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Exploring the Capabilities of Computed Tomography with Bent Laue Crystal Optics

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dc.contributor.advisorChapman, Dean
dc.contributor.committeeMemberWu, Fangxiang
dc.contributor.committeeMemberZhang, Chris
dc.contributor.committeeMemberZhu, Ning
dc.contributor.committeeMemberZhong, Zhong
dc.contributor.committeeMemberMachtaler, Stephen
dc.creatorRhoades, Glendon
dc.creator.orcid0009-0007-9760-3228
dc.date.accessioned2024-07-08T21:32:38Z
dc.date.available2024-07-08T21:32:38Z
dc.date.copyright2024
dc.date.created2024-04
dc.date.issued2024-07-08
dc.date.submittedApril 2024
dc.date.updated2024-07-08T21:32:38Z
dc.description.abstractThis research aims to explore novel uses of bent Laue crystals as x-ray optics to extend the capabilities of computed tomography (CT) at synchrotron facilities. Firstly, we demonstrate the ability to manipulate a beam’s size, maintaining a parallel beam, by “compressing” it horizontally using a pair of cylindrically bent Laue crystals. This compressed beam creates a desirable aspect ratio for CT of small samples. In contrast to collimation of the beam, this compressor “funnels” a large section of the beam’s flux into a smaller imaging area, significantly raising intensity and allowing users to work in the gap between bend magnet (BM) and insertion device (ID) beamline intensities. Secondly, we demonstrate a fan-beam version of the compressor using a single crystal, greatly reducing setup time and complication. This fan-beam version provides a virtually unlimited variation in compression of the beam by adjusting sample location. We have demonstrated its capacity for CT of multiple small samples. Reconstruction is by fan-beam methods commonly used in clinical CT. Thirdly, we have leveraged the spectral nature of the compressed beam to gather additional information about the sample, based on the change in attenuation relative to x-ray energy. We demonstrate the application of k-edge subtraction to CT scans using the compressed beam, as well as the ability to capture the attenuation curves of material samples for material identification. Finally, we demonstrate a CT imaging method that images a single slice of a sample while simultaneously capturing the energy attenuation curve of every pixel at every energy in the beam. The energy range of the data easily reaches 40 keV. Furthermore, we apply material decomposition algorithms to this energy attenuation curve to provide the concentration of each of the materials in each pixel of the reconstructed CT slice. While further development of these systems is needed, we demonstrate here the proof-of-principle of these optical systems. These systems will increase the capabilities of CT at synchrotron facilities by allowing more flexibility in the intensity of BM beamlines and allowing for the extraction of attenuation curves, simultaneous to imaging, through use of spectral beams.
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10388/15793
dc.language.isoen
dc.subjectimaging
dc.subjectcomputed tomography
dc.subjecthyperspectral
dc.subjectspectral
dc.subjectx-ray
dc.subjectlaue
dc.subjectcrystal
dc.subjectfocusing
dc.subjectsynchrotron
dc.subjectbend magnet
dc.subjectcanadian light source
dc.subjectcompressor
dc.subjectoptics
dc.subjectcollimation
dc.subjectinsertion device
dc.subjectbeamline
dc.subjectenergy
dc.subject
dc.titleExploring the Capabilities of Computed Tomography with Bent Laue Crystal Optics
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentBiomedical Engineering
thesis.degree.disciplineBiomedical Engineering
thesis.degree.grantorUniversity of Saskatchewan
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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