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Mobile echoes in liver cysts: A form of range‐ambiguity artifact
Author(s) -
Naganuma Hiroko,
Ishida Hideaki,
Funaoka Masato,
Fujimori Shusei,
Okuyama Atushi,
Odashima Masaru,
Takeuchi Satoko,
Hanaoka Akihiko
Publication year - 2010
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.20746
Subject(s) - artifact (error) , medicine , ambiguity , pulse repetition frequency , repetition (rhetorical device) , cyst , pulse (music) , range (aeronautics) , radiology , computer vision , computer science , optics , physics , telecommunications , radar , materials science , linguistics , philosophy , detector , composite material , programming language
Purpose Faint moving echoes are occasionally encountered in large hepatic cysts, as an example of range‐ambiguity artifacts. The aim of this article is to describe the pattern of these intracystic mobile echoes, to analyze the mechanism of their formation, and to discuss options to clear them. Methods We analyzed the size and location of the hepatic cysts, the movement of the artifactual echoes, and the relationship between pulse repetition frequency (PRF) and the depth of these intracystic mobile echoes in 10 cases. In three cases examination at a lower PRF was made to ascertain whether the artifactual echoes would disappear. Results Intracystic range‐ambiguity echoes appeared when the heart was located distal to the hepatic cyst and these echoes moved according to cardiac motion. The depth of the intracystic artifacts changed according to the PRF and they disappeared at a low PRF. Conclusion Intracystic range‐ambiguity artifacts are caused by an erroneous display of the returning echoes from the heart. Knowledge of the mechanism and appearance of this artifact helps prevent misdiagnosis of internal echoes in large hepatic cysts. Observation at different PRFs is key to recognizing this artifact, and examination at lower PRFs should be done to confirm the artifactual nature of the echoes. © 2010 Wiley Periodicals, Inc. J Clin Ultrasound, 2010