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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiology

Background:

  • Positron Emission Tomography (PET) attenuation correction (AC) is crucial for accurate quantification.
  • Cine average computed tomography (CACT) is a standard AC method but involves higher radiation doses.
  • Interpolated average computed tomography (IACT) was previously proposed as a low-dose alternative.

Purpose of the Study:

  • To evaluate the performance of IACT for PET attenuation correction.
  • To assess IACT's effectiveness in characterizing thoracic lesions with varying sizes and uptake.
  • To compare IACT with CACT and helical CT (HCT) in both simulated and clinical settings.

Main Methods:

  • Simulated noisy 18F-FDG PET data using the XCAT phantom with respiratory motion.
  • Generated IACT from end-inspiration and end-expiration CT phases.
  • Reconstructed PET images using CACT, IACT, and HCT for attenuation correction.
  • Analyzed target-to-background ratios (TBRs) and mean standardized uptake values (SUVs) for simulated and clinical lesions.

Main Results:

  • IACT showed higher similarity to CACT than HCT in terms of TBRs and mean SUV for both simulations and clinical data.
  • PET images corrected with HCT exhibited significant artifacts.
  • Differences between CACT/IACT and HCT were more pronounced for lesions in the lower lung regions.

Conclusions:

  • IACT is a robust and low-dose method for PET attenuation correction.
  • IACT improves thoracic lesion localization and quantification.
  • IACT demonstrates effectiveness across a range of lesion characteristics.