Dose and spatial resolution analysis of grating-based phase-contrast mammography using an inverse Compton x-ray...

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• Screening mammography has reduced breast cancer mortality but often yields inconclusive diagnoses, leading to further examinations.
• Image quality in mammography is compromised by anatomical structure superposition and low soft tissue contrast, particularly in dense breasts.
• Phase-contrast imaging offers a potential solution to overcome these limitations in mammographic imaging.

Purpose of the Study:

• To analyze the spatial resolution of grating-based multimodal mammography.
• To estimate the mean glandular dose and discuss the benefits and drawbacks of the phase-contrast method.
• To investigate improvements in spatial resolution by comparing monochromatic grating-based mammography with standard techniques.

Main Methods:

• Utilized a mammographic phantom and a mastectomy specimen with an inverse Compton x-ray source.
• Evaluated spatial resolution with the sample in the beam path.
• Compared monochromatic grating-based mammography with standard mammography.

Main Results:

• Spatial resolution was constant or higher with monochromatic radiation.
• Contrast-to-noise ratio (CNR) was increased using the phase-contrast approach.
• Radiation dose could be reduced by up to 20%.

Conclusions:

• Phase-contrast imaging significantly improves diagnostic image quality for better tumor detection.
• Demonstrated higher spatial resolution and increased CNR in mastectomy specimens.
• Monochromatic measurements achieved equal or lower radiation doses.