使用光学显微镜和共聚焦显微镜成像生物样品

Optical microscopes illuminate the entire sample thickness, causing out-of-focus blur from light interference outside the focal plane. Confocal microscopes use a pinhole to filter out-of-focus light, illuminating only a narrow depth at one time. This produces higher resolution images with better contrast and eliminates blur, though only a small portion of the sample is imaged at once.

Optical microscopes typically achieve resolution down to 200 nanometers in ideal conditions but are limited by diffraction of visible light waves, which have wavelengths around 500 nanometers. This physical limitation prevents optical microscopes from achieving the resolution of electron microscopes, yet they remain valuable tools for imaging biological macrostructures in research and clinical settings.

A raster scan moves the sample systematically in the X-Y plane while adjusting the Z height to access different focal planes. This point-by-point approach ensures maximal resolution at each location, building a complete high-resolution image of the sample surface. The technique allows confocal microscopes to capture detailed topographical information that would be impossible with single-plane imaging.

Start by loading the sample and centering it beneath the lens. Begin at low magnification, adjust focus using the Z manipulator, then capture an overview image. Set reference points, gradually increase magnification to desired resolution, define the measuring range by setting top and bottom focal points, verify no light oversaturation occurs, and finally acquire the tomography image for 3D analysis.

After acquiring and optimizing an image using lighting and contrast adjustments, use the pencil tool to access measurement features. The distance and area tools measure cell sizes and cross-sectional dimensions. Software calculates internal areas of sections and generates reports. Save the job for further analysis through the results workflow tab, enabling detailed quantitative assessment of biological structures.

Scanning laser ophthalmoscopy, a confocal technique, diagnoses and monitors retinal diseases by producing high-contrast stereoscopic images of microglia, the resident macrophages of the retina. Confocal microscopy also enables live cell imaging, allowing researchers to visualize cell migration, proliferation, and protein dynamics in real time using fluorescent dyes and timelapse imaging to study receptor internalization.

Depth of focus determines how much of the sample remains in sharp focus at once. Confocal microscopes provide deep focus with varying depth levels, enabling detailed analysis of sample topography and 3D structure. Digital optical microscopes image entire slides but at lower resolution. Choosing the right technique depends on whether you need high resolution of thin sections or comprehensive imaging of thicker samples.