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High-speed axially swept light sheet microscopy using a linear MEMS phased array for isotropic resolution.

Joseph Landry1, Stephen Hamann1, Olav Solgaard1

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Phased arrays (PAs) enable high-speed, high-resolution 3D imaging in light sheet microscopy by overcoming the speed limitations of traditional axial scanning mechanisms. This advancement significantly improves imaging speed without compromising resolution.

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axial scancylindrical lenslight sheet microscopyphased array

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Area of Science:

  • Biomedical Imaging
  • Microscopy Techniques
  • Optical Engineering

Background:

  • Axially swept light sheet microscopy offers deconvolution-free, high-resolution 3D imaging.
  • Conventional axial scanning mechanisms often limit the maximum imaging speed.

Purpose of the Study:

  • To develop a high-speed phased array (PA) system for axial scanning in light sheet microscopy.
  • To achieve both high resolution and high imaging speed simultaneously.

Main Methods:

  • Utilized a high-speed PA with an update rate exceeding camera row read time.
  • Employed the PA to track the rolling shutter effect at camera-limited rates.
  • Evaluated the point spread function to confirm sub-micron isotropic resolution.

Main Results:

  • Achieved isotropic resolution down to 720 ± 55 nm in all three spatial dimensions.
  • Demonstrated PA tracking of the camera sensor rolling shutter at camera-limited rates with a 2.85 μs update rate.
  • Clearly resolved features in a live Drosophila embryo, outperforming static light sheet imaging.

Conclusions:

  • Phased arrays are compatible with axially swept light sheet microscopy.
  • PAs offer substantial improvements in imaging speed for high-resolution 3D microscopy.
  • The random-access nature of PAs ensures even temporal sampling without speed loss.