PET-MR imaging using a tri-modality PET/CT-MR system with a dedicated shuttle in clinical routine

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiology

Background:

• Tri-modality PET/CT-MRI systems integrate Positron Emission Tomography (PET), Computed Tomography (CT), and Magnetic Resonance Imaging (MRI).
• Current systems require patient transfer between individual scanners, limiting efficiency and potentially introducing misalignments.

Purpose of the Study:

• To evaluate the advantages and disadvantages of a tri-modality PET/CT-MRI system.
• To assess the system's utility for comparative imaging studies and disease characterization.
• To explore the development of novel attenuation correction algorithms.

Main Methods:

• Utilizing a dedicated shuttle for seamless patient transfer between PET, CT, and MRI components.
• Performing comparative imaging studies of PET/MRI versus PET/CT within the same patient session.
• Leveraging combined imaging data for comprehensive disease characterization.

Main Results:

• The system enables true CT-based attenuation correction and reliable PET quantification.
• Offers enhanced flexibility for patient throughput and comparative studies without repeat PET scans.
• Potential for higher radiation dose (up to 3 mSv) and longer acquisition times compared to single modalities.

Conclusions:

• Tri-modality PET/CT-MRI facilitates simultaneous comparative imaging and disease characterization.
• The integrated system aids in developing robust attenuation correction algorithms.
• Despite drawbacks like increased radiation exposure, the system enhances imaging flexibility and research capabilities.