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Title:A tri-modality x-ray fluorescence, x-ray luminescence, x-ray transmission computed tomography imaging platform for monitoring and stimulating metal-containing nanoparticles
Author(s):George, Jonathan
Director of Research:Meng, Ling-Jian
Doctoral Committee Chair(s):Meng, Ling-Jian
Doctoral Committee Member(s):Abbaszadeh, Shiva; Smith, Andrew; Stubbins, James F.
Department / Program:Nuclear, Plasma, & Rad Engr
Discipline:Nuclear, Plasma, Radiolgc Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Abstract:X-ray-activated photodynamic therapy (X-PDT) techniques have gained traction for its potential to impart therapeutic effects at greater depths than possible with traditional photodynamic therapy [1], [2]. Interestingly, the underlying X-PDT process could also generate X-ray fluorescence (XF) with metal-based nanoparticles (NPs) and X-ray luminescence (XL), which could be used to monitor the delivery of PDT agents and the subsequent therapeutic process. This allows the possibility of using X-ray fluorescence (XFCT) and X-ray luminescence computed tomography (XLCT) to monitor the therapeutic delivery during radiation therapy. X-ray Raleigh scattering (XRS) produced by the scattered monochromatic incident X-ray can also be correlated with the data from XFCT/XLCT while X-ray transmission CT (XT CT) could provide structural information. This work demonstrates a proof-of-concept of a XF-XL -XT CT imaging platform that allows for quantitative imaging of the X-ray PDT delivery process through complementary contrast mechanisms, and demonstrates this platform’s ability to image X-PDT nanophosphors, such as Y2O3:Eu3+. This work also attempts to address the limitations of the system—sensitivity, acquisition time, and dosage—by examining how incoming X-ray irradiation schemes affect the X-ray fluorescent and X-ray luminescent yields as well as overall X-ray fluorescent image quality. Results show that choosing an optimized incident X-ray spectrum can maximize fluorescent and luminescent yields as well as improve image quality. This in conjunction with improvements in geometric efficiency through a multi-slit ring of detectors has the potential to bring the multi-modality system into a preclinical setting.
Issue Date:2017-12-21
Rights Information:Copyright 2017 Jonathan George
Date Available in IDEALS:2018-09-04
Date Deposited:2018-05

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