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A Short Dynamic Scan Method of Measuring Bone Metabolic Flux Using [18F]NaF PET.

Tanuj Puri1, Musib M Siddique2, Michelle L Frost3

  • 1Department of Biomedical Engineering, School of Biomedical Engineering and Imaging Sciences, King's College London, 4th Floor Lambeth Wing, St. Thomas' Hospital, London SE1 7EH, UK.

Tomography (Ann Arbor, Mich.)
|November 29, 2021
PubMed
Summary
This summary is machine-generated.

Shortening [18F]NaF PET scan times to 12 minutes significantly reduces costs and improves patient comfort while maintaining accurate bone metabolic flux (Ki) measurements using the Hawkins model with fixed rate constants.

Keywords:
CTPET[18F] sodium fluoride[18F]NaFarterial input functionbone metabolismcomputed tomographykinetic modellingpositron emission tomographyshort dynamic scan

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Area of Science:

  • Nuclear Medicine
  • Radiochemistry
  • Bone Metabolism

Background:

  • 18F]NaF PET is used to measure bone metabolic flux (Ki).
  • Conventional analysis requires long, 60-minute dynamic scans, increasing costs and patient burden.
  • Shorter scan times are desirable for clinical feasibility.

Purpose of the Study:

  • To evaluate Ki measurements using shorter [18F]NaF PET scan times.
  • To compare shorter scan analyses with fixed Hawkins model rate constants to conventional 60-min scans.
  • To determine the minimum scan time for equivalent statistical power.

Main Methods:

  • 30 postmenopausal women (15 teriparatide-treated, 15 untreated) underwent 60-min [18F]NaF PET-CT scans of both hips at baseline and 12 weeks.
  • Scans were analyzed using the Hawkins model with a semi-population arterial input function.
  • The model was re-run with fixed rate constants for dynamic scan times from 0-12 min up to 0-60 min in 4-min increments.

Main Results:

  • Ki measurements using the Hawkins model with fixed rate constants achieved equivalent or superior statistical power compared to conventional 60-min dynamic scans.
  • Effective scan times as short as 12 minutes were sufficient for robust Ki quantification.
  • This optimization reduces scan duration without compromising measurement accuracy.

Conclusions:

  • Optimized [18F]NaF PET protocols using fixed Hawkins model rate constants can significantly shorten scan times.
  • 12-minute scans provide reliable bone metabolic flux (Ki) measurements.
  • This approach enhances the clinical utility and cost-effectiveness of [18F]NaF PET in bone metabolism studies.