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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.
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A comparison of MR-based attenuation correction in PET versus SPECT.

H R Marshall1, R Z Stodilka, J Theberge

  • 1The Lawson Health Research Institute, Imaging Program, London, Ontario, Canada. hmarshall@lawsonimaging.ca

Physics in Medicine and Biology
|July 5, 2011
PubMed
Summary

Magnetic resonance (MR)-based attenuation correction (AC) algorithms, developed for positron emission tomography (PET)/MR, show improved performance for single photon emission computed tomography (SPECT)/MR imaging. SPECT reconstructions using MR-based AC maps demonstrated higher fidelity and less sensitivity to variations.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Biomedical Engineering

Background:

  • Attenuation correction (AC) is crucial for quantitative accuracy in positron emission tomography (PET) and single photon emission computed tomography (SPECT) imaging.
  • Magnetic resonance (MR)-based AC algorithms are established for hybrid PET/MR systems but require validation for SPECT/MR.

Purpose of the Study:

  • To evaluate the applicability of MR-based AC algorithms, validated for PET, to SPECT imaging.
  • To compare the performance of MR-based AC in PET versus SPECT reconstructions.
  • To assess the sensitivity of MR-based AC reconstructions to variations in attenuation maps for both modalities.

Main Methods:

  • Anthropomorphic chest phantom and canine studies (n=4 per group) were conducted using PET/CT and MR, and SPECT/CT and MR.
  • MR-based attenuation maps were generated and applied to reconstruct PET and SPECT images.
  • Quantitative and qualitative comparisons of image fidelity and sensitivity to attenuation map variations were performed.

Main Results:

  • SPECT reconstructions using MR-based attenuation maps exhibited higher fidelity compared to PET reconstructions.
  • SPECT reconstructions demonstrated lower sensitivity to variations in the MR-based attenuation map.
  • The findings suggest MR-based AC algorithms are robust for SPECT/MR applications.

Conclusions:

  • MR-based AC algorithms designed for PET/MR systems are expected to perform effectively, with potentially improved results, in SPECT/MR systems.
  • The study validates the use of MR-based AC for emerging SPECT/MR hybrid imaging technologies.
  • Further development and application of these algorithms can enhance quantitative accuracy in SPECT imaging.