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Abstract #1132

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

Mami Iima1,2, 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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