Dose reduction in automatic optimization parameter of full field digital mammography: breast phantom study

Area of Science:

• Radiological imaging
• Medical physics

Background:

• Digital mammography utilizes automatic optimization of parameters (AOP) to balance image quality and radiation dose.
• Evaluating different AOP modes is crucial for optimizing patient safety and diagnostic accuracy.

Purpose of the Study:

• To assess the impact of three AOP modes (Standard, Contrast, and Dose) in digital mammography on radiation dose and image quality.
• To compare the performance of AOP modes across varying phantom thicknesses and glandularity.

Main Methods:

• Utilized Computerized Imaging Reference Systems phantoms (12 total) with diverse thickness and glandularity.
• Analyzed average glandular dose (AGD) and entrance surface exposure (ESE) for each AOP mode.
• Assessed image quality by independent radiologist evaluation of phantom objects.

Main Results:

• The DOSE mode demonstrated significant dose reduction (19.1-50%) compared to Standard and Contrast modes, with acceptable image quality.
• Image quality scores for masses and specks were highest in Contrast mode, while fiber detection showed no significant difference across modes.
• Radiation dose metrics (AGD, ESE, mAs) and kVp were correlated with breast thickness but not glandularity.

Conclusions:

• The DOSE mode is recommended for its superior dose reduction capabilities in digital mammography.
• Knowledge of AOP modes allows for tailored use, minimizing radiation exposure while ensuring diagnostic image quality.
• Optimizing AOP mode selection based on patient characteristics can reduce unnecessary radiation exposure.