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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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 being...
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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET

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Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules
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Impact of Point-Spread Function Modeling on Image Quality in 68Ga-PSMA PET/CT.

Subhash Chand Kheruka1, Naema Al-Maymani2, Noura Al-Makhmari2

  • 1Department of Radiology and Nuclear Medicine, Sultan Qaboos Comprehensive Cancer Care, and Research Centre, University Medical City, Muscat, Oman; and skheruka@gmail.com.

Journal of Nuclear Medicine Technology
|June 9, 2026
PubMed
Summary

Time of flight with point-spread function (TOF + PSF) modeling in 68Ga-PSMA PET/CT significantly enhances image quality and quantitative metrics like SUVmean and contrast-to-noise ratio compared to standard time of flight (TOF) reconstruction for prostate cancer imaging.

Keywords:
68Ga-PSMAPET/CTSUVpoint-spread functionprostate cancertime of flight

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Area of Science:

  • Nuclear Medicine
  • Radiology
  • Medical Imaging

Background:

  • Prostate cancer management relies on accurate imaging with 68Ga-PSMA PET/CT.
  • Image reconstruction methods impact quantitative accuracy and lesion conspicuity.
  • Evaluating advanced reconstruction techniques like TOF + PSF is crucial for optimizing 68Ga-PSMA PET/CT.

Purpose of the Study:

  • To assess the influence of Time of Flight (TOF) and TOF with Point-Spread Function (PSF) modeling (TOF + PSF) reconstruction on image quality and quantitative metrics in 68Ga-PSMA PET/CT for prostate cancer.
  • To compare quantitative parameters including SUVmean, PSMA tumor volume (PSMA-TV), total lesion uptake (TLU), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and lesion-to-background ratio (LBR) between the two reconstruction methods.

Main Methods:

  • Retrospective analysis of 36 prostate cancer patients undergoing 68Ga-PSMA PET/CT.
  • PET data reconstructed using standard TOF and advanced TOF + PSF methods on a Biograph Vision 600 system.
  • Statistical comparison of quantitative metrics using paired t-tests or Wilcoxon signed-rank tests and Bland-Altman analysis for agreement.

Main Results:

  • TOF + PSF reconstruction significantly increased SUVmean, SNR, CNR, LBR, and TLU compared to TOF (P < 0.001 for all).
  • No significant difference was observed in prostate-specific membrane antigen tumor volume (PSMA-TV) between the reconstruction methods (P = 0.626).
  • Bland-Altman analysis revealed a systematic positive bias for TOF + PSF in several metrics, suggesting reconstruction-dependent changes in relative contrast.

Conclusions:

  • TOF + PSF reconstruction demonstrably improves image quality and enhances SUV-based and contrast-related metrics in 68Ga-PSMA PET/CT for prostate cancer.
  • The improved metrics may lead to better detection of small or low-contrast lesions.
  • Phantom-based validation is recommended to confirm if these reconstruction-dependent differences translate to improved absolute quantitative accuracy.