Temperature-dependent elastic properties of brain tissues measured with the shear wave elastography method

2017 ◽  
Vol 65 ◽  
pp. 652-656 ◽  
Author(s):  
Yan-Lin Liu ◽  
Guo-Yang Li ◽  
Ping He ◽  
Ze-Qi Mao ◽  
Yanping Cao
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Shear Wave Elastography ◽  
Temperature Dependent ◽  
Brain Tissues

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 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 Transperineal ultrasound shear-wave elastography is a reliable tool for assessment of the elastic properties of the levator ani muscle in women

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bertrand Gachon ◽  
Xavier Fritel ◽  
Fabrice Pierre ◽  
Antoine Nordez
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Valsalva Maneuver ◽  
Intraclass Correlation ◽  
Shear Wave Elastography ◽  
Levator Ani ◽  
Transperineal Ultrasound ◽  
Levator Ani Muscle ◽  
Reliable Tool ◽  
The Mean

AbstractOur main objective was to assess the intraoperator intersession reproducibility of transperineal ultrasound Shear Wave Elastography (SWE) to measure the levator ani muscle (LAM) elastic properties. Secondary objective was to compare reproducibility when considering the mean of three consecutives measurements versus one. In this prospective study involving non-pregnant nulliparous women, two visits were planned, with a measurement of the shear modulus (SM) on the right LAM at rest, during Valsalva maneuver and maximal contraction. Assessments were done with a transperineal approach, using an AIXPLORER device with a linear SL 18–5 (5-18 MHz) probe. For each condition, 3 consecutive measures were performed at each visit. The mean of the three measures, then the first one, were considered for the reproducibility by calculating intraclass correlation coefficient (ICC), and coefficient of variation (CV). Twenty women were included. Reproducibility was excellent when considering the mean of the 3 measures at rest (ICC = 0.90; CV = 15.7%) and Valsalva maneuver (ICC = 0.94; CV = 10.6%), or the first of the three measures at rest (ICC = 0.87; CV = 18.6%) and Valsalva maneuver (ICC = 0.84; CV = 19.9%). Reproducibility was fair for measurement during contraction. Transperineal ultrasound SWE is a reliable tool to investigate LAM elastic properties at rest and during Valsalva maneuver.

scholarly journals Eccentric and Isometric Exercises in Achilles Tendinopathy Evaluated by the VISA-A Score and Shear Wave Elastography

2020 ◽  
Vol 12 (4) ◽  
pp. 373-381 ◽  
Author(s):  
Matthias Gatz ◽  
Marcel Betsch ◽  
Timm Dirrichs ◽  
Simone Schrading ◽  
Markus Tingart ◽  
...  
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Young Modulus ◽  
Shear Wave Elastography ◽  
Achilles Tendinopathy ◽  
Tissue Elasticity ◽  
Level Of Evidence ◽  
Group 2 ◽  
American Orthopaedic ◽  
Group 1

Background: Apart from eccentric exercises (EE), isometric exercises (ISO) might be a treatment option for Achilles tendinopathy. Shear wave elastography (SWE) provides information for diagnosis and for monitoring tissue elasticity, which is altered in symptomatic tendons. Hypothesis: Isometric exercises will have a beneficial effect on patients’ outcome scores. Based on SWE, insertional and midportion tendon parts will differ in their elastic properties according to current symptoms. Study Design: Randomized clinical trial. Level of Evidence: Level 2. Methods: Group 1 (EE; n = 20; 12 males, 8 females; mean age, 52 ± 8.98 years) and group 2 (EE + ISO; n = 22; 15 males, 7 females; mean age, 47 ± 15.11 years) performed exercises for 3 months. Measurement points were before exercises were initiated as well as after 1 and 3 months using the Victorian Institute of Sports Assessment–Achilles (VISA-A) score, American Orthopaedic Foot & Ankle Society score, and SWE (insertion and midportion). Results: Both groups improved significantly, but there were no significant interindividual differences (VISA-A; P = 0.362) between group 1 (n = 15; +15 VISA-A) and group 2 (n = 15; +15 VISA-A). The symptomatic insertion (symptomatic, 136.89 kPa; asymptomatic, 174.68 kPa; P = 0.045) and the symptomatic midportion of the Achilles tendon (symptomatic, 184.40 kPa; asymptomatic, 215.41 kPa; P = 0.039) had significantly lower Young modulus compared with the asymptomatic tendons. The midportion location had significantly higher Young modulus than the insertional part of the tendon ( P = 0.005). Conclusion: Isometric exercises do not have additional benefit when combined with eccentric exercises, as assessed over a 3-month intervention period. SWE is able to distinguish between insertional and midportion tendon parts in a symptomatic and asymptomatic state. Clinical Relevance: The present study shows no additional effect of ISO when added to baseline EE in treating Achilles tendinopathy. Different elastic properties of the insertional and midportion tendon have to be taken into consideration when rating a tendon as pathologic.

scholarly journals Changes of Material Elastic Properties during Healing of Ruptured Achilles Tendons Measured with Shear Wave Elastography: A Pilot Study

2020 ◽  
Vol 21 (10) ◽  
pp. 3427 ◽  
Author(s):  
Borys Frankewycz ◽  
Leopold Henssler ◽  
Johannes Weber ◽  
Natascha Platz Batista da Silva ◽  
Matthias Koch ◽  
...  
Keyword(s):  
Pilot Study ◽  
Shear Wave ◽  
Elastic Properties ◽  
Achilles Tendon Rupture ◽  
Shear Wave Elastography ◽  
Biomechanical Properties ◽  
Time Correlation ◽  
Ultrasound Technique ◽  
One Year ◽  
The Right

Therapy options for ruptured Achilles tendons need to take into account the right balance of timing, amount and intensity of loading to ensure a sufficient biomechanical resilience of the healing tendon on the one hand, and to enable an adequate tensile stimulus on the other hand. However, biomechanical data of human Achilles tendons after rupture during the separate healing stages are unknown. Shear wave elastography is an ultrasound technique that measures material elastic properties non-invasively, and was proven to have a very good correlation to biomechanical studies. Taking advantage of this technology, 12 patients who suffered from an acute Achilles tendon rupture were acquired and monitored through the course of one year after rupture. Nine of these patients were treated non-operatively and were included for the analysis of biomechanical behaviour. A significant increase of material elastic properties was observed within the first six weeks after trauma (up to 80% of baseline value), where it reached a plateau phase. A second significant increase occurred three to six months after injury. This pilot study suggests a time correlation of biomechanical properties with the biological healing phases of tendon tissue. In the reparative phase, a substantial amount of biomechanical resilience is restored already, but the final stage of biomechanical stability is reached in the maturation phase. These findings can potentially be implemented into treatment and aftercare protocols.

Characterization of Passive Elastic Properties of the Human Tibialis Anterior Muscle Using Supersonic Shear Wave Elastography

2013 ◽  
Author(s):  
Terry K. Koo ◽  
Jingyi Guo ◽  
Jeffrey H. Cohen ◽  
Kevin J. Parker
Keyword(s):  
Shear Wave ◽  
Elastic Properties ◽  
Tibialis Anterior ◽  
Ex Vivo ◽  
Tibialis Anterior Muscle ◽  
Shear Wave Elastography ◽  
Indirect Measurement ◽  
Muscle Elasticity ◽  
Passive Muscle

In a companion ex vivo study of chicken muscles [1], we demonstrated that muscle elasticity measured by Supersonic shear wave elastography (SWE) increases linearly with passive tension, and hence, SWE could be an indirect measurement of passive muscle force. Objectives of the present study were: (1) Determine the test-retest reliability of SWE for in vivo measurements of passive muscle elasticity of the tibialis anterior (TA) muscle; (2) Assess the relationship between elasticity and ankle angle of the TA; and (3) Extract physiologically meaningful parameters from the elasticity-angle curves for better quantification of passive elastic properties.

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