Microcalcification detectability using a bench-top prototype photon-counting breast CT based on a Si strip detector

Area of Science:

• Medical Imaging
• Radiology
• Photon-counting technology

Background:

• Breast microcalcifications (μCa) are key indicators of breast cancer.
• Accurate detection of μCa is crucial for early diagnosis.
• Current imaging techniques have limitations in sensitivity and dose.

Purpose of the Study:

• To assess the feasibility of a dedicated breast computed tomography (CT) system using photon-counting silicon (Si) strip detectors for μCa detection.
• To determine the smallest detectable μCa size with this novel system.

Main Methods:

• Simulations of a photon-counting breast CT system and a prototype were performed using MATLAB.
• Phantoms simulating average breast tissue with varying μCa sizes (100-215 μm) were used.
• Reader studies evaluated μCa detectability using the area under the receiver operating characteristic curve (AUC).

Main Results:

• Simulations demonstrated high detection accuracy (AUC > 0.89) for μCa > 120 μm at 3 mGy mean glandular dose (MGD).
• Experimental results showed high accuracy (AUC > 0.98) for μCa > 140 μm at 1.2 mGy entrance exposure.
• The system proved effective in detecting microcalcifications across different sizes and doses.

Conclusions:

• The photon-counting breast CT system with Si strip detectors shows potential for superior μCa detection.
• This technology may offer improved image quality at reduced radiation doses compared to mammography.
• Further development could enhance early breast cancer diagnosis.