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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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PET/CT artifacts.

Todd M Blodgett1, Ajeet S Mehta, Amar S Mehta

  • 1Department of Radiology, University of Pittsburgh, PA, USA. toddblodgett@yahoo.com

Clinical Imaging
|January 18, 2011
PubMed
Summary
This summary is machine-generated.

Artifacts in positron emission tomography/computed tomography (PET/CT) imaging can mimic malignant lesions. Recognizing these common artifacts, especially those from attenuation correction (AC), is crucial for accurate diagnosis and improved PET/CT image quality.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiology

Background:

  • Artifacts in Positron Emission Tomography/Computed Tomography (PET/CT) imaging can lead to misinterpretation.
  • Attenuation Correction (AC) artifacts, specifically those using CT, are common and can mimic true pathology.
  • Accurate identification of these artifacts is critical for clinical decision-making.

Purpose of the Study:

  • To identify and characterize common artifacts in PET/CT imaging.
  • To discuss how specific artifacts, particularly AC artifacts, can mimic 2-deoxy-2-[18F] fluoro-d-glucose (FDG) avid malignant lesions.
  • To explore protocol variables influencing PET/CT image quality.

Main Methods:

  • Review and characterization of various artifacts encountered in PET/CT scans.
  • Analysis of attenuation correction techniques and their potential for artifact generation.
  • Correlation of artifact presentation with specific imaging protocols.

Main Results:

  • Several types of artifacts were identified and characterized.
  • Attenuation correction artifacts were found to frequently mimic malignant lesions on FDG PET/CT scans.
  • Specific protocol variations were associated with altered image quality and artifact prevalence.

Conclusions:

  • Recognition of common PET/CT artifacts, especially AC-related ones, is essential to avoid misdiagnosis of malignancy.
  • Understanding artifact formation mechanisms aids in optimizing imaging protocols.
  • Improved awareness and protocol management can enhance the diagnostic accuracy of PET/CT.