Analysis of posterior echoes using reconstructed vertical ultrasound images |
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Authors: | Michiko Sato Hideaki Ishida Kei Konno Tomoya Komatsuda Kayoko Furukawa Mamiko Yamada Hitoshi Yagisawa Yasuo Yoshida Sumio Watanabe |
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Institution: | (1) First Department of Internal Medicine, Akita University School of Medicine, Akita, Japan;(2) Center of Diagnostic Ultrasound, Akita Red Cross Hospital, 222-1 Saruta Kamikitade, Akita 010-1495, Japan |
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Abstract: | Purpose To evaluate the role of vertical images reconstructed using 3-D data in the analysis of posterior echoes.
Methods Reconstructed vertical images of US phantoms with the following artifacts were retrieved and analyzed: acoustic shadowing
(clean and dirty); posterior echo enhancement (with/without lateral shadowing); and reverberation artifacts (clean and dirty).
Results For acoustic shadowing, a stone and posterior clean acoustic shadowing were imaged as an echogenic mass or an echogenic ring
containing a central echo-free area. However, the stone and dirty acoustic shadowing were imaged as an echogenic mass or an
echogenic mass consisting of many fine echo spots disseminated throughout the whole mass. For posterior echo enhancement,
when lateral shadowing is present, the cyst and posterior echo enhancement are imaged as a round anechoic mass or a triple
circle consisting of a thin anechoic outer rim, an echogenic ring, and an anechoic center. However, when lateral shadowing
is absent, they are imaged as a round anechoic mass or a double circle consisting of an echogenic outer rim and an anechoic
center. For clean reverberation artifacts and dirty reverberation artifacts, vertical images of clean reverberation artifacts
consist of either a homogeneous echogenic area or an absent signal. However, vertical images of dirty reverberation artifacts
consist of a homogeneous echogenic area and an area consisting of fine echo spots.
Conclusion Our study suggests that reconstructed, previously unattainable, vertical plane images help us better understand the mode of
posterior echoes. |
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Keywords: | 3-D ultrasound artifact posterior echo reverberation |
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