Even fluorescence excitation by multidirectional selective plane illumination microscopy (mSPIM)

Area of Science:

• Biomedical imaging
• Optical microscopy
• Cell biology

Background:

• Selective plane illumination microscopy (SPIM) is a powerful technique for biological imaging.
• Conventional SPIM suffers from artifacts like shadowing and light sheet spread due to absorption and scattering in specimens.
• These artifacts limit imaging depth and resolution, especially in larger biological samples.

Purpose of the Study:

• To introduce and validate a novel imaging technique, multidirectional selective plane illumination microscopy (mSPIM).
• To overcome the limitations of single-directional SPIM by reducing absorption and scattering artifacts.
• To improve axial resolution and image quality for imaging biological specimens.

Main Methods:

• mSPIM utilizes a pivoting light sheet to eliminate shadowing caused by specimen absorption.
• Illumination is performed consecutively from opposing directions to compensate for light sheet scattering.
• Resulting images from opposing directions are computationally fused to generate a superior final image.

Main Results:

• mSPIM effectively reduces absorption and scattering artifacts, providing an evenly illuminated focal plane.
• The effective light sheet thickness is reduced, leading to a square root of 2 increase in axial resolution compared to single-directional SPIM.
• Demonstrated successful imaging of live, millimeter-sized zebrafish embryos, highlighting the technique's utility in complex biological samples.

Conclusions:

• mSPIM significantly enhances image quality and resolution in light-sheet microscopy.
• The multidirectional illumination strategy is crucial for imaging optically challenging biological specimens.
• mSPIM represents a valuable advancement for high-resolution imaging of live embryos and other biological samples.