Abstract #1132

Clinical utility of breast DWI in the assessments of breast lesions using different b values

Mami Iima^1,2, Maya Honda¹, Rie Ota¹, Masako Kataoka¹, Masakazu Toi³, and Yuji Nakamoto¹

¹Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan, ²Clinical Innovative Medicine, Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan, ³Breast Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan

We have 1) assessed the clinical utility of DWI in the diagnosis of breast lesions using DW-based BI-RADS lexicons and lesion conspicuity and 2) investigated the diagnostic performance of breast lesions based on DW-based BI-RADS category by 3 radiologists using breast DW images with b=800 or b=1500 s/mm². Agreement in DW-based BI-RADS categories tended to be higher in b1500 compared to b800 DW images. Diagnostic performance based on b800 and b1500 DW images was not uniform among 3 readers, which highlight the necessity and importance of the standardization on reading protocols and experience from DWI readers.

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