Journal of Korean Society of Medical Ultrasound 1996;15(2): 155-162.
Sonographic Evaluation of Posterior Acoustic Enhancement & Edge Shadowing of Artificial Mass in LiverTissue-Equivalent Material : Experimental Study
Sang Hoo Cha, Cheol Min Park, Kyoo Byung Chung, Won Hyuck Suh
Department of Diagnostic Radiology, Korea University College of Medicine
ABSTRACT
PURPOSE : To analyze the mechanism of posterior acoustic enhancement (PAE) and edge shadowing (ES) of mass onsonography. MATERIAL & METHODS : We produced varied mass in liver tissue-equivalent material (LTEM) showed PAE andES on sonography using agar, distilled water, n-propyl alcohol (determines acoustic velocity[AV]) and powderedgraphite (determines acoustic attenuation[AA]). Then we observed PAE and ES of mass. RESULTS : As AA of mass waslower than that of LTEM, more intense PAE and ES were seen. As AV of AM was lower than that of LTEM, more distinctES were seen. We could observe PAE and ES if only AA of mass was lower than that of LTEM even though AV of massand LTEM were same, but we could not observe PAE and ES if only AV of mass was lower than that of LTEM. ES wasmore distinct in round or oval mass than serrated or lobulated one. PAE and ES were more intense in 3 cm sizedmass than 1 cm sized one. CONCLUSION : Lower AA of mass than that of LTEM is essential to see PAE and ES of masson sonography and AV, shape, and size of mass partly affect PAE and / or ES.
Keywords: Ultrasound, Phantoms, Acoustic enhancement, Edge shadowing, Acoustic attenuation, Acoustic velocity
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