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Morphology supporting function: attenuation correction for SPECT/CT, PET/CT, and PET/MR imaging.

Tzu C Lee1, Adam M Alessio, Robert M Miyaoka

  • 1Department of Bioengineering, University of Washington, Seattle, WA, USA - Kinahan@uw.edu.

The Quarterly Journal of Nuclear Medicine and Molecular Imaging : Official Publication of the Italian Association of Nuclear Medicine (AIMN) [And] the International Association of Radiopharmacology (IAR), [And] Section of the Society Of
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Summary

Positron emission tomography (PET) and single-photon emission computed tomography (SPECT) offer sensitive imaging for disease monitoring. This review details how multimodal imaging corrects for photon attenuation and scatter, enhancing quantitative accuracy.

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Area of Science:

  • Medical Imaging Physics
  • Nuclear Medicine
  • Radiopharmaceutical Science

Background:

  • Positron emission tomography (PET) and single-photon emission computed tomography (SPECT) provide high sensitivity and direct measurement of radiotracer concentration.
  • This quantitative capability is crucial for accurate disease monitoring, clinical management, and therapeutic development.
  • Accurate quantification requires correction for physical effects like photon attenuation and scatter.

Purpose of the Study:

  • To review the fundamental physics of photon attenuation and scatter in PET and SPECT imaging.
  • To summarize technical considerations for quantitative accuracy in multimodal SPECT/CT, PET/CT, and PET/MR imaging.
  • To discuss methods for addressing challenges in multimodal quantification.

Main Methods:

  • Review of basic physics principles governing photon attenuation and scatter.
  • Analysis of technical considerations for quantitative SPECT and PET imaging using complementary CT or MR data.
  • Summary of methods to overcome challenges in dual-modality SPECT/CT, PET/CT, and PET/MR quantification.

Main Results:

  • Photon attenuation and scatter are significant confounding factors in quantitative PET and SPECT.
  • Multimodal imaging (SPECT/CT, PET/CT, PET/MR) leverages complementary data for corrections.
  • Each multimodal combination presents unique challenges for accurate radiotracer quantification.

Conclusions:

  • Accurate quantification in PET and SPECT relies on precise estimation of physical effects.
  • Multimodal imaging offers powerful tools for improving quantitative accuracy in nuclear medicine.
  • Addressing specific challenges in SPECT/CT, PET/CT, and PET/MR is key to realizing their full quantitative potential.