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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.
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Computed Tomography01:10

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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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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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Updated: Jun 21, 2025

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Technical note: Can photon-counting CT improve PET/CT's quantitative accuracy?

James Hamill1, Noah Birge1, Jim O'Doherty2,3

  • 1Siemens Medical Solutions USA, Knoxville, Tennessee, USA.

Medical Physics
|July 9, 2024
PubMed
Summary
This summary is machine-generated.

Photon counting detector CT (PCD-CT) significantly improves the accuracy of linear attenuation coefficients (LACs) for positron emission tomography combined with computed tomography (PET/CT) imaging. This advancement enhances quantitative accuracy, particularly after iodine contrast administration.

Keywords:
PETattenuation correctionphoton‐counting CT

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Area of Science:

  • Medical Imaging Physics
  • Radiological Sciences
  • Nuclear Medicine Technology

Background:

  • Linear attenuation coefficients (LACs) in PET/CT are typically derived from energy-integrating detector CT (EID-CT), but are inaccurate with iodine contrast.
  • Photon counting detector CT (PCD-CT) offers potential for improved LAC accuracy.

Purpose of the Study:

  • To evaluate if PCD-CT can enhance the quantitative accuracy of PET/CT scans.
  • To assess the impact of PCD-CT on LAC accuracy, especially in the presence of iodine contrast.

Main Methods:

  • Two experiments were conducted: CT-only phantom studies and combined PET/CT phantom studies.
  • EID-CT and PCD-CT were used to derive LACs from phantoms simulating human tissues, including bone and iodinated blood.
  • PET images were reconstructed using LACs from both EID-CT and PCD-CT, with quantitative accuracy assessed via recovery coefficients (RC).

Main Results:

  • PCD-CT-derived LACs showed a maximum error of 3%, compared to up to 18% error for EID-CT.
  • PET quantitative accuracy improved with PCD-CT, indicated by more consistent recovery coefficients (mean RC 101.0% vs. 103.8% for EID-CT).
  • Image consistency in both body and head orientations was enhanced using PCD-CT.

Conclusions:

  • PCD-CT provides accurate LAC information for PET reconstruction within a single acquisition.
  • This technology holds promise for improving the quantitative performance of PET/CT imaging.