Motion correction options in PET/MRI.

Area of Science:

• Medical Imaging
• Biophysics
• Radiochemistry

Background:

• Subject motion is a significant challenge in clinical and research imaging, impacting image quality and diagnostic accuracy.
• Breathing and cardiac activity are major sources of periodic motion in whole-body PET and MRI studies.
• Non-periodic motion also occurs, and external monitoring devices may not fully capture complex internal organ movements.

Purpose of the Study:

• To explore advanced methods for characterizing and correcting subject motion in PET and MRI studies.
• To develop a comprehensive workflow for motion management in routine clinical imaging.
• To improve the quality of PET and MRI images by minimizing motion-related artifacts.

Main Methods:

• Utilizing PET and/or MRI data to build detailed motion models of internal organs.
• Integrating information from external monitoring devices (e.g., respiratory bellows, ECG) with internal motion data.
• Applying motion models to PET data during or after image reconstruction for correction.

Main Results:

• Characterization of complex internal organ motion beyond what external devices can provide.
• Potential for generating motion-free or motion-corrected PET images using detailed motion fields.
• Demonstration of methods to minimize the effects of motion on collected imaging data.

Conclusions:

• Detailed motion field information derived from imaging data can significantly improve image quality.
• A comprehensive workflow integrating motion control, characterization, and correction is crucial for clinical applications.
• Implementing these advanced motion correction techniques holds great potential for enhancing diagnostic accuracy and reducing artifacts in PET and MRI studies.