited resolution and good out-of-focus suppression, then measurement precision is improved, but imaging speed decreases
Solution Approach 1:
The invention transitions from point-scanning (zero-dimensional detection) to line-scanning with confocal slot detection (one-dimensional detection). By introducing the confocal slot that extends in one dimension, the system achieves both the resolution and out-of-focus suppression of point-scanning microscopy while benefiting from the parallel detection capability of line-scanning, thereby improving imaging speed without sacrificing measurement precision.
3Object-affected harmful factors
If conventional line-scanning with semi-confocal mode is used, then some out-of-focus suppression is achieved, but suppression is not sufficient for optically thick samples
Solution Approach 1:
The invention replaces the semi-confocal mechanical arrangement with a confocal slot detection system. The confocal slot is positioned at the confocal plane and moves synchronously with the scanning beam, providing more effective out-of-focus light suppression compared to semi-confocal mode. This substitution enables reliable imaging of optically thick samples by achieving sufficient contrast through enhanced rejection of out-of-focus light.
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 fast, high-resolution three-dimensional microscopy with effective suppression of out-of-focus light, allowing for quick examination of thick samples with minimal sample impact and improved imaging speed.
Implementation Method 1
a cylindrical optics unit (18) for creating an elongate distribution of the excitation light (12)
Implementation Method 2
a phase plate (16) for creating an illumination pattern
Implementation Method 3
Fluorescence imaging of three-dimensional microscopic objects
Data Source
AI summary
A microscope having a light source for transmitting excitation light, an illumination beam path for guiding the excitation light into a sample region and for modifying a polarization state of the excitation light, a phase plate for creating an illumination pattern, a cylindrical optics unit for creating an elongate distribution of the excitation light, a scanning unit for scanning the elongate distribution of the excitation light through the sample region, a camera for recording images, a detection beam path with a microscope objective for guiding emission light onto the camera and a control unit for controlling the scanning unit and/or the camera and for reading out measurement data from the camera. The camera is arranged in a non-descanned part of the detection beam path and the control unit is configured to synchronize a location of a slot-shaped readout region in a sensor plane of the camera with a location of the elongate distribution of the excitation light in a plane of the sample.