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Related Concept Videos

Positron Emission Tomography01:29

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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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Development of a Prototype AWSM-PET Device for Augmented Whole-Body PET Imaging and Initial Human Study.

Yunlai Chen1, Robert A Mintzer2, Sanghee Cho2

  • 1Imaging Science Program, Washington University in St. Louis, St. Louis, Missouri.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|December 4, 2025
PubMed
Summary

Augmented whole-body scanning via magnifying PET (AWSM-PET) enhances clinical PET/CT scanners. This technology improves image resolution and sensitivity for whole-body imaging, particularly for small lesions.

Keywords:
AWSM-PETaugmented whole-body PET imagingprototypevirtual-pinhole PET

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiological Technology

Background:

  • Clinical Positron Emission Tomography/Computed Tomography (PET/CT) scanners offer whole-body imaging capabilities.
  • Enhancing image resolution and sensitivity in PET/CT is crucial for early disease detection and characterization.
  • Existing technologies may have limitations in resolving small lesions or quantifying radiotracer uptake accurately.

Purpose of the Study:

  • To design and evaluate the Augmented Whole-Body Scanning via Magnifying PET (AWSM-PET) system.
  • To assess the impact of AWSM-PET on image resolution, sensitivity, and contrast recovery compared to a standard clinical PET/CT scanner.
  • To investigate the feasibility and performance of AWSM-PET in phantom and initial human imaging studies.

Main Methods:

  • Integration of two high-resolution detector panels (outserts) with a Biograph Vision PET/CT scanner.
  • Development of custom firmware and software for enhanced coincidence detection and list-mode image reconstruction.
  • Performance evaluation using sensitivity measurements, mini-resolution phantoms, NEMA IQ phantoms with small lesion inserts, and initial human imaging.

Main Results:

  • Outsert detectors achieved good energy resolution (11% at 511 keV) and fast coincidence resolving times.
  • Sensitivity increased by up to 18.4%, with improved resolution and contrast recovery for small phantom lesions (≥4.88 mm).
  • Initial human imaging showed improved resolution in high-count areas but increased noise in low-count regions.

Conclusions:

  • The prototype AWSM-PET system successfully enhances the resolution and sensitivity of clinical PET/CT scanners.
  • AWSM-PET demonstrates improved contrast recovery and spatial resolution for small lesions in phantom and human studies.
  • Further optimization is needed to address noise in low-count regions for broader clinical application.