Study of elastic nonlinearity of soft solids with transient elastography: Landau coefficients and finite amplitude shear wave

2002 ◽  
Vol 112 (5) ◽  
pp. 2404-2405
Author(s):  
Stefan Catheline ◽  
Jean‐Luc Gennisson ◽  
Sana Chaffa ◽  
Mathias Fink
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Finite Amplitude ◽  
Soft Solids ◽  
Elastic Nonlinearity

Liver Elastography in Healthy Children Using Three Different Systems – How Many Measurements Are Necessary?

2020 ◽  
Author(s):  
Anders Batman Mjelle ◽  
Anesa Mulabecirovic ◽  
Roald Flesland Havre ◽  
Edda Jonina Olafsdottir ◽  
Odd Helge Gilja ◽  
...  
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Intraclass Correlation ◽  
Age Groups ◽  
Liver Stiffness ◽  
Shear Wave Elastography ◽  
Healthy Children ◽  
Significant Difference ◽  
Pediatric Liver Disease ◽  
Liver Elastography

Abstract Purpose Liver elastography is increasingly being applied in screening for and follow-up of pediatric liver disease, and has been shown to correlate well with fibrosis staging through liver biopsy. Because time is of the essence when examining children, we wanted to evaluate if a reliable result can be achieved with fewer acquisitions. Materials and Methods 243 healthy children aged 4–17 years were examined after three hours of fasting. Participants were divided into four age groups: 4–7 years; 8–11 years; 12–14 years and 15–17 years. Both two-dimensional shear wave elastography (2D-SWE; GE Logiq E9) and point shear wave elastography (pSWE; Samsung RS80A with Prestige) were performed in all participants, while transient elastography (TE, Fibroscan) was performed in a subset of 87 children aged 8–17 years. Median liver stiffness measurement (LSM) values of 3, 4, 5, 6, 7, and 8 acquisitions were compared with the median value of 10 acquisitions (reference standard). Comparison was performed for all participants together as well as within every specific age group. We investigated both the intraclass correlation coefficient (ICC) with absolute agreement and all outliers more than 10 %, 20 % or ≥ 0.5 or 1.0 kPa from the median of 10 acquisitions. Results For all three systems there was no significant difference between three and ten acquisitions, with ICCs ≥ 0.97. All systems needed 4 acquisitions to achieve no LSM deviating ≥ 1.0 kPa of a median of ten. To achieve no LSM deviating ≥ 20 % of a median of ten acquisitions, pSWE and TE needed 4 acquisitions, while 2D-SWE required 6 acquisitions. Conclusion Our results contradict recommendations of 10 acquisitions for pSWE and TE and only 3 for 2D-SWE.

Non-invasive methods in the assessment of portal hypertension severity

2021 ◽  
Vol 75 (2) ◽  
pp. 125-133
Author(s):  
Soňa Franková ◽  
Jan Šperl
Keyword(s):  
Portal Hypertension ◽  
Liver Fibrosis ◽  
Shear Wave ◽  
Transient Elastography ◽  
Venous Pressure ◽  
Liver Stiffness ◽  
Invasive Technique ◽  
Hepatic Veins ◽  
Oesophageal Varices ◽  
Non Invasive

Portal hypertension represents a wide spectrum of complications of chronic liver diseases and may present by ascites, oesophageal varices, splenomegaly, hypersplenism, hepatorenal and hepatopulmonary syndrome or portopulmonary hypertension. Portal hypertension and its severity predicts the patient‘s prognosis: as an invasive technique, the portosystemic gradient (HPVG – hepatic venous pressure gradient) measurement by hepatic veins catheterisation has remained the gold standard of its assessment. A reliable, non-invasive method to assess the severity of portal hypertension is of paramount importance; the patients with clinically significant portal hypertension have a high risk of variceal bleeding and higher mortality. Recently, non-invasive methods enabling the assessment of liver stiffness have been introduced into clinical practice in hepatology. Not only may these methods substitute for liver biopsy, but they may also be used to assess the degree of liver fibrosis and predict the severity of portal hypertension. Nowadays, we can use the quantitative elastography (transient elastography, point shear-wave elastrography, 2D-shear-wave elastography) or magnetic resonance imaging. We may also assess the severity of portal hypertension based on the non-invasive markers of liver fibrosis (i.e. ELF test) or estimate clinically signifi cant portal hypertension using composite scores (LSPS – liver spleen stiff ness score), based on liver stiffness value, spleen diameter and platelet count. Spleen stiffness measurement is a new method that needs further prospective studies. The review describes current possibilities of the non-invasive assessment of portal hypertension and its severity.

Feasibility of transient elastography versus real-time two-dimensional shear wave elastography in difficult-to-scan patients

2016 ◽  
Vol 51 (11) ◽  
pp. 1354-1359 ◽  
Author(s):  
Benjamin Staugaard ◽  
Peer Brehm Christensen ◽  
Belinda Mössner ◽  
Janne Fuglsang Hansen ◽  
Bjørn Stæhr Madsen ◽  
...  
Keyword(s):  
Real Time ◽  
Shear Wave ◽  
Transient Elastography ◽  
Shear Wave Elastography ◽  
Two Dimensional

scholarly journals Shear-wave generation from cavitation in soft solids

2019 ◽  
Vol 114 (12) ◽  
pp. 123702 ◽  
Author(s):  
J. Rapet ◽  
Y. Tagawa ◽  
C. D. Ohl
Keyword(s):  
Shear Wave ◽  
Wave Generation ◽  
Soft Solids

SAT-322-Comparison of point shear wave elastography (ElastPQ-pSWE) and FibroScan Transient Elastography (F-TE) for liver fibrosis staging in patients with NAFLD

2019 ◽  
Vol 70 (1) ◽  
pp. e781-e782
Author(s):  
Davide Roccarina ◽  
Laura Iogna Prat ◽  
Marta Guerrero ◽  
Elena Buzzetti ◽  
Francesca Saffioti ◽  
...  
Keyword(s):  
Liver Fibrosis ◽  
Shear Wave ◽  
Transient Elastography ◽  
Shear Wave Elastography ◽  
Fibrosis Staging

Comparison of liver stiffness assessment by transient elastography and shear wave elastography using six ultrasound devices

2019 ◽  
Vol 49 (6) ◽  
pp. 676-686 ◽  
Author(s):  
Hiroko Iijima ◽  
Toshifumi Tada ◽  
Takashi Kumada ◽  
Natsuko Kobayashi ◽  
Masahiro Yoshida ◽  
...  
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Liver Stiffness ◽  
Shear Wave Elastography

scholarly journals High risk of misinterpreting liver and spleen stiffness using 2D shear-wave and transient elastography after a moderate or high calorie meal

PLoS ONE ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. e0173992 ◽  
Author(s):  
Maria Kjærgaard ◽  
Maja Thiele ◽  
Christian Jansen ◽  
Bjørn Stæhr Madsen ◽  
Jan Görtzen ◽  
...  
Keyword(s):  
High Risk ◽  
Shear Wave ◽  
Transient Elastography ◽  
Spleen Stiffness ◽  
High Calorie

scholarly journals Concordance of transient elastography and shear wave elastography for measurement of liver stiffness

Sonography ◽  
2017 ◽  
Vol 4 (4) ◽  
pp. 141-145 ◽  
Author(s):  
Sandra O'Hara ◽  
Susan Hodson ◽  
Chandelle Hernaman ◽  
Nick Wambeek ◽  
John Olynyk
Keyword(s):  
Shear Wave ◽  
Transient Elastography ◽  
Liver Stiffness ◽  
Shear Wave Elastography
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