Simultaneous Emission-Transmission Tomography in an MRI Hardware Framework

Area of Science:

• Medical Imaging
• Nuclear Physics
• Biomedical Engineering

Background:

• Multi-modality imaging is crucial for complex diagnoses and treatments.
• A hybrid system combining computed tomography (CT), nuclear imaging, and magnetic resonance imaging (MRI) is highly desired for precision medicine.
• Current hybrid approaches using polarized radiotracers and MRI offer high sensitivity and resolution but lack attenuation imaging.

Purpose of the Study:

• To develop a method for simultaneous reconstruction of emission and transmission parameters using MRI-modulated gamma-ray data.
• To advance toward a simultaneous CT-SPECT-MRI system.
• To provide accurate spatiotemporal registration of morphological and molecular information.

Main Methods:

• Acquisition of synchronized datasets combining nuclear imaging with polarized radiotracers and MRI-based spatial encoding.
• Exploiting the directional preference of gamma-rays from polarized nuclei.
• Formulation of tomographic reconstruction for simultaneous emission and transmission imaging, including region of interest (ROI) analysis.

Main Results:

• Demonstrated feasibility of reconstructing both emission and transmission data simultaneously.
• Achieved accurate spatiotemporal registration of morphological and molecular imaging data.
• Numerical results support the proposed approach for hybrid imaging.

Conclusions:

• The proposed method is a significant step towards integrated CT-SPECT-MRI systems.
• Simultaneous reconstruction of emission and transmission parameters enhances the utility of hybrid imaging.
• This technique holds promise for advancing precision medicine through comprehensive in-vivo imaging.