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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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Related Experiment Video

Updated: Apr 7, 2026

High-Resolution Cardiac Positron Emission Tomography/Computed Tomography for Small Animals
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Dose Optimization in TOF-PET/MR Compared to TOF-PET/CT.

Marcelo A Queiroz1, Gaspar Delso2, Scott Wollenweber2

  • 1Department of Medical Imaging, Nuclear Medicine, University Hospital Zurich, Zurich, Switzerland.

Plos One
|July 7, 2015
PubMed
Summary

New Time-of-Flight PET/MR scanners significantly reduce required FDG activity for high-quality imaging. This advancement offers over 50% dose reduction in clinical settings, enhancing patient safety.

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Area of Science:

  • Nuclear Medicine
  • Medical Imaging Technology
  • Radiochemistry

Background:

  • Positron Emission Tomography (PET) combined with Magnetic Resonance Imaging (PET/MR) offers advanced diagnostic capabilities.
  • Optimizing radiotracer activity is crucial for balancing image quality and radiation dose.
  • Time-of-Flight (TOF) technology in PET systems improves signal-to-noise ratio and lesion detectability.

Purpose of the Study:

  • To assess the potential reduction in Fluorodeoxyglucose (FDG) activity for Time-of-Flight (TOF) PET/MR imaging.
  • To compare noise equivalent count rate (NECR) measurements between PET/CT and TOF PET/MR.
  • To evaluate initial clinical performance of TOF PET/MR with reduced FDG activity.

Main Methods:

  • Seventy-five patients underwent PET/CT and simultaneous TOF PET/MR imaging.
  • Optimal NECR (NECRP) was determined in clinical PET/CT scans.
  • Theoretical FDG activity requirements for TOF PET/MR were predicted using NECR data and phantom studies; initial patient scans used reduced activity levels.

Main Results:

  • The TOF PET/MR system theoretically requires approximately 1.3 kBq/mL, which is 35% of the activity needed for TOF PET/CT.
  • Initial patient evaluations on the TOF PET/MR demonstrated clinically feasible activity levels of 1.8 kBq/mL (44% of TOF PET/CT requirement).
  • A clinically realistic activity reduction of over 50% was observed.

Conclusions:

  • The new TOF PET/MR system enables high-quality PET imaging with significantly reduced FDG activity due to improved detector technology.
  • Theoretical dose reduction can reach up to 65%, though clinical routine may be slightly lower due to hardware constraints (coils, MR sequences).
  • Further large-scale studies are warranted to confirm these findings and optimize clinical protocols.