Diffusion tensor magnetic resonance imaging of the normal breast

Area of Science:

• Radiology and Imaging Science
• Biomedical Engineering
• Medical Physics

Background:

• Diffusion tensor imaging (DTI) offers insights into tissue microstructure.
• Understanding normal breast parenchyma diffusion characteristics is essential for accurate disease detection.
• Anisotropy of water diffusion in breast tissue has not been extensively characterized.

Purpose of the Study:

• To evaluate diffusion anisotropy in normal breast parenchyma using DTI.
• To determine the range and repeatability of DTI parameters in healthy breast tissue.
• To establish normative values for DTI metrics in the female breast.

Main Methods:

• 12 healthy females underwent 1.5 T DTI using echo planar imaging.
• Diffusion tensor imaging parameters, including eigenvalues, fractional anisotropy (FA), and apparent diffusion coefficient (ADC), were measured.
• Measurements were taken in anterior, central, and posterior breast regions.

Main Results:

• Mean normal breast DTI values were established, with FA=0.29+/-0.05 and ADC=1.95+/-0.24 x 10(-3) mm(2)/s at b=600 s/mm(2).
• Significant regional variations in FA and ADC were observed (P<.05), with higher ADC centrally and higher FA posteriorly.
• Repeatability showed coefficients of variation of 4.5% for ADC and 11.4% for FA.

Conclusions:

• Water diffusion is anisotropic in normal breast tissue.
• This study provides a normative range for breast fractional anisotropy (FA) values.
• Breast region and b-value influence DTI measurements, requiring consideration for clinical standardization.