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Data-driven gated PET/CT: implications for lesion segmentation and quantitation.

M Allan Thomas1, Tinsu Pan2

  • 1Department of Imaging Physics, UT MD Anderson Cancer Center, Houston, TX, 77030, USA.

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Summary
This summary is machine-generated.

Data-driven gating (DDG)-PET/CT improves quantitation and lesion segmentation by addressing motion and misregistration. Combining DDG-PET with DDG-CT is essential for fully realizing its clinical benefits.

Keywords:
Data-driven gatingMisregistrationPET/CTSUV

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Area of Science:

  • Medical Imaging
  • Radiology
  • Nuclear Medicine

Background:

  • Data-driven gating (DDG) enhances PET quantitation and mitigates patient motion artifacts.
  • Misregistration between DDG-PET and CT, due to differing temporal resolutions, can impact accuracy.
  • A novel DDG-PET/CT method was developed to assess these effects.

Purpose of the Study:

  • To evaluate the impact of misregistration and respiratory motion on PET quantitation and lesion segmentation.
  • To compare different attenuation correction methods, including average CT (ACT) and DDG-CT.
  • To assess the efficacy of a new DDG-PET/CT technique.

Main Methods:

  • A low-dose cine-CT was acquired for both ACT and DDG-CT generation.
  • Four methods were compared: baseline PET/CT, PET/ACT, DDG-PET (helical CT AC), and DDG-PET/CT (DDG-CT AC).
  • End-expiration (EE) PET and CT data were extracted; 91 lesions were analyzed for SUVmax, LG, volume, CCD, and DICE coefficients.

Main Results:

  • DDG-PET/CT showed significant changes in SUVmax (66±66%) and lesion volume (-26±40%) compared to baseline.
  • Lesion glycolysis (LG) was not significantly different with DDG-PET/CT, unlike PET/ACT and DDG-PET.
  • Motion correction impact was reduced by misregistration; DDG-PET/CT improved registration but motion correction was more affected.

Conclusions:

  • The benefits of DDG-PET for accurate quantitation and segmentation are maximized only when combined with DDG-CT.
  • Diminished impact of DDG-PET motion correction occurs with increasing misregistration.
  • Simultaneous correction for misregistration and motion is crucial for optimizing clinical PET/CT utility.