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

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  • KAMIYAMA Naohisa
    Ultrasound Division, GE Healthcare
  • SUMINO Yasukiyo
    Department of Gastroenterology and Hepatology, Toho University Omori Medical Center
  • MARUYAMA Kenichi
    Department of Clinical Functional Physiology, Toho University Omori Medical Center
  • MATSUKIYO Yasushi
    Department of Gastroenterology and Hepatology, Toho University Omori Medical Center
  • WAKUI Noritaka
    Department of Gastroenterology and Hepatology, Toho University Omori Medical Center
  • SHINOHARA Masao
    Department of Gastroenterology and Hepatology, Toho University Omori Medical Center

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Other Title
  • 脂肪肝実質に出現する“簾状エコー”の発生機序に関する考察
  • Discussion of mechanism behind “bamboo blind” sign observed in fatty liver parenchyma

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Description

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.

Journal

  • Choonpa Igaku

    Choonpa Igaku 43 (5), 655-662, 2016

    The Japan Society of Ultrasonics in Medicine

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