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Evaluation of limited blood sampling population input approaches for kinetic quantification of [18F]fluorothymidine PET data

Authors
  • Contractor, Kaiyumars B1
  • Kenny, Laura M1
  • Coombes, Charles R1
  • Turkheimer, Federico E2
  • Aboagye, Eric O1, 3
  • Rosso, Lula2
  • 1 Hammersmith Hospital, Department of Surgery and Cancer,Imperial College Healthcare NHS Trust, London, UK , London (United Kingdom)
  • 2 Imperial College London, Department of Neuroscience, London, UK , London (United Kingdom)
  • 3 Hammersmith Hospital, Imperial College School of Medicine, Room 240, MRC Cyclotron Building, Clinical Sciences Centre, Du Cane Road, London, W12 0NN, UK , London (United Kingdom)
Type
Published Article
Journal
EJNMMI Research
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Mar 24, 2012
Volume
2
Issue
1
Identifiers
DOI: 10.1186/2191-219X-2-11
Source
Springer Nature
Keywords
License
Yellow

Abstract

BackgroundQuantification of kinetic parameters of positron emission tomography (PET) imaging agents normally requires collecting arterial blood samples which is inconvenient for patients and difficult to implement in routine clinical practice. The aim of this study was to investigate whether a population-based input function (POP-IF) reliant on only a few individual discrete samples allows accurate estimates of tumour proliferation using [18F]fluorothymidine (FLT).MethodsThirty-six historical FLT-PET data with concurrent arterial sampling were available for this study. A population average of baseline scans blood data was constructed using leave-one-out cross-validation for each scan and used in conjunction with individual blood samples. Three limited sampling protocols were investigated including, respectively, only seven (POP-IF7), five (POP-IF5) and three (POP-IF3) discrete samples of the historical dataset. Additionally, using the three-point protocol, we derived a POP-IF3M, the only input function which was not corrected for the fraction of radiolabelled metabolites present in blood. The kinetic parameter for net FLT retention at steady state, Ki, was derived using the modified Patlak plot and compared with the original full arterial set for validation.ResultsSmall percentage differences in the area under the curve between all the POP-IFs and full arterial sampling IF was found over 60 min (4.2%-5.7%), while there were, as expected, larger differences in the peak position and peak height.A high correlation between Ki values calculated using the original arterial input function and all the population-derived IFs was observed (R2 = 0.85-0.98). The population-based input showed good intra-subject reproducibility of Ki values (R2 = 0.81-0.94) and good correlation (R2 = 0.60-0.85) with Ki-67.ConclusionsInput functions generated using these simplified protocols over scan duration of 60 min estimate net PET-FLT retention with reasonable accuracy.

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