Breast Cancer Conspicuity on Computed Versus Acquired High b-Value Diffusion-Weighted MRI

Area of Science:

• Magnetic Resonance Imaging
• Oncology
• Radiology

Background:

• Diffusion-weighted imaging (DWI) is crucial for breast cancer detection.
• Synthesizing high b-value images from lower b-values can potentially improve lesion conspicuity.
• Evaluating the efficacy of computed versus acquired DWI is essential for optimizing breast MRI protocols.

Purpose of the Study:

• To compare lesion conspicuity on computed versus acquired high b-value DWI in breast cancer.
• To identify clinical factors influencing the optimal b-value for DWI in breast MRI.
• To assess the trade-offs between image quality and flexibility in DWI acquisition.

Main Methods:

• Prospective enrollment of women with newly diagnosed breast cancer undergoing 3T breast MRI with DWI.
• Quantitative measurement of lesion contrast-to-noise ratio (CNR) across various b-values for both computed and acquired DWI.
• Qualitative assessment of lesion visibility by three independent readers, including selection of optimal b-values.

Main Results:

• Lesion CNR was slightly higher on acquired DWI compared to computed DWI (p=0.018).
• Reader assessment showed no significant difference in lesion visibility between computed and acquired DWI (p=0.36).
• Optimal b-values were influenced by patient age (younger preferred higher b-values) and breast density (denser breasts preferred higher b-values).

Conclusions:

• Computed high b-value DWI provides comparable lesion visibility to acquired DWI, despite a slight reduction in CNR.
• The flexibility of computing high b-value images allows for adjustable b-value selection during interpretation.
• This technique offers a valuable alternative for enhancing breast cancer detection and characterization in MRI.