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Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
Published on: December 15, 2014
Más allá del compromiso: Logro de alta resolución espacial y temporal en RM de mama con DCE mediante una novedosa
Narine Mesropyan1, Christoph Katemann2, Asadeh Lakghomi1
1Department of Diagnostic and Interventional Radiology, University Hospital Bonn, Venusberg-Campus 1, 53127 Bonn, Germany (N.M., A.L., C.L., C.K., A.I., T.D., C.C.P., A.S., J.A.L.).
Rationale And Objectives:
To clinically implement and evaluate a 4D diamond-shaped pseudo-golden angle stack-of-stars acquisition with k-space weighted image contrast reconstruction for breast dynamic contrast-enhanced MRI (4D-DCE), assessing image quality, diagnostic confidence, and Breast Imaging Reporting and Data System (BI-RADS) agreement across conventional and ultrafast protocols.
Material And Methods:
This retrospective study included female patients who underwent breast MRI at 3 T using the 4D-DCE sequence. Three protocol types were generated: (1) conventional (4 × 60 s), (2) ultrafast (20 × 3 s), and (3) combined (ultrafast followed by 3 × 60 s). Two readers independently or in consensus rated image quality (overall quality, artifacts, sharpness, lesion conspicuity, and morphology) and diagnostic confidence using a 5-point Likert scale. BI-RADS scores were compared to the final reference standard (histology or ≥2-year imaging follow-up). Agreement was assessed using Cohen's kappa.
Results:
A total of 167 patients (mean age: 59 ± 11 years) were included. Despite high temporal resolution of the ultrafast 4D-DCE, image quality was good to excellent and was comparable to the standard-resolution post-contrast T1 mDixon sequence (e.g., overall quality: 4.8 ± 0.4 vs. 4.8 ± 0.3, P =0.99). The combined 4D-DCE protocol yielded the highest diagnostic confidence by BI-RADS assignment in both readers, with the most pronounced improvement observed in patients with high background parenchymal enhancement (e.g., reader 1: 3.2 ± 0.6 [conventional] vs. 4.2 ± 0.4 [ultrafast] vs. 4.9 ± 0.3 [combined], P <0.001). BI-RADS agreement with the final reference standard was good to excellent across all DCE protocols, with the highest agreement achieved using the combined 4D-DCE (e.g., reader 1: κ = 0.89, 95% CI: 0.84-0.95).
Conclusion:
The proposed 4D-DCE technique enables robust breast DCE-MRI with high spatial and temporal resolution. Combining ultrafast and conventional acquisitions within a single protocol improves diagnostic confidence and BI-RADS agreement.
