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

Praneeth Kandlakunta, Richard Pham, Rao Khan, Tiezhi Zhang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Multiple pixel x-ray sources facilitate new designs of imaging modalities that may result in faster imaging speed, improved image quality, and more compact geometry. We are developing a high-brightness multiple-pixel thermionic emission x-ray (MPTEX) source based on oxide-coated cathodes. Oxide cathodes have high emission efficiency and, thereby, produce high emission current density at low temperature when compared to traditional tungsten filaments. Indirectly heated micro-rectangular oxide cathodes were developed using carbonates, which were converted to semiconductor oxides of barium, strontium, and calcium after activation. Each cathode produces a focal spot on an elongated fixed anode. The x-ray beam ON and OFF control is performed by source-switching electronics, which supplies bias voltage to the cathode emitters. In this paper, we report the initial performance of the oxide-coated cathodes and the MPTEX source.

Original languageEnglish
Pages (from-to)N320-N336
JournalPhysics in medicine and biology
Issue number13
StatePublished - Jun 13 2017


  • computed tomography
  • multi-pixel x-ray source
  • novel CT geometry
  • tetrahedron beam CT


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