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Titolo:
Gas at abdominal US: Appearance, relevance, and analysis of artifacts
Autore:
Wilson, SR; Burns, PN; Wilkinson, LM; Simpson, DH; Muradali, D;
Indirizzi:
Univ Toronto, Dept Med Imaging, Toronto, ON M5G 2C4, Canada Univ Toronto Toronto ON Canada M5G 2C4 aging, Toronto, ON M5G 2C4, Canada Univ Toronto, Dept Med Biophys, Toronto, ON M5G 2C4, Canada Univ Toronto Toronto ON Canada M5G 2C4 ophys, Toronto, ON M5G 2C4, Canada Toronto Hosp, Dept Med Imaging, Toronto, ON M5G 2C4, Canada Toronto Hosp Toronto ON Canada M5G 2C4 aging, Toronto, ON M5G 2C4, Canada
Titolo Testata:
RADIOLOGY
fascicolo: 1, volume: 210, anno: 1999,
pagine: 113 - 123
SICI:
0033-8419(199901)210:1<113:GAAUAR>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIRROR-IMAGE ARTIFACT; PNEUMATOSIS INTESTINALIS; ULTRASOUND; FEATURES; COLOR;
Keywords:
gastrointestinal tract, US; intestines, cysts; ultrasound (US), artifact; ultrasound (US), experimental;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Wilson, SR Univdaoronto, Dept Med Imaging, 200 Elizabeth St, Toronto, ON M5G 2C4, Cana Univ Toronto 200 Elizabeth St Toronto ON Canada M5G 2C4 4, Cana
Citazione:
S.R. Wilson et al., "Gas at abdominal US: Appearance, relevance, and analysis of artifacts", RADIOLOGY, 210(1), 1999, pp. 113-123

Abstract

PURPOSE: To describe the spectrum of ultrasonographic (US) appearances of intraluminal gas, including two clinically relevant gas artifacts. MATERIALS AND METHODS: Observations were made in patients and reproduced in an animal model, an ex vivo gut preparation, and a tissue-mimicking phantom. Appearances were classified according to a physical model of the interaction between sound and collections of gas. RESULTS: Free bubbles of gas appeared as bright echogenic foci extending artifactually owing to lateral and axial blooming. This causes bubbles that abut the gut walt to enhance the layer one echo, which corresponds to the interface between the mucosa and the luminal contents. Such bubbles can alsofalsely appear to be within the gut wall itself owing to elevation averaging and thereby cause the artifact pseudo-pneumatosis intestinalis. Isolatedgroups of small bubbles created a characteristic periodicity and tapering of the distal echo pattern. In the extreme case, in which many such echoes are superimposed, "dirty shadowing" occurs. A contiguous packet of gas may cause the gut wall to appear artifactually thickened (ie, pseudo-thickened gut). This was shown to be a form of mirror image artifact. CONCLUSION: Classification of the effects of gas on US images according totheir physical characteristics may aid in their interpretation. Appreciating two previously undescribed artifacts, pseudo-pneumatosis intestinalis and pseudo-thickened gut, will improve the usefulness of abdominal US.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 12/07/20 alle ore 03:03:37