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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Multi-Tracer Studies of Brain Oxygen and Glucose Metabolism Using a Time-of-Flight Positron Emission Tomography-Computed Tomography Scanner
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Quantitative differences in [(18)F] NaF PET/CT: TOF versus non-TOF measurements.

Jorge D Oldan1, Timothy G Turkington2, Kingshuk Choudhury3

  • 1Department of Radiology, Division of Nuclear Medicine, Duke University Medical Center Durham, NC, USA.

American Journal of Nuclear Medicine and Molecular Imaging
|November 10, 2015
PubMed
Summary

Time-of-flight (TOF) PET/CT imaging with [18F] sodium fluoride (NaF) shows higher standardized uptake value (SUV) in bone metastases and normal bone structures compared to non-TOF. These quantitative differences in NaF PET/CT scans are modest but important for clinical trials.

Keywords:
PET/CTSodium fluoridepositron emission tomographyprostate cancerquantificationtime of flight

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Area of Science:

  • Nuclear Medicine
  • Radiopharmaceuticals
  • Medical Imaging

Background:

  • [(18)F] sodium fluoride (NaF) PET/CT is a key method for detecting bone metastases.
  • Time-of-flight (TOF) PET enhances image quality by reducing noise and improving resolution.
  • Quantitative accuracy in standardized uptake value (SUV) measurements is crucial for treatment response assessment.

Purpose of the Study:

  • To quantify and compare SUV differences between TOF and non-TOF [18F] NaF PET/CT reconstructions.
  • To evaluate the impact of TOF on SUV measurements in various tissues and pathologies.
  • To assess the clinical relevance of these quantitative differences in prostate cancer imaging.

Main Methods:

  • 47 prostate cancer patients underwent [18F] NaF PET/CT scans.
  • SUVmean and SUVmax were measured in normal soft tissues, osseous structures, degenerative changes, and metastases.
  • TOF and non-TOF reconstructions were compared using paired t-tests and linear correlations.

Main Results:

  • TOF reconstructions yielded higher SUVmean in all osseous structures (normal, degenerative, metastatic) compared to non-TOF.
  • TOF showed lower SUVmean in normal soft tissues like liver, brain, and adipose tissue.
  • Average SUVmean increased by 2.5% in metastases and 3.5% in degenerative joint disease with TOF, especially in smaller lesions.

Conclusions:

  • TOF [18F] NaF PET/CT provides higher SUV values in bone lesions and normal bone, and lower values in soft tissue background.
  • While statistically significant, the magnitude of SUV differences between TOF and non-TOF is modest.
  • Consideration of TOF vs. non-TOF reconstruction differences is essential for accurate therapy response evaluation and multi-center trial design.