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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Improved attenuation correction registration for FDG PET/CT images using data-driven gating (DDG)-based motion match.

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Motion-matched CT attenuation correction (MMCTAC) significantly reduces respiratory motion artifacts in PET/CT scans. This improved imaging enhances lesion detectability and diagnostic confidence for patients with high motion.

Keywords:
Attenuation correctionCTPETRespiratory motion

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiology

Background:

  • Advancements in PET/CT imaging have highlighted the impact of respiratory motion artifacts on image quality.
  • The motion-match CT (MMCT) algorithm aims to mitigate these artifacts by aligning CT data with PET data.
  • MMCT-attenuation correction (MMCTAC) is proposed to improve whole-body FDG PET/CT reconstruction.

Purpose of the Study:

  • To evaluate the effectiveness of MMCTAC in reducing respiratory motion artifacts in FDG PET/CT.
  • To compare lesion detectability and image quality between MMCTAC and standard attenuation correction (normAC).

Main Methods:

  • A cohort of 145 whole-body FDG PET/CT scans was analyzed, focusing on 23 high-motion patients with 36 small lesions.
  • PET data were reconstructed using BSREM with ungated and gated data, employing both normAC and MMCTAC.
  • An experienced radiologist performed qualitative analysis, scoring lesion detectability, diagnostic confidence, and image quality on a 5-point Likert scale.

Main Results:

  • Clinicians ranked MMCTAC images higher than normAC images in 52% of cases.
  • MMCTAC reconstructions showed positive mean differences in lesion detectability and diagnostic confidence compared to normAC.
  • SUVmax values for lesions were significantly increased (p < 0.05) with MMCTAC across all reconstructions.

Conclusions:

  • The MMCT algorithm effectively reduces respiratory motion artifacts in FDG PET/CT images.
  • MMCTAC improves diagnostic capability for assessing lesions, particularly in the thorax and upper abdomen.
  • This technique enhances overall image quality and diagnostic confidence in PET/CT imaging.