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Related Experiment Videos

Optimal CT breathing protocol for combined thoracic PET/CT.

Matthew D Gilman1, Alan J Fischman, Vikram Krishnasetty

  • 1Department of Radiology, Massachusetts General Hospital, FND 202, 55 Fruit St., Boston, MA 02114, USA.

AJR. American Journal of Roentgenology
|October 24, 2006
PubMed
Summary

Optimal breathing protocols for thoracic PET/CT scans include expiration, mid-breath-hold, and quiet breathing, ensuring excellent image alignment. Quiet breathing is recommended for patient comfort during CT acquisition.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Radiology

Background:

  • Positron Emission Tomography/Computed Tomography (PET/CT) is crucial for thoracic imaging.
  • Image quality in thoracic PET/CT is significantly influenced by patient breathing during CT acquisition.
  • Optimizing breathing protocols is essential for accurate image fusion and diagnostic interpretation.

Purpose of the Study:

  • To identify the optimal breathing protocol for combined PET/CT scans of the thorax.
  • To evaluate the impact of different breathing techniques on the alignment of PET and CT data.
  • To determine the best protocol for achieving excellent image fusion, particularly at critical anatomical landmarks.

Main Methods:

  • Eighty combined 18F-FDG PET/CT scans were analyzed across 64 patients.

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  • Five distinct CT breathing protocols were assessed: expiration, mid suspended breath-hold, quiet breathing, small breath in, and regular breath in.
  • Image alignment quality was quantitatively rated at the diaphragm, aortic arch, heart, thoracic spine, and lung apices.

    • Main Results:

    • Excellent PET/CT alignment was achieved with expiration, mid suspended breath-hold, and quiet breathing protocols.
    • No statistically significant differences in alignment were observed between these three optimal protocols.
    • Significant misalignment, particularly at the diaphragm and heart, occurred with small and regular breath-in techniques (p < 0.0001).

    Conclusions:

    • Thoracic PET/CT image fusion is excellent using expiration, mid suspended breath-hold, or quiet breathing protocols.
    • These protocols ensure superior alignment at the diaphragm and heart compared to breath-in techniques.
    • Quiet breathing is recommended for optimal patient comfort and high-quality attenuation-corrected CT data acquisition.