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Cine 4DCT imaging artifacts: Quantification and correlations with scanning parameters and target kinetics.

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Four-dimensional computed tomography (4DCT) artifacts from gantry speed and sampling frequency impact radiotherapy planning. Optimizing scanning parameters like rotation time and sampling ratio minimizes these 4DCT artifacts for improved accuracy.

Keywords:
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Area of Science:

  • Medical Imaging
  • Radiotherapy Physics
  • Image Analysis

Background:

  • Four-dimensional computed tomography (4DCT) is crucial for radiotherapy planning, enabling visualization of moving targets.
  • Image artifacts in 4DCT can introduce uncertainties in treatment planning and delivery.
  • Understanding artifact origins is essential for mitigating their impact on clinical outcomes.

Purpose of the Study:

  • To investigate the correlation between 4DCT artifacts, scanning parameters, and target kinetics.
  • To quantify the uncertainty introduced by 4DCT artifacts in radiotherapy treatment planning.
  • To classify and analyze artifacts related to finite gantry rotation speed (FGS) and finite sampling frequency (FSF).

Main Methods:

  • FGS artifacts were studied using a respiratory phantom simulating patient motion.
  • FSF artifacts were investigated through Monte Carlo simulations of acquisition timing.
  • Correlations between artifact severity, gantry rotation time (Trot), target velocity (v), and sampling ratio (SR) were analyzed.

Main Results:

  • FGS localization error was found to be comparable to voxel dimensions.
  • FGS artifacts correlated with Trot, target velocity, and their interaction.
  • FSF artifacts correlated with the sampling ratio (Tresp/Ts).
  • Under specific conditions (Trot=0.5s, SR>15, v<2cm/s), FGS and FSF artifacts became comparable to other uncertainty sources.

Conclusions:

  • 4DCT artifacts are influenced by scanning parameters and target motion.
  • Optimizing Trot and SR can minimize FGS and FSF artifacts, reducing uncertainty in radiotherapy planning.
  • Patient-specific analysis is recommended for non-ideal breathing patterns, high target velocities, or amplitudes.