New Data-Driven Gated PET/CT Free of Misregistration Artifacts

Area of Science:

• Medical Imaging
• Radiology
• Nuclear Medicine

Background:

• Positron emission tomography (PET)/computed tomography (CT) imaging is crucial for diagnosis and monitoring.
• Misregistration between PET and CT data can lead to inaccurate quantification and interpretation.
• Improving the accuracy of PET/CT registration is essential for reliable clinical outcomes.

Purpose of the Study:

• To develop and evaluate a novel data-driven gated (DDG) PET/CT technique.
• To enhance the registration accuracy between CT and DDG PET data.
• To assess the impact of DDG PET/CT on image quantification and radiation dose.

Main Methods:

• Acquired repeat PET/CT and cine CT scans for misregistration mitigation.
• Derived end-expiration phase CT as DDG CT for attenuation correction.
• Compared average PET/CT, DDG PET, and DDG PET/CT for registration and quantification.

Main Results:

• DDG PET/CT significantly improved registration and quantification compared to DDG PET.
• Cine CT resulted in lower scan coverage and effective radiation dose than repeat CT.
• SUVmax increased consecutively from baseline PET/CT to DDG PET/CT, indicating improved quantification.

Conclusions:

• The DDG PET/CT approach effectively alleviates misregistration artifacts.
• DDG PET/CT offers improved quantification and registration over DDG PET.
• The use of cine CT in DDG PET/CT reduces radiation dose and scan coverage.