Online Journal
IF値: 0.898(2019年)→1.314(2020年)


Journal of Medical Ultrasonics

にて英文誌のFull textを閲覧することができます.


2016 - Vol.43

Vol.43 No.05

Original Article(原著)

(0655 - 0662)


Discussion of mechanism behind “bamboo blind” sign observed in fatty liver parenchyma

神山 直久1, 住野 泰清2, 丸山 憲一3, 松清 靖2, 和久井 紀貴2, 篠原 正夫2

Naohisa KAMIYAMA1, Yasukiyo SUMINO2, Kenichi MARUYAMA3, Yasushi MATSUKIYO2, Noritaka WAKUI2, Masao SHINOHARA2

1GEヘルスケア超音波製品開発部, 2東邦大学医療センター大森病院消化器内科, 3東邦大学医療センター大森病院臨床生理機能検査部

1Ultrasound Division, GE Healthcare, 2Department of Gastroenterology and Hepatology, Toho University Omori Medical Center, 3Department of Clinical Functional Physiology, Toho University Omori Medical Center

キーワード : fatty liver, chronic liver disease, ultrasound tissue characterization, sound refraction


Purpose: To elucidate the mechanism behind the so-called “bamboo blind” sign frequently observed on B-mode images as multiple low-echoic lines in nonalcoholic steatohepatitis and highly fatty liver cases. Subjects and Methods: Six types of acoustic shadowing artifacts that might be the cause of the bamboo blind sign were defined. B-mode images were acquired for 21 fatty liver cases (inc. 9 highly fatty liver cases). The cases were then pathologically diagnosed. A phantom experiment was also performed to investigate whether the refraction occurs due to the gap of sound velocity between two different media. Results and Discussion: The mechanism of the bamboo blind sign corresponded well to the acoustic shadowing from small vessels in the liver. The phantom experiment validated the same phenomenon at a larger gap in sound velocity, which can be regarded as the same level as that in highly fatty liver cases. Conclusion: The refraction between blood vessels and highly fatty liver parenchyma with decreased sound velocity is the dominant reason for the bamboo blind sign.