Three-phase dynamic breast magnetic resonance imaging with two-way subtraction

Area of Science:

• Radiology
• Medical Imaging
• Oncology

Background:

• Breast magnetic resonance (MR) imaging is crucial for diagnosing breast lesions.
• Evaluating morphologic and kinetic features aids in differentiating benign from malignant findings.
• Standard MR techniques may have limitations in lesion characterization.

Purpose of the Study:

• To introduce a novel 3-phase dynamic breast MR imaging technique with 2-way subtraction.
• To analyze the morphologic and kinetic characteristics of malignant and benign breast lesions using this new technique.

Main Methods:

• 99 breasts from 89 women with suspicious lesions underwent 3-phase dynamic MR imaging (1 precontrast, 2 postcontrast).
• Two-way subtraction (standard and reverse) was applied to postcontrast images.
• Lesion features were assessed using the Breast Imaging Reporting and Data System MR lexicon, and classifications were compared to biopsy/follow-up results.

Main Results:

• 65.7% of lesions were malignant, 34.3% benign.
• Malignant lesions frequently exhibited malignant morphologic features (97.7% for invasive, 81.8% for DCIS) and washout kinetics (88.4% for invasive, 50.0% for DCIS).
• Sensitivity and specificity were high, particularly with combined morphologic and kinetic analysis (93.8% and 85.3%).

Conclusions:

• 3-phase dynamic breast MR imaging with 2-way subtraction and MIP is a simple, effective technique for breast lesion identification.
• Kinetic criteria improve sensitivity but may decrease specificity.
• Reverse subtraction imaging enhances confidence in diagnosing malignant non-mass-like lesions.