A phantom using titanium and Landolt rings for image quality evaluation in mammography

Area of Science:

• Medical Imaging
• Radiologic Technology
• Diagnostic Imaging

Background:

• Digital mammography systems require robust image quality evaluation.
• Existing phantoms used in Europe and the US have limitations.
• Standardized assessment is crucial for diagnostic accuracy.

Purpose of the Study:

• To introduce and validate a novel phantom for digital mammography image quality assessment.
• To compare the performance of the new phantom against established European and US protocols.
• To establish a sensitive, efficient, and reliable alternative evaluation method.

Main Methods:

• The phantom incorporates Landolt rings for subjective evaluation and signal-difference-to-noise ratio (SDNR) objects for objective assessment.
• Images were acquired across a range of exposures (15-160 mAs) and average glandular doses (0.2-2 mGy).
• Results were compared with European Protocol for the Quality Control of the Clinical Use of Mammography (EPQC) and American College of Radiology (ACR) protocols.

Main Results:

• Specific scores for Landolt tests (19 and 8.5) and SDNR (20 and 11) were found equivalent to EPQC and ACR acceptable limits.
• The phantom's tests demonstrated sensitivity to anatomical variations in breast thickness and density.
• The simplified evaluation method proved effective across different exposure levels.

Conclusions:

• The presented phantom provides a sensitive, efficient, and reliable method for evaluating digital mammography image quality.
• This novel approach aligns with and is comparable to established international quality control standards.
• The phantom's ability to account for anatomical variations enhances its clinical relevance for mammography systems.