Fast high-resolution lifetime image reconstruction for positron lifetime tomography.

Area of Science:

• Medical Imaging
• Biophysics
• Nuclear Medicine

Background:

• Positron lifetime is sensitive to tissue microenvironment, offering potential for disease monitoring.
• Current positron emission tomography (PET) largely overlooks positron lifetime information.
• Ortho-positronium formation influences positron lifetime prior to annihilation.

Purpose of the Study:

• To develop a novel positron lifetime image reconstruction method.
• To demonstrate the performance of this method using real PET scan data.
• To enable high-resolution positron lifetime imaging for clinical applications.

Main Methods:

• Development of the Statistical IMage reconstruction of Positron Lifetime via time-wEighting (SIMPLE) method.
• Utilizing a time-of-flight PET scanner for data acquisition.
• Reconstruction of positron lifetime images from experimental data using a ²²Na point source.

Main Results:

• The SIMPLE method achieved high-resolution positron lifetime imaging of heterogeneous tissue.
• Successfully resolved the boundary between muscle and fat tissues.
• Delivered spatial resolution comparable to conventional PET activity images with manageable computational cost.

Conclusions:

• The SIMPLE method enables high-resolution positron lifetime imaging.
• This technique has the potential to enhance disease monitoring and treatment response assessment.
• The study paves the way for the clinical translation of advanced positron lifetime imaging.