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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: Sep 8, 2025

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Performance evaluation of dedicated brain PET scanner with motion correction system.

Yuya Onishi1, Takashi Isobe2, Masanori Ito3

  • 1Central Research Laboratory, Hamamatsu Photonics K. K, Hamamatsu, 434-8601, Japan. yuya.onishi@hpk.co.jp.

Annals of Nuclear Medicine
|June 13, 2022
PubMed
Summary

This study integrated motion correction (MC) optical tracking into a brain PET scanner. Results show MC significantly improves image quality, restoring images to near-rest states for better brain activity observation.

Keywords:
Brain-dedicated positron emission tomographyFree movingMotion correctionPerformance evaluation

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Area of Science:

  • Medical Imaging
  • Neuroscience
  • Biophysics

Background:

  • Positron Emission Tomography (PET) is crucial for brain activity and neurology research.
  • Motion correction (MC) algorithms are vital for enhancing PET diagnostic performance.
  • Integrating optical motion tracking into brain PET scanners offers potential for improved data acquisition.

Purpose of the Study:

  • To evaluate the performance characteristics of a brain-dedicated time-of-flight PET scanner with incorporated MC optical motion tracking.
  • To assess the scanner's adherence to standards and guidelines for brain PET imaging.
  • To determine the impact of MC on spatial resolution and image quality.

Main Methods:

  • Performance evaluation including spatial resolution, scatter fraction, count rate, sensitivity, and image quality.
  • MC evaluation focused on spatial resolution and image quality under simulated motion.
  • Utilized iterative reconstruction for image analysis.

Main Results:

  • Basic performance: 2.2 mm spatial resolution (10 mm offset), 38.0 kcps peak NECR, 43.9% scatter fraction, 22.4 cps/(Bq/mL) sensitivity.
  • Image contrast recovery ranged from 43.2% (10 mm sphere) to 72.0% (37 mm sphere).
  • MC performance: 2.7 mm spatial resolution (±15 mm y-axis translation), contrast recovery 34.2% (10 mm sphere) to 66.8% (37 mm sphere).

Conclusions:

  • Reconstructed PET images with MC closely resemble images acquired at rest.
  • The developed PET scanner with MC effectively compensates for motion artifacts.
  • This technology enables more accurate observation of natural brain activity.