Diffusion-weighted Imaging of the Breast: Comparison of B-values 1000 s/mm(2) and 1500 s/mm(2)

作者：Woodhams Reiko^*; Inoue Yusuke; Ramadan Saadallah; Hata Hirofumi; Ozaki Masanori

来源：Magnetic Resonance in Medical Sciences, 2013, 12(3): 229-234.

DOI：10.2463/mrms.2012-0028

• b-value
• breast
• diffusion-weighted imaging

Purpose: We compared diffusion-weighted imaging (DWI) of the breast using 2 different b-values to determine the optimal b-value for greatest signal contrast between tumors and normal tissue of the breast. %26lt;br%26gt;Materials and Methods: We performed DWI of the breast at b-values of 1000 s/mm(2) and 1500 s/mm(2) in 120 patients (121 lesions, 19 benign, 102 malignant) and visually scored image quality with regard to artifact and visibility of tumors. We quantitatively evaluated the signal-to-noise ratio (SNR) of the tumor and contrast-to-noise ratio (CNR) and contrast ratio (CR) between the tumor and normal breast parenchyma. %26lt;br%26gt;Results: The CR of invasive carcinoma (IC), ductal carcinoma in situ (DCIS), and benign tumors significantly improved with b = 1500 s/mm(2) compared with b = 1000 s/mm(2). The SNR and CNR were significantly lower with b = 1500 s/mm(2) than b = 1000 s/mm(2) despite the increasing number of excitations at b = 1500 s/mm(2). At b = 1500 s/mm(2), the difference in SNR, CNR, and CR between IC and DCIS and benign tumors was statistically significant. %26lt;br%26gt;Conclusion: DWI may depict breast tumors more clearly with b = 1500 s/mm(2) than b = 1000 s/mm(2).

• 出版日期2013