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Abstract #4660

Detectability and anatomical location identification of cholesteatoma with thin-slice non-echo planar imaging diffusion-weighted image (nEPID) using fused nEPID and CT(nEPID-CT)

Toshitada Hiraka1, Masafumi Kanoto1, Yuuki Toyoguti1, Yoshihiro Konno1, Yasuhiro Sugai1, and Takaaki Hosoya1

1Diagnostic Radiology, Yamagata University Faculty of Medicine, Yamagata, Japan

Non-echo planar imaging diffusion-weighted imaging (nEPID) is a useful tool for diagnosing middle ear cholesteatoma. The cut-off value of nEPID has not yet been determined, however, as fused thin-slice nEPID and computed tomography (nEPID-CT) color imaging cannot correctly distinguish cholesteatoma from other soft tissue. We examined the detectability of cholesteatoma with nEPID using nEPID-CT color images obtained as preoperative studies. The appropriate cut-off value of the signal intensity ratio on nEPID is 0.925 on the receiver operating characteristic (ROC) curve with Youden’s index. Here, we evaluate the efficacy of nEPID-CT color images based on this nEPID cut-off value.

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