The CytoViva 3D Enhanced Darkfield Imaging System

A method for locating unlabeled nanostructures in complex matrices

The CytoViva 3D Enhanced Darkfield Imaging System provides a method for detecting unlabeled nanostructures (particles, nanotubes, etc.) in a variety of translucent matrices (cells, tissues, organisms). This technique leverages the high signal-to-noise optical performance of the patented CytoViva Enhanced Darkfield Microscope Technology, combining it with deconvolution algorithms and particle localization methods. This allows researchers to obtain a three-dimensional optical model of their sample. Furthermore, this technique does not require fluorescent labels to visualize nanoparticles, eliminating the potential negative effects of such labels on the sample.

The 3D image is created by acquiring and storing a series of equally spaced two-dimensional images along the Z-axis. These images are then processed using CytoViva 3D Image Analysis plug-ins for ImageJ to locate particles and deconvolve surrounding cells, tissues, or other translucent matrices. The resulting optical image is then displayed in an ImageJ 3D viewer, with the possibility of further data processing in a familiar environment for many users.

The CytoViva 3D Enhanced Darkfield Imaging System is designed to facilitate research in various fields, including nanobiology (targeted drug delivery and pathogen detection) and nanotoxicology (study of nanoparticles and carbon nanotubes in tissues). Additionally, this technology is fully compatible with the CytoViva Hyperspectral Imaging System and can be used on the same microscope platform, enabling easy upgrades to existing systems to incorporate this capability.

Videos

CytoViva 3D Enhanced Darkfield Imaging: Unlabeled Au Nanoparticles In a Cell
CytoViva 3D Enhanced Darkfield Imaging: Unlabeled Carbon Nanotubes Embedded in Tissue
CytoViva Reflected Darkfield Microscopy 3D Image of Fiber Matrix

Technical Features

STAGE

  • Type: Piezoelectric Z-Axis Movement
  • Travel Range: 200 µm
  • Best Repeatability: 1 nm
  • Accuracy/Linearity of Travel: 0.2%
  • Maximum Load: 500 grams
  • Stage Control Options: USB, RS232

IMAGING CCD

  • Model: Q-imaging Exi Blue
  • Pixel Size: 6.45 µm x 6.45 µm
  • Pixel Count: 1.4M
  • Exposure Time Range: 10 µs – 17.9 min
  • Resolution: 1392 x 1040
  • Frame Rate (Full Resolution): 10.9 fps @ Full Resolution @14 bits (20MHz)
  • Dynamic Range A/D: 14 bits
  • Camera Control: IEEE-1394 FireWire with 2 simultaneous ports
  • Binning: 1 x 1, 2 x 2, 4 x 4, 8 x 8

OPERATING SYSTEM

  • Computer: Dell Precision T7910 Mini-Tower
  • RAM: 64 GB
  • Graphics Card: NVIDIA Quadro K6000 12GB
  • Operating System: Windows 7

LIGHT SOURCE

  • Lamp Type: Prior Lumen 200 Watt Metal Arc Lamp
  • Wavelength: 350 nm – 700 nm
  • Power: 200 Watts

SOFTWARE

  • 3D Acquisition Software
    Custom CytoViva Acquisition Software
    Collect Z Stacks with minimum 100 nm per slice as MultiStack TIF files

  • 3D Analysis Software
    CytoViva 3D Software performs:

    • Deconvolution
    • Finds Nanoparticle Centers
    • Creates PSFs
    • Estimates True NA of the System
      Operates within ImageJ

Analysis Methods

  • Deconvolution: DAMAS2 Method
  • Nanoparticle Locator: Locates Nanoparticles in Z Axis based on Scatter Intensity
  • PSF Generation: Generates PSF files based on Acquisition Properties and Environmental Conditions
  • NA System Estimator: Finds NA of System when using Variable Iris Objectives