Performance evaluation of a high resolution dedicated breast PET scanner

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiology

Background:

• Whole-body PET (WB-PET) scans have limitations in detecting early-stage breast cancers due to lower spatial resolution.
• Dedicated breast PET (DbPET) systems have been developed to enhance imaging of the breast with improved resolution.
• Evaluating the performance of novel DbPET systems is crucial for clinical adoption.

Purpose of the Study:

• To evaluate the performance of a high-resolution dedicated breast PET scanner, the Mammi-PET (Oncovision).
• To assess the scanner's capabilities in terms of sensitivity, uniformity, energy, and spatial resolution.
• To compare the lesion detectability of DbPET with WB-PET.

Main Methods:

• Performance metrics including sensitivity, uniformity, and energy resolution were measured.
• Spheres of varying sizes (2.5-6 mm) and activity concentrations were embedded in a breast phantom to simulate lesions with different lesion-to-background ratios (LBR).
• Reporter-based detection studies were conducted, varying acquisition time, LBR, sphere size, and reconstruction parameters, with comparisons to WB-PET scans.

Main Results:

• The Mammi-PET system achieved a peak sensitivity of 2.0% and spatial resolution of 1.7-2.0 mm.
• Excellent sphere detectability (100%) was achieved for spheres ≥4 mm with LBR ≥10 and acquisition times >3 min.
• DbPET demonstrated superior lesion detectability compared to WB-PET for smaller lesions (≥5 mm) under specific acquisition conditions.

Conclusions:

• The Mammi-PET system exhibits good performance characteristics for clinical application in breast imaging.
• The DbPET scanner offers improved spatial resolution and enhanced detectability of small breast lesions compared to WB-PET.
• These findings support the clinical utility of dedicated breast PET imaging for early-stage breast cancer detection.