Imaging the Brain In Situ with Phase Contrast CT

Linda Croton, Kaye Morgan, David Paganin, Lauren T. Kerr, Megan Wallace, Kelly Crossley, Gary Ruben, Suzanne Miller, Naoto Yagi, Kentaro Uesugi, Stuart Brian Hooper, Marcus Kitchen

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

Phase contrast X-ray imaging (PCXI) is an emerging modality that exploits the differing refractive indices of materials to create additional image contrast. When used in conjunction with computed tomography (CT), PCXI can produce images with greatly increased contrast resolution with respect to standard attenuation CT. This means that soft tissue boundaries that are typically not well resolved, such as those between the grey and white matter in the brain, can be visualized clearly. The brain poses unique problems for PCXI-CT, since it is fully encased in the highly-attenuating skull. Damage or defects in the imaging system and other physical effects result in inaccurate estimates of the attenuation gradient across high-contrast boundaries, causing distinct streak artifacts that can overwhelm the parts of the image that contain underlying tissues. In addition, ring artifacts caused by variations in X-ray beam intensity and detector response are more difficult to remove due to the roughly circular symmetry of the skull. Many common ring removal methods exploit the circular symmetry seen in ring artifacts and cannot distinguish between the skull and these artifacts.
Original languageEnglish
Title of host publicationMicroscopy and Microanalysis
Place of PublicationUnited Kingdom
PublisherCambridge University Press
Pages352-353
Number of pages2
Volume24
EditionS2
DOIs
Publication statusPublished - 10 Aug 2018

Keywords

  • Brain imaging
  • Neuroimaging
  • Phase contrast
  • Phase contrast x-ray imaging

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