A 2D/3D hybrid PET scanner with rotating partial slice-septa and its quantitative procedures

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Positron Emission Tomography (PET)

Background:

• Current PET scanners face challenges in simultaneous 3D/2D data acquisition and scatter correction.
• Accurate attenuation correction and scatter removal are crucial for quantitative PET imaging.

Purpose of the Study:

• To introduce a PET scanner with rotating partial slice-septa for simultaneous 3D emission and 2D transmission imaging.
• To present a novel 'summation method' for image reconstruction, enhancing scatter correction capabilities.
• To evaluate the performance of the scanner and reconstruction method through simulations.

Main Methods:

• The PET scanner utilizes rotating partial slice-septa to acquire both 3D and 2D coincidence events simultaneously.
• Transmission scans for attenuation correction are performed in 2D mode using rotating rod sources.
• A new 'summation method' reconstructs image components from 3D and 2D data, employing high-pass filtering for scatter reduction.

Main Results:

• Simulations show rotating partial septa achieve scatter-to-true ratios comparable to full septa with proper design.
• The proposed summation method effectively removes scatter from 3D data, improving robustness.
• The scanner enables simultaneous 3D-emission/2D-transmission scanning with minimal cross-talk.

Conclusions:

• The developed PET scanner and summation method offer a promising approach for improved quantitative imaging.
• Simultaneous 3D/2D acquisition and advanced scatter correction enhance image quality and reduce artifacts.
• This technology has the potential to advance dynamic PET studies and quantitative analysis.