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Related Experiment Video

Updated: Mar 8, 2026

Low-energy Cathodoluminescence for OxyNitride Phosphors

Low-energy Cathodoluminescence for OxyNitride Phosphors

Published on: November 15, 2016

Development of multi-pixel x-ray source using oxide-coated cathodes.

Praneeth Kandlakunta¹, Richard Pham¹, Rao Khan¹

¹Department of Radiation Oncology, Washington University in St. Louis School of Medicine, St. Louis, MO, United States of America.

Physics in Medicine and Biology

|February 2, 2017

Summary

This summary is machine-generated.

We developed a high-brightness multiple-pixel thermionic emission x-ray (MPTEX) source using efficient oxide cathodes. This new x-ray source technology promises faster imaging and improved quality for advanced medical imaging.

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Last Updated: Mar 8, 2026

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Preparing a Celadonite Electron Source and Estimating Its Brightness

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Published on: November 5, 2019

Area of Science:

Medical Imaging
Materials Science
Physics

Background:

Multiple pixel x-ray sources offer advancements in imaging speed, quality, and compactness.
Traditional tungsten filaments have limitations in emission efficiency and operating temperature.

Purpose of the Study:

To develop and evaluate a high-brightness multiple-pixel thermionic emission x-ray (MPTEX) source.
To investigate the performance of novel oxide-coated cathodes for x-ray generation.

Main Methods:

Developed indirectly heated micro-rectangular oxide cathodes using carbonates (barium, strontium, calcium).
Utilized semiconductor oxides activated from carbonates for high emission efficiency.
Implemented source-switching electronics for x-ray beam control via bias voltage.

Main Results:

Oxide cathodes demonstrate high emission efficiency and current density at lower temperatures compared to tungsten.
Initial performance of the oxide-coated cathodes and the MPTEX source was evaluated.
Each cathode generates a focal spot on an elongated fixed anode.

Conclusions:

Oxide-coated cathodes are a promising technology for high-brightness thermionic emission x-ray sources.
The MPTEX source design has the potential to enhance imaging modalities.
Further characterization of the MPTEX source is warranted.