Quantitative simultaneous positron emission tomography and magnetic resonance imaging

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Biomedical Engineering

Background:

• Simultaneous positron emission tomography and magnetic resonance imaging (PET-MR) is a rapidly advancing imaging technique.
• Accurate attenuation correction is crucial for quantitative PET imaging, especially in hybrid systems.
• Challenges exist in PET attenuation correction due to MR hardware, such as surface coils.

Purpose of the Study:

• To investigate the impact of MR surface coils on PET attenuation correction in PET-MR.
• To develop and validate an integrated PET reconstruction framework incorporating motion correction, attenuation correction, and point spread function modeling.
• To enhance overall PET image quality in simultaneous PET-MR studies.

Main Methods:

• Developed a novel PET reconstruction framework integrating motion correction, attenuation correction, and point spread function modeling.
• Investigated the necessity of accounting for MR surface coils in PET attenuation correction.
• Applied the framework to in vivo animal and patient PET-MR datasets.

Main Results:

• Demonstrated that MR surface coils significantly affect PET attenuation correction accuracy.
• The integrated reconstruction framework successfully corrected for motion and attenuation.
• Significant improvements in PET image quality were observed in both animal and patient studies.

Conclusions:

• Accounting for MR surface coils is essential for accurate PET attenuation correction in PET-MR.
• The proposed integrated reconstruction framework enhances PET image quality in simultaneous PET-MR.
• This work advances quantitative PET imaging in hybrid PET-MR systems.