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Characterization of a Small Animal SPECT Platform for Use in Preclinical Translational Research

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Characterization of a Small Animal SPECT Platform for Use in Preclinical Translational Research University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 12-2011 Characterization of a Small Animal SPECT Platform for use in Preclinical Translational Research Dustin Ryan Osborne [email protected] Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Health and Medical Physics Commons, and the Medical Specialties Commons Recommended Citation Osborne, Dustin Ryan, "Characterization of a Small Animal SPECT Platform for use in Preclinical Translational Research. " PhD diss., University of Tennessee, 2011. https://trace.tennessee.edu/utk_graddiss/1211 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Dustin Ryan Osborne entitled "Characterization of a Small Animal SPECT Platform for use in Preclinical Translational Research." I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in Nuclear Engineering. Laurence Miller, Major Professor We have read this dissertation and recommend its acceptance: Lawrence Townsend, Jonathan Wall, Jens Gregor Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) Characterization of a Small Animal SPECT Platform for use in Preclinical Translational Research A Dissertation Presented for the Doctor of Philosophy Degree The University of Tennessee, Knoxville Dustin Ryan Osborne December 2011 Copyright © 2011 by Dustin Osborne All rights reserved. ii | P a g e Acknowledgements Thanks to all of my family for their love and support throughout my entire academic career. I especially want to thank my beautiful wife, Beth, for her love and support during the most hectic times between work, school and raising our most perfect daughter, Peyton. Without you in my life to continuously drive me to be a better man, husband and father, I would not have had the will or desire to complete this work. "Your mind is your only judge of truth–and if others dissent from your verdict, reality is the court of final appeal." -Ayn Rand, Atlas Shrugged , Part 3, Ch. 7 "Love is the expression of one's values, the greatest reward you can earn for the moral qualities you have achieved in your character and person, the emotional price paid by one for the joy he receives from the virtues of another." -Ayn Rand, Atlas Shrugged , Part 3, Ch. 7 iii | P a g e Abstract Imaging Iodine-125 requires an increased focus on developing an understanding of how fundamental processes used by imaging systems work to provide quantitative output for the imaging system. Isotopes like I-125 pose specific imaging problems that are a result of low energy emissions as well as how closely spaced those emissions are in the spectrum. This work seeks to characterize the performance of a small animal SPECT- CT imaging system with respect to imaging I-125 for use in a preclinical translational research environment and to understand how the performance of this system relates to critical applications such as attenuation and scatter correction. The specific aims of this work examined several key areas of system function and performance with respect to I- 125 imaging. The first aim examined the geometric SPECT calibration routine used for the Inveon imaging system with a particular focus on determining the accuracy of the calibration as well as the robustness of the algorithm under routine and adverse imaging conditions. The second aim was to characterize detector uniformity issues that may arise by comparing the uniformity performance of the system with both I-125 and Co-57 as well as examining the possibility of altering the acquisition method for normalization scans to increase the uniformity performance. The third aim sought to optimize the energy window used for acquisition of I-125 data and to determine the effects the selection of the window had on valid and scatter events. The fourth aim used the optimized windows, determined by the third aim, to assess the performance of a reconstruction algorithm, currently under development, that corrects for attenuation and scatter effects. The fifth and final aim of this work sought to assess the feasibility iv | P a g e acquiring SPECT-CT data simultaneously and to assess the quality of data that could be achieved if simultaneous acquisition of the two imaging modalities was, in fact, possible. This work met these aims by performing an extensive series of studies examining the response of the system to I-125 imaging. These included multiple series of phantom imaging using both manufacturer as well as custom-designed sources for use with measurements involving I-125 and Co-57. Statistics from over 60 datasets with analysis in greater than 480 regions of interest were used for the analysis of attenuation and scatter correction data alone. The final study involving simultaneous SPECT-CT acquisition required modification of the imaging hardware to enable this type of data collection as well as development of a reconstruction algorithm to correctly handle the CT data acquired in a step-and-shoot helical mode. A number of key findings resulted from this work including the validation of the calibration routine of this imaging system, even under non-ideal imaging conditions for both the SPECT and CT modalities. Uniformity performance with I-125 was found to be a challenge with this imaging system but reductions in performance compared to other isotopes were not significant enough to introduce severe artifacts into the image data. Optimization of I-125 parameters resulted in improvements of the processed data indicating that the recommended settings provided by the manufacturer could be altered to provide results that better balance between minimizing scatter effects and maximizing detection of valid events. Assessment of the proposed scatter and attenuation correction algorithm for this system showed marked improvement as compared to data processed without these corrections. The final study of simultaneous SPECT-CT imaging proved this acquisition method to be feasible on a commercial system with minimal v | P a g e The primary conclusions drawn from this study indicate that the system is adequate for imaging with I-125 when care is taken to properly maintain the system as well as keeping sources current and properly centered in the scanner field of view during calibration. The study strongly illustrates the necessity of compensating any data collected using I-125 for attenuation and scatter effects; with some regions showing greater than 25% attenuation and approximately 30% improvement in quantitative values for scatter affected regions with the corrections applied. The study also concludes that simultaneous SPECT-CT is feasible with minor adjustments to a commercial platform. vi | P a g e Table of Contents Chapter 1: Introduction & Overview .................................................................................. 1 Introduction ................................................................................................................. 2 Study Overview .......................................................................................................... 2 The Problem ................................................................................................................ 2 Significance and Objectives ........................................................................................ 4 Chapter 2: Literature Review .............................................................................................. 6 Preclinical Translational Imaging ................................................................................... 7 Single Photon Emission Computed Tomography (SPECT) ......................................... 11 I. Background ............................................................................................................ 11 II. Technology Overview .......................................................................................... 18 III. Attenuation & Scatter ......................................................................................... 24 Computed Tomography ................................................................................................ 29 I. Background ............................................................................................................ 29 II. Technology Overview .......................................................................................... 31 III. Hounsfield Units ................................................................................................. 45 Chapter 3: Methodology & Results .................................................................................. 49 Chapter Introduction ..................................................................................................... 50 SPECT Calibration........................................................................................................ 51 Introduction ..............................................................................................................
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