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Related Experiment Videos

Experience with the EEC phantom and test procedures in two block detector scanners.

T J Spinks1

  • 1MRC Cyclotron Unit, Hammersmith Hospital, London, UK.

Medical Progress Through Technology
|January 1, 1991
PubMed
Summary

Performance of two positron emission tomography (PET) scanners was compared. The brain scanner showed higher sensitivity and efficiency, especially with septa retracted, demonstrating improved PET imaging capabilities.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Physics

Background:

  • Positron emission tomography (PET) scanners are crucial for medical diagnostics.
  • Evaluating the performance of commercial PET scanners is essential for optimizing clinical applications.

Purpose of the Study:

  • To compare the physical performance of two modern commercial PET scanners.
  • To assess transaxial resolution, sensitivity, scatter fraction, and count rate performance.

Main Methods:

  • Utilized a phantom and standardized test procedures from the EEC Concerted Action.
  • Compared a whole-body scanner (8 rings, 102 cm diameter) and a brain scanner (16 rings, 76 cm diameter).
  • Evaluated performance with and without septa retraction for the brain scanner.

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Main Results:

  • Transaxial resolution and recovery coefficients were similar due to equal detector widths.
  • Brain scanner exhibited 7% higher normalized volume sensitivity with septa.
  • Septa retraction increased brain scanner efficiency by approximately 5x.
  • Scatter fractions were lower in reconstructed images compared to sinograms.
  • Accurate dead time correction was observed up to 480 MBq.

Conclusions:

  • Both PET scanners demonstrated comparable transaxial resolution.
  • The brain scanner offers significantly higher sensitivity and efficiency, particularly with septa retracted.
  • Reconstruction algorithms effectively manage scatter, and dead time correction is reliable at high activities.