Initial experience with a PET/computed tomography system using silicon photomultiplier detectors

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiology

Background:

• Positron Emission Tomography/Computed Tomography (PET/CT) is crucial for disease detection and staging.
• Advancements in detector technology, such as silicon photomultiplier (SiPM), aim to improve image quality.
• Evaluating new PET/CT systems against established ones is essential for clinical adoption.

Purpose of the Study:

• To report the initial clinical use of a novel SiPM-based PET/CT scanner.
• To compare the image quality of the new SiPM PET/CT system against standard PET/CT scanners.
• To assess the impact of different reconstruction algorithms on image quality.

Main Methods:

• Seventy-two patients underwent scanning on both a standard PET/CT and the new SiPM PET/CT system.
• Images were reconstructed using non-time-of-flight (non-TOF), TOF alone, and TOF with BSREM algorithms on the new system.
• Three blinded readers assessed image quality using a Likert scale, and SUVmax was measured for the most avid lesion.

Main Results:

• The SiPM-based PET/CT system demonstrated significantly higher image quality and SUV measurements compared to standard scanners (P < 0.001).
• Image quality scores improved progressively with non-TOF, TOF alone, and TOF+BSREM reconstruction (mean scores: 3.1, 3.9, 4.3, 5.0).
• Mean SUVmax values also increased with advanced reconstruction: 8.8 (standard), 10.3 (non-TOF), 10.7 (TOF), and 13.3 (TOF+BSREM).

Conclusions:

• The SiPM-based PET/CT system provides superior image quality over standard BGO and LYSO scanners.
• The use of time-of-flight (TOF) and BSREM reconstruction further enhances image quality and SUV measurements.
• This improved performance may lead to better detection of small lesions and more accurate disease staging.