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Related Concept Videos

X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Sample Preparation and Experimental Design for In Situ Multi-Beam Transmission Electron Microscopy Irradiation Experiments
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WE-C-217BCD-02: Design of an MR Compatible Rotating Anode X-Ray Tube.

P Lillaney1, M Shin1, W Hinshaw1

  • 1Stanford University, Stanford, CA.

Medical Physics
|May 19, 2017
PubMed
Summary

A novel rotating anode X-ray tube design overcomes magnetic field interference for hybrid imaging systems. This new motor design enables faster anode rotation, improving X-ray performance in challenging environments.

Keywords:
AnodesBioelectrochemistryElectrodesElectron opticsElectrostaticsExternal fieldImage detection systemsMagnetic fieldsMagnetoresistanceTesting procedures

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Area of Science:

  • Medical Imaging Physics
  • Biomedical Engineering
  • X-ray Tube Technology

Background:

  • Standard rotating anode X-ray tubes fail in strong magnetic fields due to altered electron trajectories and motor braking.
  • Hybrid X-ray/Magnetic Resonance (MR) systems require X-ray tubes that can operate in close proximity to MR scanners.

Purpose of the Study:

  • To design a novel rotating anode X-ray tube for operation in strong magnetic field environments.
  • To enable "close proximity" hybrid X-ray/MR system geometries.

Main Methods:

  • Utilized optimized resistive coils for partial shielding of the MR fringe field.
  • Employed bias voltages on electrodes to correct electron trajectories.
  • Developed a novel motor design analogous to a three-phase brushed DC motor, using the MR fringe field as the stator.

Main Results:

  • Simulations confirmed that the combined magnetostatic/electrostatic method can correct for magnetic fields up to 152 mT.
  • A prototype motor accelerated to 3000 rpm in 10 seconds under a 60 mT external field.
  • The novel motor design demonstrated superior performance compared to existing induction motors in magnetic fields.

Conclusions:

  • The developed electron trajectory control method is validated by space charge simulations.
  • The prototype motor design shows significant improvement over existing technologies in magnetic environments.
  • This X-ray tube design facilitates the development of "close proximity" hybrid X-ray/MR systems without compromising imaging performance.