Cone-beam micro computed tomography dedicated to the breast.

Area of Science:

• Medical Imaging
• Radiology
• Biomedical Engineering

Background:

• Conventional mammography has limitations in detecting subtle breast abnormalities.
• Micro computed tomography (micro-CT) offers higher resolution potential for breast imaging.
• Developing dedicated breast micro-CT systems is crucial for advancing diagnostic capabilities.

Purpose of the Study:

• To develop and evaluate a novel micro computed tomography (BµCT) scanner specifically designed for breast imaging.
• To assess the system's spatial resolution and imaging performance, including phase-contrast capabilities.
• To determine the scanner's efficacy in detecting common breast pathologies like microcalcifications and masses.

Main Methods:

• Development of a BµCT scanner utilizing a high-resolution flat-panel detector and a microfocus X-ray tube.
• Evaluation of spatial resolution using the 3D modulation transfer function (MTF).
• Imaging of an anthropomorphic breast phantom to assess detection capabilities for microcalcifications and masses.

Main Results:

• The BµCT system achieved a limiting spatial resolution of 6.2 mm⁻¹ (MTF at 10%) vertically and 3.8 mm⁻¹ radially.
• The scanner demonstrated capabilities for both absorption-based and propagation-based phase-contrast imaging with edge enhancement.
• Detection of microcalcification clusters and masses was successful in a breast phantom at doses comparable to mammography.
• A proposed breast holder aims to reduce scan times to 1-2 minutes, minimizing motion artifacts.

Conclusions:

• The developed BµCT scanner provides high-resolution 3D breast imaging with promising diagnostic potential.
• The system's performance, including spatial resolution and detection capabilities, is competitive with existing micro-CT technologies.
• The BµCT technology, particularly with phase-contrast imaging and a motion-reducing holder, represents a significant advancement for breast cancer diagnosis.