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Ella L Cook1, Kuan-Hao Su2, Geoff S Higgins1

  • 1Department of Oncology, University of Oxford, Oxford, UK.

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Summary
This summary is machine-generated.

A new motion match (MM) algorithm corrects respiratory motion artefacts in PET/CT scans by phase-matching CT images to PET data. This technique improves accuracy without increasing patient radiation dose.

Keywords:
4DCTData-driven gatingRespiratory motion

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Area of Science:

  • Medical Imaging
  • Radiology
  • Nuclear Medicine

Background:

  • Respiratory motion causes artefacts in thoracic PET/CT imaging, leading to inaccurate attenuation correction.
  • Misregistration between PET and CT images due to arbitrary helical CT acquisition phases results in errors in tumour delineation and lesion uptake values.
  • Motion artefacts in PET/CT imaging can be minimized using a data-driven gating (DDG)-based motion match (MM) algorithm.

Purpose of the Study:

  • To develop and evaluate a DDG-based MM algorithm for phase-matching CT images to a specific respiratory phase (end-of-expiration).
  • To assess the algorithm's effectiveness in reducing motion artefacts in PET/CT imaging.
  • To compare algorithm-generated motion-matched CT (MMCT) images with ground truth four-dimensional CT (4DCT) phases.

Main Methods:

  • A DDG-based MM algorithm was developed to estimate the respiratory phase of helical CT (CT) data.
  • The algorithm warps the CT data to a specified respiratory phase, enabling phase-matching with PET data.
  • Four-dimensional CT (4DCT) data acquired concurrently with PET/CT served as the ground truth for comparison; liver and lesion margin positions were measured.

Main Results:

  • No significant differences were observed in lesion measurements between 4DCT and MMCT.
  • A minor but significant difference was noted in liver measurements between 4DCT and MMCT.
  • The MM algorithm successfully generated phase-matched CT images equivalent to 4DCT, demonstrating its efficacy.

Conclusions:

  • The MM algorithm effectively phase-matches helical CT to the end-of-expiration phase of a ground truth 4DCT.
  • This method reduces motion artefacts in PET/CT imaging caused by registration issues.
  • The algorithm achieves motion correction without necessitating additional radiation exposure for the patient.