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Related Experiment Video

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Time-of-Flight PET/CT Imaging of Ga-68-Dotatate: Normal Pattern, SUV Quantification, and Differences from

Matthew Clifton Miller1, Avani T Bansal2, Daniel Wingard3

  • 1School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland, United States.

World Journal of Nuclear Medicine
|June 27, 2024
PubMed
Summary

Newer time-of-flight (TOF) PET/CT cameras show higher gallium-68-dotatate SUVmax values than older non-TOF systems. This study establishes a normal TOF SUVmax database for objective abnormality detection.

Keywords:
NETPET/CTTOFdotatate

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Area of Science:

  • Nuclear Medicine
  • Radiopharmacology
  • Medical Imaging Technology

Background:

  • Standardized uptake values (SUVs) for gallium-68-dotatate (Ga-68-dotatate) using non-time-of-flight (non-TOF) PET/CT are established.
  • Newer, highly sensitive TOF PET/CT cameras are replacing older systems, potentially altering SUVmax measurements.

Purpose of the Study:

  • To establish a normal Ga-68-dotatate TOF SUVmax database for common structures.
  • To aid objective visual detection of abnormalities.
  • To compare SUVmax values between TOF and non-TOF algorithms.

Main Methods:

  • Fifty patients with presumed neuroendocrine tumors underwent Ga-68-dotatate scans on a PET-CT camera capable of both TOF and non-TOF reconstruction.
  • Regions of interest (ROIs) were drawn around 24 normal structures and abnormal lesions.
  • SUVmax was measured for each ROI using both TOF and non-TOF algorithms for comparison.

Main Results:

  • Non-TOF uptake aligned with previous studies.
  • TOF images offered better visual target-to-background ratios.
  • TOF SUVmax was higher across most structures compared to non-TOF, notably more than double in adrenals and uncinate pancreas, and 1.8 times higher in abnormal lesions.

Conclusions:

  • A normal Ga-68-dotatate TOF SUVmax database is provided for objective abnormality detection.
  • TOF SUVmax measurements are generally higher than non-TOF, with abnormal lesions showing approximately 1.8 times higher values.
  • These findings are crucial for comparing patient scans across different PET/CT technologies.