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Related Concept Videos

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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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Author Spotlight: Standardizing Mouse In Vivo PET Imaging with Body Conforming Molds and Automated Analysis
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Performance evaluation of the PennPET explorer with expanded axial coverage.

Bing Dai1, Margaret E Daube-Witherspoon1, Stephen McDonald1

  • 1Department of Radiology, University of Pennsylvania, Philadelphia, United States of America.

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|March 23, 2023
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Summary

The updated PennPET Explorer total-body PET scanner shows 1.8x higher sensitivity and improved noise equivalent count rate (NECR) without axial gaps. This enhanced total-body PET system offers significant performance gains for advanced molecular imaging.

Keywords:
NEMA performanceaxial detector gapstotal-body PET

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Positron Emission Tomography (PET)

Background:

  • Total-body (TB) PET scanners offer extended axial fields of view (AFOV) for improved sensitivity and data acquisition.
  • Previous designs incorporated axial gaps between detector rings, impacting performance.
  • The PennPET Explorer was updated to a 6-ring configuration with an extended 142 cm AFOV, eliminating inter-ring gaps.

Purpose of the Study:

  • To evaluate the performance of the updated PennPET Explorer total-body PET scanner.
  • To quantify improvements in sensitivity, count rate, spatial resolution, and image quality compared to systems with gaps.
  • To assess the scanner's suitability for quantitative imaging with different radiotracers.

Main Methods:

  • National Electrical Manufacturers Association (NEMA) NU 2-2018 standards were adapted for measurements.
  • Modified protocols included longer phantoms for sensitivity and count-rate assessments.
  • Evaluations used NEMA image quality and clinical trials network (CTN) phantoms with 18F and 89Zr.

Main Results:

  • Total sensitivity increased by 1.8x to 140 kcps/MBq for a 70 cm line without gaps.
  • Noise equivalent count rate (NECR) improved by 1.8x, with a peak NECR of 1550 kcps at 25 kBq/cc for a 140 cm phantom.
  • Axial spatial resolution showed minimal degradation (0.6 mm) centrally, and consistent contrast recovery was observed across the AFOV.

Conclusions:

  • The updated PennPET Explorer demonstrates substantial performance enhancements over conventional PET scanners and systems with gaps.
  • The results highlight the need to update NEMA standards for evaluating total-body PET systems.
  • The gapless design offers a cost-effective approach to TB-PET with improved quantitative accuracy and imaging capabilities.