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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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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.
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Influence of Ultra-Low-Dose CT on PET Image Quantification and Visual Assessment.

Samaneh Mostafapour1, Joyce van Sluis2, Johannes H van Snick2

  • 1Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; and S.Mostafapour@umcg.nl.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|October 3, 2025
PubMed
Summary

This study introduces an ultra-low-dose CT (ULD-CT) protocol for PET/CT scans, significantly cutting radiation exposure by 97% without compromising PET image quality or diagnostic accuracy in oncology patients.

Keywords:
PET/CTSn filterattenuation correctiondiagnostic accuracyquantification

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Area of Science:

  • Medical Imaging
  • Radiology
  • Nuclear Medicine

Background:

  • High-sensitivity PET scanners reduce radiation dose, making CT dose a larger fraction of total PET/CT scan dose.
  • Optimizing CT protocols is crucial for minimizing overall patient radiation exposure during PET/CT imaging.

Purpose of the Study:

  • To evaluate the feasibility and efficacy of an ultra-low-dose CT (ULD-CT) protocol using a tin (Sn) filter.
  • To assess if ULD-CT maintains PET image quality and quantitative accuracy in oncology patients.

Main Methods:

  • FDG PET/CT scans were performed on 29 oncology patients using both LD-CT and ULD-CT protocols.
  • ULD-CT protocol utilized a Sn filter with 100 kVp and 6 mAs.
  • Quantitative (SUVs, Patlak analysis) and qualitative assessments of PET images were conducted.

Main Results:

  • CT radiation dose was reduced by 97% with the ULD-CT protocol.
  • SUV variations were less than 3%, and Patlak analysis showed negligible differences.
  • PET image quality and lesion detection remained high, with no significant degradation.

Conclusions:

  • The ULD-CT protocol significantly reduces CT radiation dose in PET/CT.
  • Diagnostic quality and quantitative accuracy of PET scans are maintained.
  • This protocol offers a promising approach for optimizing radiation dose in PET/CT imaging.