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Updated: Feb 1, 2026

Robot-Assisted Transcanal Endoscopic Ear Surgery for Congenital Cholesteatoma
Published on: December 15, 2023
Improved Visualization of Middle Ear Cholesteatoma with Computed Diffusion-weighted Imaging
Koji Yamashita1, Akio Hiwatashi1, Osamu Togao1
1Department of Clinical Radiology, Graduate School of Medical Sciences, Kyushu University.
Abstract:
Computed DWI (cDWI) is a mathematical technique that calculates arbitrary higher b value images from at least two different lower b values. In addition, the removal of high intensity noise with image processing on cDWI could improve cholesteatoma-background contrast-to-noise ratio (CNR). In the present study, noise reduction was performed by the cut-off values of apparent diffusion coefficient (ADC) less than 0 and 0.4 × 10-3 s/mm2. The cholesteatoma to non-cholesteatoma CNR was increased using a noise reduction algorithm for clinical setting.
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