Positron emission mammography with tomographic acquisition using dual planar detectors: initial evaluations

Area of Science:

• Medical Imaging
• Nuclear Medicine
• Radiology

Background:

• Positron emission mammography (PEM) utilizes dual planar detectors for breast imaging.
• Stationary PEM systems have limitations in activity estimation and image quality.
• Tomographic acquisition in PEM (PEMT) offers potential for improved angular sampling.

Purpose of the Study:

• To compare the performance of PEM tomography (PEMT) with stationary PEM.
• To evaluate image quality and artifact reduction in PEMT.
• To assess the suitability of PEMT for guiding stereotactic core biopsies.

Main Methods:

• Utilized a compact dual-detector system for both stationary PEM and PEMT acquisition.
• Performed studies using point sources and compressed breast phantoms.
• Reconstructed images using a 3D iterative maximum likelihood expectation maximization algorithm.
• Investigated contrast and signal-to-noise ratio (SNR) trade-offs for various tumor models.

Main Results:

• PEMT effectively eliminated blurring observed in stationary PEM.
• Depth of interaction effects introduced distortions in point spread functions for PEMT.
• Streak artifacts were identified in PEMT with large detector rotation increments.
• PEMT and PEM demonstrated complementary advantages based on lesion size and detector separation.

Conclusions:

• PEMT shows promise for enhanced breast imaging and biopsy guidance.
• Further investigation is needed to optimize acquisition parameters and address artifacts in PEMT.
• The choice between PEMT and stationary PEM depends on specific imaging or quantification tasks.