Comparison of six quantitative methods for the measurement of bone turnover at the hip and lumbar spine using 18F-fluoride PET-CT

T. Puri, G.M. Blake, M.L. Frost, M. Siddique, A.E.B. Moore, P.K. Marsden, G.J.R. Cook, I. Fogelman, K.M. Curran

Research output: Contribution to journalArticlepeer-review


The aim of this study was to evaluate the relationship between different quantification methods used for the measurement of bone plasma clearance (Ki) using 18F-PET at the hip and lumbar spine.

Twelve healthy postmenopausal women aged 52–71 years were recruited. Each participant underwent 60-min dynamic 18F-PET scans at the lumbar spine and hip on two separate occasions with an injected activity of 90 and 180 MBq, respectively. Image-derived input functions were obtained at the aorta from the lumbar spine scans. Ki was evaluated using a three-compartment four-parameter model (Ki-4k), three-compartment three-parameter model (Ki-3k), Patlak analysis (Ki-Pat), spectral analysis (Ki-Spec) and deconvolution (Ki-Decon). Standardized uptake values (SUVs) were also measured.

The Pearson correlation between Ki-4k and Ki-3k, Ki-Pat, Ki-Spec, Ki-Decon and SUV were 0.91, 0.97, 0.94, 0.95 and 0.93, respectively, with a significance of P less than 0.0001. The differences between the correlations measured using Fisher’s Z-test were not significant (P>0.05). Bland–Altman analysis showed that the limits of agreement for Ki measured as the SD of the differences were 0.0082 (25.9%), 0.0062 (11.7%), 0.0098 (20.1%) and 0.0056 (25.5%) ml/min/ml, respectively, and the biases were −0.0081 (−23.8%), −0.0075 (−23.7%), −0.0107 (−29.5%) and −0.0015 (0.8%) ml/min/ml, respectively.

All five methods of quantification (Ki-3k, Ki-Pat, Ki-Spec, Ki-Decon and SUV) strongly correlated with Ki-4k. Although systematic differences of up to 29% were found between Ki-4k and the other methods (Ki-3k, Ki-Pat, Ki-Spec and Ki-Decon), these should not affect the conclusions of clinical studies, provided the methods are applied consistently. However, care should be taken when comparing reports that use different methods of quantification.
Original languageEnglish
Pages (from-to)597-606
Number of pages10
JournalNuclear Medicine Communications
Issue number6
Publication statusPublished - 1 Jun 2012


  • bone metabolism
  • comparison
  • fluorine-18
  • positron emission tomography
  • quantification methods

Research Beacons, Institutes and Platforms

  • Manchester Cancer Research Centre


Dive into the research topics of 'Comparison of six quantitative methods for the measurement of bone turnover at the hip and lumbar spine using 18F-fluoride PET-CT'. Together they form a unique fingerprint.

Cite this