Accuracy of Tissue Elasticity Measurement using Shear Wave Ultrasound Elastography: A Comparative Phantom Study

2015 ◽  
pp. 252-255 ◽  
Author(s):  
C. E. Ting ◽  
C. H. Yeong ◽  
K. H. Ng ◽  
B. J. J. Abdullah ◽  
H. E. Ting
Keyword(s):  
Shear Wave ◽  
Phantom Study ◽  
Ultrasound Elastography ◽  
Tissue Elasticity ◽  
Elasticity Measurement

Comparison of shear wave velocities on ultrasound elastography between different machines, transducers, and acquisition depths: a phantom study

2016 ◽  
Vol 26 (10) ◽  
pp. 3361-3367 ◽  
Author(s):  
Hyun Joo Shin ◽  
Myung-Joon Kim ◽  
Ha Yan Kim ◽  
Yun Ho Roh ◽  
Mi-Jung Lee
Keyword(s):  
Shear Wave ◽  
Phantom Study ◽  
Ultrasound Elastography ◽  
Wave Velocities ◽  
Shear Wave Velocities

Quantitative Assessment of Normal Soft-Tissue Elasticity Using Shear-Wave Ultrasound Elastography

2011 ◽  
Vol 197 (3) ◽  
pp. 532-536 ◽  
Author(s):  
Kemal Arda ◽  
Nazan Ciledag ◽  
Elif Aktas ◽  
Bilgin Kadri Arıbas ◽  
Kenan Köse
Keyword(s):  
Soft Tissue ◽  
Shear Wave ◽  
Quantitative Assessment ◽  
Ultrasound Elastography ◽  
Tissue Elasticity

scholarly journals Sources of Variability in Shear Wave Speed and Dispersion Quantification with Ultrasound Elastography: A Phantom Study

2021 ◽  
Author(s):  
Naiara Korta Martiartu ◽  
Sherin Nambiar ◽  
Iara Nascimento Kirchner ◽  
Catherine Paverd ◽  
Davide Cester ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Speed ◽  
Phantom Study ◽  
Ultrasound Elastography ◽  
Shear Wave Speed

Elasticity Characterization of Liver Cancers Using Shear Wave Ultrasound Elastography: Comparison Between Hepatocellular Carcinoma and Liver Metastasis

2017 ◽  
Vol 33 (6) ◽  
pp. 481-488 ◽  
Author(s):  
Kah Lai Choong ◽  
Yin How Wong ◽  
Chai Hong Yeong ◽  
Gnana Kumar Gnanasuntharam ◽  
Khean Lee Goh ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Liver Metastasis ◽  
Shear Wave ◽  
Liver Tissue ◽  
Normal Liver ◽  
Ultrasound Elastography ◽  
Normal Liver Tissue ◽  
Tissue Elasticity ◽  
Liver Cancers

Purpose: This was a feasibility study of shear wave ultrasound elastography for characterization of liver tumors and to compare the tissue elasticity values of hepatocellular carcinoma (HCC), liver metastases, and normal liver tissues. Methods: Forty-one patients and 30 healthy volunteers were recruited and categorized into HCC, liver metastasis, and control groups based on their computed tomography and sonographic examinations. Elasticity values of different groups were compared statistically. Results: Mean (standard deviation) elasticity values for HCC, liver metastasis, and normal liver tissue were 51.45 (14.96), 49.89 (13.82), and 6.63 (1.65) kilopascal, respectively. Statistically significant differences were found between the elasticity values of HCC and liver metastasis with normal liver tissue. Based on the receiver operating characteristics analysis, 18.25 kilopascal may differentiate the malignant focal liver lesions from the normal liver tissue with both sensitivity and specificity of 100%. Conclusion: Shear wave ultrasound elastography may be able to differentiate HCC and liver metastasis from normal liver tissue based on the tissue elasticity values.

Ultrasound Elastography for Rapid, Real-time Detection of Localized Muscular Reaction in Malignant Hyperthermia–susceptible Pigs

2018 ◽  
Vol 129 (5) ◽  
pp. 989-999
Author(s):  
Stephan Johannsen ◽  
Ismail Türkmeneli ◽  
Susanne Isbary ◽  
Norbert Roewer ◽  
Frank Schuster
Keyword(s):  
Malignant Hyperthermia ◽  
Real Time ◽  
Shear Wave ◽  
Intramuscular Injection ◽  
Shear Wave Elastography ◽  
Ultrasound Elastography ◽  
Temporary Increase ◽  
Maximum Effect ◽  
Tissue Elasticity ◽  
Real Time Detection

Abstract Editor’s Perspective What We Already Know about This Topic What This Article Tells Us That Is New Background Halothane and caffeine induce excessive sarcoplasmic calcium liberation and skeletal muscle contracture in patients susceptible to malignant hyperthermia (MH) and are utilized for diagnosis in the in vitro contracture test. Intramuscular injection previously caused a marked local lactate increase in MH-susceptible but not in MH-nonsusceptible individuals in vivo. Using shear-wave elastography, this study evaluated localized changes in muscle stiffness after intramuscular injection of halothane and caffeine. Methods Microdialysis probes were placed into the gracilis muscle of 16 pigs (9 MH-susceptible and 7 MH-nonsusceptible). After local injection of either halothane or caffeine in different concentrations, changes of tissue elasticity surrounding the probe were examined by quantitative shear-wave elastography. Local lactate concentrations were analyzed spectrophotometrically. Results Ultrasound elastography detected a temporary increase in local muscle rigidity in MH-susceptible but not in MH-nonsusceptible pigs after 2.5 and 5 vol% halothane and after 10, 40, and 80 mM caffeine, whereas there were no differences in the control groups (median [interquartile range] for maximum effect after 5 vol% halothane: MH-susceptible: 97 [31 to 148] vs. MH-nonsusceptible: 5 [−6 to 18] kPa; P = 0.0006; maximum effect after 80 mM caffeine: 112 [64 to 174] vs. −3 [−6 to 35] kPa; P = 0.0002). These effects were seen rapidly within 5 min. Local lactate concentrations were higher in MH-susceptible versus nonsusceptible pigs after 1 and 2.5 vol% halothane and 10, 40, and 80 mM caffeine (2.5 vol% halothane: MH-susceptible: 2.8 [1.9 to 4.4] vs. MH-nonsusceptible: 0.6 [0.6 to 0.7] mmol/l; P < 0.0001; 80 mM caffeine: 5.2 [4.1 to 6.3] vs. 1.6 [1.2 to 2.4] mmol/l; P < 0.0001). After 10 vol% halothane, rigidity and lactate levels were increased in both MH-susceptible and MH-nonsusceptible animals. Conclusions This pilot study revealed shear-wave elastography as a suitable technique for real-time detection of altered tissue elasticity in response to pharmacologic stimulation. By considering the variability of these results, further test protocol optimization is required before elastography could serve as a minimally invasive MH diagnostic test.

scholarly journals Anterior deltoid muscle tension quantified with shear wave ultrasound elastography correlates with pain level after reverse shoulder arthroplasty

2021 ◽  
Author(s):  
Jonas Schmalzl ◽  
Annabel Fenwick ◽  
Thomas Reichel ◽  
Benedikt Schmitz ◽  
Martin Jordan ◽  
...  
Keyword(s):  
Shear Wave ◽  
Shoulder Arthroplasty ◽  
Reverse Shoulder Arthroplasty ◽  
Muscle Tension ◽  
Deltoid Muscle ◽  
Ultrasound Elastography ◽  
Pain Level ◽  
Tissue Elasticity ◽  
Wide Range ◽  
Anterior Deltoid

Abstract Introduction Reverse shoulder arthroplasty (RSA) leads to medialization and distalization of the centre of rotation of the shoulder joint resulting in lengthening of the deltoid muscle. Shear wave ultrasound elastography (SWE) is a reliable method for quantifying tissue stiffness. The purpose of this study was to analyse if deltoid muscle tension after RSA correlates with the patients’ pain level. We hypothesized that higher deltoid muscle tension would be associated with increased pain. Material and methods Eighteen patients treated with RSA were included. Constant score (CS) and pain level on the visual analogue scale (VAS) were analysed and SWE was performed on both shoulders. All three regions of the deltoid muscle were examined in resting position and under standardized isometric loading. Results Average patient age was 76 (range 64–84) years and average follow-up was 15 months (range 4–48). The average CS was 66 points (range 35–89) and the average pain level on the VAS was 1.8 (range 0.5–4.7). SWE revealed statistically significant higher muscle tension in the anterior and middle deltoid muscle region in patients after RSA compared to the contralateral non-operated side. There was a statistically significant correlation between pain level and anterior deltoid muscle tension. Conclusion SWE revealed increased tension in the anterior and middle portion of the deltoid muscle after RSA in a clinical setting. Increased tension of the anterior deltoid muscle portion significantly correlated with an increased pain level. SWE is a powerful, cost-effective, quick, dynamic, non-invasive, and radiation-free imaging technique to evaluate tissue elasticity in the shoulder with a wide range of applications. Level of evidence Diagnostic study, Level III.

scholarly journals Ultrasonic Elastography in the Differential Diagnosis of Thyroid Nodular Patholog

2019 ◽  
Vol 26 (4) ◽  
pp. 45-55
Author(s):  
L. A. Timofeeva ◽  
M. G. Tukhbatullin ◽  
A. N. Sencha
Keyword(s):  
Differential Diagnosis ◽  
Thyroid Cancer ◽  
Shear Wave ◽  
Density Ratio ◽  
Shear Wave Elastography ◽  
Strain Ratio ◽  
Ultrasound Elastography ◽  
Control Group ◽  
Tissue Elasticity ◽  
Patient Groups

Aim.In this study, we set out to determine the informative value of multi-parametric ultrasound examination using ultrasound elastography in the differential diagnosis of thyroid nodular neoplasms.Materialsand methods. We analysed 229 multi-parametric ultrasound examinations of patients in the preoperative period in order to assess the effectiveness of strain elastography (SE) and shear wave elastography (SWE) drawing on the example of ARFI and Strain Ratio. Two patient groups were formed. The fi rst group (N1=93) included patients with thyroid cancer, whereas the second one (N2=136) was composed of patients with benign thyroid nodules (thyroid adenoma and follicular or colloid goitre). The control group consisted of 174 patients with unchanged thyroid parenchyma. SE visualised tissue elasticity as a colour map. Shear wave elastography (SWE) — ARFI and Strain Ratio techniques — was performed using the following ultrasonic apparatuses: Acuson S-2000 (Siemens, Germany), Ultrasonix SP (Sonix, Canada) and Mindray DC-8 (Mindray, China).Results.According to the obtained data (SE technique), the parenchyma of the unchanged thyroid gland exhibited heterogeneous, uneven fi ne / moderately granular, symmetrical staining (96.6%). Thyroid cancer was characterised by a shear wave velocity (ARFI) of greater than 3.57 m/s, as well as a density ratio (elasticity modulus and Strain Ratio) of more than 1.56.Conclusion.The study revealed that the application of ultrasound elastography is highly informative in the comprehensive diagnosis of thyroid nodular neoplasms and should be used when thyroid cancer is suspected to ascertain the size of nodules, as well as the tumour invasion into surrounding tissues.

Diagnostic Value of Real-Time Shear Wave Elastography in Diagnosing Thyroid Cancer

2018 ◽  
Vol 68 (12) ◽  
pp. 2818-2822
Author(s):  
Maria Cristina Oprea ◽  
Mihaela Vlad ◽  
Ioana Golu ◽  
Ioan Sporea ◽  
Lazar Fulger
Keyword(s):  
Shear Wave ◽  
Predictive Value ◽  
Thyroid Nodules ◽  
Imaging Techniques ◽  
Area Under The Curve ◽  
Thyroid Volume ◽  
Shear Wave Elastography ◽  
Maximum Diameter ◽  
Diagnostic Tools ◽  
Tissue Elasticity

Thyroid nodules are a common pathology found in 50 to 60% of otherwise healthy people. Diagnostic imaging techniques are help discriminating between benign and malignant nodules, while fine needle aspiration is still a gold standard. Shear wave elastography, a recent imaging technique, holds the promise to become reliable diagnostic tools and is currently used in combination with ultrasound. We here report data obtained in a series of 52 thyroid nodules analysed by means of elastography, as well as conventional and Doppler ultrasound. We found no differences in age, nodule and thyroid volume, length, width, thickness and maximum diameter between benign and malignant lesions. Several sonographic patterns are considered to be predictive of malignancy, out of which we only found the intranodular blood flow to be statistically significant. By the means of shear wave elastography we have first assessed tissue elasticities, which are shown in a range of colours, depending on tissue elasticity/stiffness. Then, we have measured and recorded four parameters automatically displayed by the system, namely SWE-mean, SWE-max, SWE-SD and SWE-ratio. Data analysis showed all these quantitative parameters had good sensitivity, specificity, positive predictive value, negative predictive value and area under the curve, as calculated by the ROC curve. As with these parameters, the cut-off points were lower than in literature, still able to indicate reliable diagnoses, which were confirmed by histopathological exam. Our conclusion is that shear wave elastography has great potential for reliably and accurately diagnosing thyroid malignancies.

Evaluation of Ovaries in Patients with Polycystic Ovary Syndrome using Shear Wave Elastography

2020 ◽  
Vol 16 (5) ◽  
pp. 578-583
Author(s):  
Aysegul Altunkeser ◽  
Zeynep Ozturk Inal ◽  
Nahide Baran
Keyword(s):  
Shear Wave ◽  
Large Scale ◽  
Polycystic Ovary ◽  
Shear Wave Elastography ◽  
Left Ovary ◽  
Control Group ◽  
Tissue Elasticity ◽  
Group I ◽  
Pcos Group ◽  
The Right

Background: Shear wave electrography (SWE) is a novel non-invasive imaging technique which demonstrate tissue elasticity. Recent research evaluating the elasticity properties of normal and pathological tissues emphasize the diagnostic importance of this technique. Aims: Polycystic ovarian syndrome (PCOS), which is characterized by menstrual irregularity, hyperandrogenism, and polycystic overgrowth, may cause infertility. The aim of this study was to evaluate the elasticity of ovaries in patients with PCOS using SWE. Methods: 66 patients diagnosed with PCOS according to the Rotterdam criteria (PCOS = group I) and 72 patients with non-PCOS (Control = group II), were included in the study. Demographic and clinical characteristics of the participants were recorded. Ovarian elasticity was assessed in all patients with SWE, and speed values were obtained from the ovaries. The elasticity of the ovaries was compared between the two groups. Results: While there were statistically significant differences between the groups in body mass index (BMI), right and left ovarian volumes, luteinizing hormone and testosterone levels (p<0.05), no significant differences were found between groups I and II in the velocity (for the right ovary 3.89±1.81 vs. 2.93±0.72, p=0.301; for the left ovary 2.88±0.65 vs. 2.95±0.80, p=0.577) and elastography (for the right ovary 36.62±17.78 vs. 36.79±14.32, p=0.3952; for the left ovary 36.56±14.15 vs. 36.26±15.10, p=0.903) values, respectively. Conclusion: We could not obtain different velocity and elastography values from the ovaries of the patients with PCOS using SWE. Therefore, further large-scale studies are needed to elucidate this issue.

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