scholarly journals A Diagnostic Imaging Method – Shear Wave Elastography

2018 ◽  
Vol 1 (1) ◽  
pp. 14-22
Author(s):  
Marketa Zemanova
Keyword(s):  
Diagnostic Imaging ◽  
Shear Wave ◽  
Elastic Properties ◽  
Soft Tissues ◽  
Shear Wave Elastography ◽  
Biological Tissues ◽  
Utilization Rate ◽  
Quantitative Aspect ◽  
Imaging Method ◽  
Endocrine Orbitopathy

Shear Wave Elastography (SWE) is a non-invasive diagnostic imaging technique, that maps the elastic properties of tissues. Nowadays this modality develops increasingly in medicine across its disciplines and opens a new era of high-quality ultrasound examination because it increases the specificity and thus improves diagnostic assurance. This method is similar to manual palpation, shows elastic properties of biological tissues and provides a kind of reconstruction of the internal structure of soft tissues based on measurement of the response of tissue compression. Results: This method is already used routinely in the detection and diagnosis of breast cancer and thyroid cancer, prostate cancer, in hepatology, cardiology, view of the carotid arteries and lymphatic nodules. Standards of elasticity values for human tissues such as the mammary gland, liver, prostate or thyroid gland are progressively being created across the medical fields. Finally, the article examines its unquestioned benefit in ophthalmology. In ophthalmology, it already appears as an up-and-coming method in diagnostics and in evaluating the changes in oculomotor muscles and orbital tissues in patients with endocrine orbitopathy. Conclusion: Shear wave elastography offers three main innovations: the quantitative aspect, dimensional resolution, and real-time imaging ability. Determination of the utilization rate of this method and its inclusion into the diagnostics of endocrine orbitopathy is still a question and the subject of presently conducted clinical studies.

scholarly journals Viscoelasticity Imaging of Biological Tissues and Single Cells Using Shear Wave Propagation

2021 ◽  
Vol 9 ◽  
Author(s):  
Hongliang Li ◽  
Guillaume Flé ◽  
Manish Bhatt ◽  
Zhen Qu ◽  
Sajad Ghazavi ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Shear Wave ◽  
Soft Tissues ◽  
Acoustic Radiation ◽  
Single Cells ◽  
Shear Waves ◽  
Mechanical Vibration ◽  
Shear Wave Elastography ◽  
Biomechanical Properties ◽  
Biological Tissues

Changes in biomechanical properties of biological soft tissues are often associated with physiological dysfunctions. Since biological soft tissues are hydrated, viscoelasticity is likely suitable to represent its solid-like behavior using elasticity and fluid-like behavior using viscosity. Shear wave elastography is a non-invasive imaging technology invented for clinical applications that has shown promise to characterize various tissue viscoelasticity. It is based on measuring and analyzing velocities and attenuations of propagated shear waves. In this review, principles and technical developments of shear wave elastography for viscoelasticity characterization from organ to cellular levels are presented, and different imaging modalities used to track shear wave propagation are described. At a macroscopic scale, techniques for inducing shear waves using an external mechanical vibration, an acoustic radiation pressure or a Lorentz force are reviewed along with imaging approaches proposed to track shear wave propagation, namely ultrasound, magnetic resonance, optical, and photoacoustic means. Then, approaches for theoretical modeling and tracking of shear waves are detailed. Following it, some examples of applications to characterize the viscoelasticity of various organs are given. At a microscopic scale, a novel cellular shear wave elastography method using an external vibration and optical microscopy is illustrated. Finally, current limitations and future directions in shear wave elastography are presented.

scholarly journals Achilles and patellar tendinopathy display opposite changes in elastic properties: A shear wave elastography study

2017 ◽  
Vol 28 (3) ◽  
pp. 1201-1208 ◽  
Author(s):  
B. K. Coombes ◽  
K. Tucker ◽  
B. Vicenzino ◽  
V. Vuvan ◽  
R. Mellor ◽  
...  
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Shear Wave Elastography ◽  
Patellar Tendinopathy

scholarly journals Intra- and inter-observer variation and accuracy using different shear wave elastography methods to assess circumscribed objects – a phantom study.

2017 ◽  
Vol 19 (4) ◽  
pp. 357 ◽  
Author(s):  
Gregor Seliger ◽  
Katharina Chaoui ◽  
Christian Kunze ◽  
Yasmina Dridi ◽  
Klaus-Vitold Jenderka ◽  
...  
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Measurement Techniques ◽  
Intraclass Correlation ◽  
Shear Wave Elastography ◽  
Observer Variation ◽  
Significant Difference ◽  
Clinical Interest ◽  
Observational Errors

Aims: The elastic properties of circumscribed tissues (e.g., tendons, lymph nodes, prostates, brain tumors) are of considerable clinical interest. The purpose of this study was thus to compare the Intra-/Inter-observer variation and accuracy in vitro of point shear wave elastography (pSWE) with that of 2D-SWE and to assess 2D-SWE’s precision with variable ROI (vROI) incircumscribed objects.Material and methods: Round targets (Elasticity QA Phantom Model 049) were examined for varying degrees of stiffness (8, 14, 45, and 80 kPa) and diameters (20/10 mm). Three ultrasound systems and four probes were applied (pSWE: Acuson/S3000 9L4/4C1 and Epiq7 C51, 2D-SWE: Aplio/500 PVT375BT). Three different ROIs were used, namely fixed ROI (fROI) and variable ROI: rectangular-best-fitted ROI, and round-best-fitted ROI. Each measurement was performed twice by four observers.Results: A total of 3,604 measurements were conducted. The intra-observer variation of 2D-SWE measurements indicated better agreement (Intraclass Correlation Coefficient (ICC) = 0.971; 95% CI=[0.945; 0.985]), than for the pSWE measurements (ICC = 0.872; 95% CI=[0.794; 0.92]). With both methods, the shear wave elastography applied showed low inter-observer variation: ICC = 0.980; 95% CI=[0.970; 0.987]. However, a significant difference was observed between fROI (pSWE) and vROI (2D-SWE) on circumscribed objects in terms of accuracy. The lowest degree of observationerror was detected in situations where the ROI was not “best fitted”, but placed within the target of 3mm from the border (target diameter: 20mm; mean relative error = 0.15).Conclusions: When estimating the elastic properties of circumscribed tissues, the different measurement techniques performed by commercial shear wave elastography systems reveal a strong susceptibility for observational errors, depending upon the fixed vs. variable ROI of the pSWE vs. 2D-SWE technique.

scholarly journals Shear wave elastography parameters of normal soft tissues of the neck

2017 ◽  
Vol 161 (3) ◽  
pp. 320-325 ◽  
Author(s):  
Jan Herman ◽  
Zuzana Sedlackova ◽  
Jaromir Vachutka ◽  
Tomas Furst ◽  
Richard Salzman ◽  
...  
Keyword(s):  
Shear Wave ◽  
Soft Tissues ◽  
Shear Wave Elastography

scholarly journals Intra-System Reliability Assessment of 2-Dimensional Shear Wave Elastography

2021 ◽  
Vol 11 (7) ◽  
pp. 2992
Author(s):  
Christopher Edwards ◽  
Erika Cavanagh ◽  
Sailesh Kumar ◽  
Vicki Clifton ◽  
Davide Fontanarosa
Keyword(s):  
Shear Wave ◽  
System Reliability ◽  
Soft Tissues ◽  
Reliability Assessment ◽  
Sampling Technique ◽  
Shear Wave Elastography ◽  
Medical Ultrasound ◽  
Measurement Variability ◽  
Pathological Conditions ◽  
System Variability

The availability of 2-Dimensional Shear Wave Elastography (2D-SWE) technology on modern medical ultrasound systems is becoming increasingly common. The technology is now being used to investigate a range of soft tissues and related pathological conditions. This work investigated the reliability of a single commercial 2D-SWE system using a tissue-mimicking elastography phantom to understand the major causes of intra-system variability. Sources of shear wave velocity (SWV) measurement variability relates to imaging depth, target stiffness, sampling technique and the operator. Higher SWV measurement variability was evident with increasing depth and stiffness of the phantom targets. The influence of the operator was minimal, and variations in sampling technique had little impact on the SWV.

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