Lab-based x-ray tomography of a cochlear implant using energy discriminating detectors for metal artefact reduction

Viona S.K. Yokhana, Benedicta D. Arhatari, Timur E. Gureyev, Brian Abbey

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

X-ray computed tomography (XCT) is an important clinical diagnostic tool which is also used in a range of biological imaging applications in research. The increasing prevalence of metallic implants in medical and dental radiography and tomography has driven the demand for new approaches to solving the issue of metal artefacts in XCT. Metal artefacts occur when a highly absorbing material is imaged which is in boundary contact with one or more weakly absorbing components, such as soft-tissue. The resulting 'streaking' in the reconstructed images creates significant challenges for X-ray analysis due to the non-linear dependence on the absorption properties of the sample. In this paper we introduce a new approach to removing metal artefacts which exploits the capabilities of the recently available, photon-counting PiXirad detector. Our approach works for standard lab-based polychromatic X-ray tubes and does not rely on any postprocessing of the data. The method is demonstrated using both simulated data from a test phantom and experimental data collected from a cochlear implant. The results show that by combining the individual images, which are simultaneously generated for each different energy threshold, artefact -free segmentation of the implant from the surrounding biological tissue is achieved.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Subtitle of host publicationNanophotonics Australasia 2017; Melbourne; Australia; 10 December 2017 through 13 December 2017
EditorsJames W M Chon, Baohua Jia
Place of PublicationBellingham WA USA
PublisherSPIE
Number of pages9
Volume10456
ISBN (Electronic)9781510613942
ISBN (Print)9781510613935
DOIs
Publication statusPublished - 2 Jan 2018
Externally publishedYes
EventNanophotonics Australasia, 2017 - RMIT Univ., Buildings 14 and 80, Melbourne, Australia
Duration: 10 Dec 201713 Dec 2017
https://spie.org/conferences-and-exhibitions/nanophotonics-australasia?SSO=1

Publication series

NameProceedings of SPIE
PublisherSPIE
Volume10456
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNanophotonics Australasia, 2017
CountryAustralia
CityMelbourne
Period10/12/1713/12/17
OtherAttend SPIE NanoPhotonics Australasia 2017, a multidisciplinary forum with a focus on research that has enabled promising new nanophotonic technologies and applications across many fields, including photonics, energy, security, information, and medicine.
Internet address

Keywords

  • medical imaging
  • metal artifact reduction
  • photon counting detectors
  • X-ray tomographic imaging

Cite this

Yokhana, V. S. K., Arhatari, B. D., Gureyev, T. E., & Abbey, B. (2018). Lab-based x-ray tomography of a cochlear implant using energy discriminating detectors for metal artefact reduction. In J. W. M. Chon, & B. Jia (Eds.), Proceedings of SPIE - The International Society for Optical Engineering: Nanophotonics Australasia 2017; Melbourne; Australia; 10 December 2017 through 13 December 2017 (Vol. 10456). [104565S] (Proceedings of SPIE; Vol. 10456). SPIE. https://doi.org/10.1117/12.2283320