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Related Concept Videos

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Published on: March 12, 2019

Imaging nanoparticle flow using magneto-motive optical Doppler tomography.

Jeehyun Kim1, Junghwan Oh, Thomas E Milner

  • 1Beckman Laser Institute and Medical Clinic, University of California, 1002 Health Sciences Road East, Irvine, CA 92612, USA.

Nanotechnology
|July 29, 2009
PubMed
Summary

We developed magneto-motive optical Doppler tomography (MM-ODT) to image superparamagnetic iron oxide nanoparticles. This novel method effectively visualizes SPIO nanoparticles in microfluidic flows with high contrast.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Optical Imaging

Background:

  • Superparamagnetic iron oxide (SPIO) nanoparticles are crucial for various biomedical applications.
  • Accurate imaging of SPIO nanoparticles in microfluidic systems is essential for research and diagnostics.
  • Existing imaging techniques may have limitations in sensitivity or specificity for nanoparticle detection.

Purpose of the Study:

  • To introduce and validate a novel imaging technique, magneto-motive optical Doppler tomography (MM-ODT), for SPIO nanoparticles.
  • To demonstrate the capability of MM-ODT to detect and image SPIO nanoparticles in microfluidic channels.
  • To assess the performance of MM-ODT in terms of contrast and independence from flow conditions.

Main Methods:

  • Developed a MM-ODT system combining optical Doppler tomography with an oscillating magnetic field.
  • Utilized a solenoid with a cone-shaped ferrite core to generate high magnetic field strength (up to 1 T) and focus the field.
  • Imaged SPIO nanoparticle solutions flowing through a microfluidic channel.

Main Results:

  • Successfully detected SPIO nanoparticles in a microfluidic channel using MM-ODT.
  • Observed a clear Doppler frequency shift signal corresponding to the presence of SPIO nanoparticles.
  • Demonstrated that the nanoparticle contrast was independent of flow rate and direction.
  • Achieved high contrast imaging of SPIO nanoparticles.

Conclusions:

  • MM-ODT is a promising novel approach for imaging SPIO nanoparticles.
  • The technique provides high contrast and is robust against variations in nanoparticle flow.
  • MM-ODT has potential applications in microfluidic-based diagnostics and research involving SPIO nanoparticles.