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Keywords:
Liver, Ultrasound, Comparative studies, Education and training
Authors:
A. Popescu, O. Gradinaru Tascau, I. Sporea, R. Sirli, M. Danila, M. Popescu, T. V. Moga, F. B. Bende, S. Bota; Timisoara/RO
DOI:
10.1594/ecr2015/C-2156
Methods and materials
Three operators with different experience in ultrasound and liver elastography,
performed sessions of four consecutive elastographic measurements in four masses,
using 2D-SWE (AixplorerTM ultrasound system, SuperSonic Imagine S.A.,
Aix-en-Provence,
France) and ARFI (Siemens Acuson S2000 TM ultrasound system, Siemens AG,
Erlangen,
Germany) on a phantom model,
which contains targets of known stiffness (Multi-purpose,
Multi-Tissue Ultrasound Phantom Model 049A GSE,
CIRS,
USA).
The elastography ultrasound phantom contains 8 masses with varying B-mode ultrasound and viscoelastic properties (lesions with varying Young’s Modulus levels),
4 (the larger ones) being used in this study.
These masses appear as hyperechoic,
hypoechoic,
and isoehoic in addition to being stiffer,
softer,
or with similar hardness relative to surrounding tissue.
2D-SWE measurements were defined as the median value of 3 measurements expressed in kilopascals (kPa),
obtained in a homogenous color-coded box placed inside the masses with different known stiffness.
For ARFI reliable elastographic measurements were defined as the median value of 10 LS measurements with a success rate≥60% and an interquartile range<30%.
Fig 1-3