title: A Routine PET/CT Protocol with Streamlined Calculations for Assessing Cardiac Amyloidosis Using (18)F-Florbetapir.
abstract: BACKGROUND
  Cardiac amyloidosis is a rare condition characterized by the deposition of well-structured protein fibrils, proteoglycans, and serum proteins as amyloid. Recent work has shown that it may be possible to use (18)F-Florbetapir to image cardiac amyloidosis. Current methods for assessment include invasive biopsy techniques. This work enhances foundational work by Dorbala et al. by developing a routine imaging and analysis protocol using (18)F-Florbetapir for cardiac amyloid assessment.
  
  
  METHODS
  Eleven patients, three healthy controls and eight myloid positive patients, were imaged using (18)F-Florbetapir to assess cardiac amyloid burden. Four of the patients were also imaged using (82)Rb-Chloride to evaluate possible (18)F-Florbetapir retention because of reduced myocardial blood flow. Quantitative methods using modeling, SUVs and SUV ratios were used to define a new streamlined clinical imaging protocol that could be used routinely and provide patient stratification.
  
  
  RESULTS
  Quantitative analysis of (18)F-Florbetapir cardiac amyloid data were compiled from a 20-min listmode protocol with data histogrammed into two static images at 0-5, 10-15, or 15-20 min. Data analysis indicated the use of SUVs or ratios of SUVs calculated from regions draw in the septal wall were adequate in identification of all healthy controls from amyloid positive patients in this small cohort. Additionally, we found that it may be possible to use this method to differentiate patients suffering from AL vs. TTR amyloid.
  
  
  CONCLUSIONS
  This work builds on the seminal work by Dorbala et al. by describing a short (18)F-Florbetapir imaging protocol that is suitable for routine clinical use and uses a simple method for quantitative analysis of cardiac amyloid disease.
authors.affiliation: Molecular Imaging and Translational Research Program, Department of Radiology, Graduate School of Medicine, University of Tennessee , Knoxville, TN , USA.
authors.forename: Dustin R
authors.initials: DR
authors.lastname: Osborne
authors.affiliation: Molecular Imaging and Translational Research Program, Department of Radiology, Graduate School of Medicine, University of Tennessee , Knoxville, TN , USA.
authors.forename: Shelley N
authors.initials: SN
authors.lastname: Acuff
authors.affiliation: Molecular Imaging and Translational Research Program, Department of Radiology, Graduate School of Medicine, University of Tennessee , Knoxville, TN , USA.
authors.forename: Alan
authors.initials: A
authors.lastname: Stuckey
authors.affiliation: Amyloid and Cancer Theranostics Program, Department of Medicine, Graduate School of Medicine, University of Tennessee , Knoxville, TN , USA.
authors.forename: Jonathan S
authors.initials: JS
authors.lastname: Wall
keywords: Florbetapir; PET/CT; amyloid; amyloidosis; cardiac