It is user independent, no manual transducer push is required. After this, the sonographer shifted to vtq arfi mode, placed the roi size 5 mm x 5 mm within the lesion to detect shear wave velocity in meters per second m s, repeated until covered the maximum region and recorded the maximal shear wave. This allows selection of a liver parenchymal region of interest devoid of blood vessels or focal lesions for analysis. It uses an acoustic radiation force impulse arfi generated by a focused ultrasound beam and quantifies the shear wave velocity in meters per second and stiffness youngs modulus in kilopascal of tissues. Shearwave elastography for the estimation of liver fibrosis. Diagnostics free fulltext shear wave elastography in. Accuracy of shear wave elastography for the diagnosis of. Shear wave elastography in the diagnosis of hand tumours. Single tracking location shear wave elastography ultrasound. Because the shear wave velocity depends on tissue stiffness, it is possible to shear wave elastography this document was downloaded for personal use only. Apr 18, 2018 shear wave elastography exploits the fact that shear waves propagate faster in hard than in soft tissue. Elasticity imaging is possible for nearly every tissue. Apr 07, 2016 in contrast to strain elastography, shear wave elastography swe uses an acoustic radiation force impulse, which allows measurement of the propagation speed of shear waves within the tissue to locally quantify its stiffness in either kilopascals or meters per second.
Quantitative sonoelastographic assessment of the normal. The secondary objective was to compare the crosssectional areas csa of the ulnar nerve in the cubital tunnel and to determine a cutoff value for this parameter accurately identifying persons. To investigate the optic nerves elastic properties using shear wave and strain elastography in patients with migraine compared to healthy individuals. Influence of probe pressure on ultrasoundbased shear wave. To investigate muscle stiffness in healthy young, middleaged and elderly cohorts using swe and correlate it with muscle strength and mass. Recently, shear wave elastography swe was developed as a new, noninvasive, ultrasound imaging technique that provides both qualitative and quantitative information. A qualitative elastography image was created first. The speed at which the shear wave propagates is proportional to the square root of the tissue elasticity. Point shear waves elastography using arfi technology virtual touch.
Swei is potentially advantageous for high spatial resolution shear wave speed imaging. Reproducibility of natural shear wave elastography measurements. Objectives the goal of our study was to investigate the potential of myocardial shear wave imaging swi to quantify the diastolic myocardial stiffness ms kpa noninvasively in adult healthy volunteers hvs and its physiological variation with age, and in hypertrophic cardiomyopathy hcm populations with heart failure and preserved ejection function hfpef. Shear wave elastography and afirma gene expression. Evaluation of a point shear wave elastography technique for. Performing an elastpq shear wave examination with increasing fibrosis, the liver becomes stiffer, which can be monitored using shear wave elastography. Comparison of shearwave and strain ultrasound elastography.
From supersonic shear wave imaging to fullfield optical. Comparison of sound touch elastography, shear wave elastography and vibrationcontrolled transient elastography in chronic liver disease assessment using liver biopsy as the reference standard. It uses a focused ultrasonic pulse to evaluate realtime elasticity of the soft tissues based on viscoelastic properties 14. Swe was the last part of the us exam prior to fnab. Jan 08, 2017 transient elastography te has been validated in multiple studies but shear wave elastography swe may be preferred because unlike transient elastography, which consists of a vibrator producing shear waves, the latter can perform a conventional ultrasound at the same time.
The first stl swei method developed is called spatially modulated ultrasound radiation force smurf. Shear wave elastography swe of the liver, because of its noninvasive nature, has come to replace liver biopsy for. Shear wave elastography is a developing variation of ultrasound imaging the concept is similar to strain elastography, but instead of using transducer pressure to compare a shift in an ultrasound aline thereby measuring changes in strain, a higher intensity pulse is transmitted to produce shear waves, which extend laterally from the insonated structure. Shear wave elastography versus strain elastography in. Role of shear wave elastography in differentiating benign and. Feasibility of imaging and treatment monitoring of breast lesions with threedimensional shear wave elastography. Correlations between range of motion and elasticity of the. Evaluation of the optic nerve by strain and shear wave. Elastic changes of the coracohumeral ligament evaluated with. In vitro comparison of five different elastography systems for.
Philips elastpq, which features ultrasound shear wave point quantification. Only a small number of studies of shear wave ultrasound elastography have been reported in the. Noninvasive estimation of hvpg by combined structural and hemodynamic evaluation of portal hypertension. As expected, ffoct is found to be much more sensitive than ultrafast ultrasound to tiny shear vibrations a few nanometers and micrometers, respectively. Shear wave elastography using sonographic measurements seems to suggest stiffness of achilles tendon of frequentexercisers was significantly higher than that of infrequent exercisers on the nondominant, but not dominant, ankle. The technique is integrated into an ultrasound system. Elastography for intravascular ultrasound pdf free download. Diagnostic accuracy of point shear wave elastography and. Point shear wave elastography elastpq is a reliable noninvasive. Qelaxto the shear waves are lateral waves, with a motion perpendicular to the direction of the force that has generated them. Shear wave elastography an overview sciencedirect topics. In 18 young men, muscle hardness of the long head of tb was measured at 50%, 60%, and 70% point along the length of the upper arm from the acromial process of the scapula to the lateral epicondyle of the humerus by using shear wave ultrasound elastography. S88 ultrasound in medicine and biology ultrasound in normal, steatosis, fibrosis, and nash rat livers.
By using inversion algorithms, this method maps the waves into elastograms and determines stiffness of the tissue by measuring the shear modulus value 20. Shear wave ultrasound liver assessment philips ultrasound. Stiffness assessed in gel phantoms and an ex vivo rat brain by ffoct is found to be in good agreement with ultrasound shear wave elastography. Shear wave elasticity imaging swei, another form of dynamic elastography, is very similar to arfi because it uses the same excitation pulse to displace the tissue but instead quantifies the speed of the shear wave produced by the excitation. It has the advantages of operator independence, reproducibility, higher spatial resolution, and quantitative evaluation without compression artifacts. Quantitative assessment of normal softtissue elasticity. Pdf shear wave elastography swe is a noninvasive diagnostic imaging technique, that maps the elastic. The assessment of the main mechanical properties of tissues can be made with this technology by characterisation of their response to stress. The aim of the study was to compare elastographic means in parathyroid adenomas, using shear wave elastography and strain elastography. However they allow the generation of multiple shear wave along a same longitudinal axis through a compression wave leading to the propagation of a plane shear wave.
Sound touch elastography a new solution for ultrasound. Ultrasound elastography, shear wave, variation, liver. Reducing the number of measurements in liver point shear wave elastography. Shear wave elastography swe is a recent quantitative technique for assessing the elasticity of soft tissues. Shear wave ultrasound elastography is a new and exciting technology in diagnostic ultrasound. Elastography can be performed with an ultrasonic transducer in combination with shear wave techniques, such as transient elastography te, point shear wave elastography pswe and twodimensional shear wave elastography.
Nov, 2014 shear wave elastography swe uses measurement of acoustically generated tissue shear wave propagation speeds to derive estimates of liver stiffness, with the advantage of simultaneous anatomic bmode us imaging. Shear wave elastography swe may detect these changes by measuring muscle stiffness. Dynamic elastography techniques, which rely on shear waves propagation, can produce quantitative and higher. Elasticity patterns of solid breast lesions with transient. Select ion of ou r books inde xed in the boo k ci tation i ndex. Pdf on jul 23, 2019, alina popescu and others published 2d shear wave elastography for liver fibrosis evaluation find, read and cite all the research you need on researchgate. Pdf 2d shear wave elastography for liver fibrosis evaluation. Flowchart of patient selection, shear wave elastography procedures and analyses. Ultrasound elastography has been proposed for differentiating different degrees of intestinal fibrosis in cd, but this was mostly tested in animal models or ex vivo and human studies are lacking.
The purpose of this article is to compare the diagnostic performances of shear wave and strain elastography for the differentiation of benign and malignant breast lesions. Jan 19, 2016 shear wave elastography has gained more attention in recent years, providing quantitative stiffness measurement by displaying the shear wave propagation speed or the tissue mechanical modulus, such as shear modulus, and youngs modulus, which is most often used to quantify the stiffness. This study evaluates the diagnostic value of twodimensional shear wave elastography 2 dswe technique in the evaluation of hyperplastic parathyroid glands in cases with secondary and tertiary hyperparathyroidism. Shear wave elastography is a technique that was developed to analyze tissue quality, with a focus on elasticity. Methods the migraine group consisted of 30 patients 16 with visual auras and 14 without auras who had previously had a diagnosis of migraine. Pdf download for point shear wave elastography of the spleen in. Us elastography for breast lesion characterization. Journal of biomedical engineering and medical imaging, volume 2, no 3, june 2015, pp 2428. Because it is noninvasive, shear wave elastography can offer a welltolerated and costeffective method for diagnostics. Point shear wave elastography of the spleen in predicting the. This prospective study examined 20 consecutive patients diagnosed with primary hyperparathyroidism and parathyroid adenoma, confirmed by biochemical assay, technetium99 sestamibi scintigraphy, and pathology report, after parathyroid.
Unlike acoustic compressive waves, which spread in the same direction as the particle compression, the propagation of shear waves proceeds orthogonal to the stimulated displacement. Magnetic resonance and ultrasound imaging have been used in a variety of animal and human studies to perform swe measurements. An important advantage of transient elastography compared to harmonic elastography techniques is the separation of shear waves and compression waves. For this study a siemens acuson s3000 us system was used. Shear wave elastography is a promising adjunct to ultrasound for the evaluation of the uterus, and the results from this study may provide normal data, which may further. Twelve morphological and five elasticity parameters were measured from each mn. In shearwave elastography transient an ultrasound shear wave is generated by the transducer instead of manual compression and then the propagation speed in the tissue of this shear wave is measured.
Diagnostic value of twodimensional shear wave elastography in papillary thyroid microcarcinoma. Comparison of strain and shear wave elastography for. Shear wave velocity swv was measured in the quadriceps. Pdf uselastography for breast lesion characterization.
Skeletal muscle undergoes structural changes with ageing which may alter its biomechanical properties. Any information contained in this pdf file is automatically generated from digital. Bmode ultrasound and shear wave and strain elastography were performed in 150 breast lesions. Following the manufacturers manual and our clinical study pro tocol, we selected a rectangular linear probe or trapezoid con vex probe roi on the. Physicians have used palpation to detect differences in tissue stiffness as an aid to diagnosis based on the fact that the mechanical properties of tissues are often dramatically affected by the presence of disease processes such as cancer, inflammation, and fibrosis. Elastography as a noninvasive tool to simplify liver assessment 2 liver shear wave elastography provides stiffness measurements for assessment of diffuse liver disease and possibly neoplastic lesions of the liver. A total of 59 patients endstage renal disease, under supplemental dialysis program with visible parathyroid hyperplastic glands on ultrasound, confirmed by biochemical assay and. Myocardial stiffness evaluation using noninvasive shear. Shear wave elastography is a rapidly evolving us imaging technique that allows quantification of mechanical and elastic tissue properties and serves as an adjunct to conventional us techniques, aid. Muscle hardness of the triceps brachii before and after a. Elastography is a way to visualize, record and report tissue stiffness parameters. Shear wave elastography relies on the generation of shear waves determined by the displacement of tissues induced by the force of a focused ultrasound beam or by an external push. Ultrasound elastography use is a recent technology that has experienced major developments in the past two decades. This noninvasive, reproducible, and easily performed method of assessing liver tissue stiffness may help reduce, or even avoid, the need for conventional liver biopsies.
Reliability and factor effect reliability measurement of liver shear wave elastography variant method. Philips shear wave elastography simplifies liver assessment, making obtaining liver stiffness measurements fast and easy. The aim of this study is to compare the performance of shear wave elastography, morphometry, and ai techniques to predict mn entrapment accurately. A comparative study of shearwave elastography and strain. Shear wave elastography radiology reference article. Pdf shear wave elastography swe is a noninvasive diagnostic imaging technique, that maps the elastic properties of tissues.
Realtime shear wave ultrasound elastography differentiates. Ultrasound shear wave elastography and liver fibrosis. During the elastography exam, patients were asked not to swallow or breathe for a few seconds. Dec 24, 2015 ultrafast shear wave elastography this is the technique developed by supersonic imaging also based on transient elastography ultrasound pulse. Pdf a diagnostic imaging method shear wave elastography. Some systems also provide a bmode image in a dual display. This velocity is proportional to the square root of the tissues elasticity modulus. The effect of ageing on shear wave elastography muscle. Swe is a type of us elastography that uses shear waves to assess tissue elasticity and display it in a quantitative manner. Both strain elastography and shear wave elastography have been shown to have high sensitivity and specificity for characterizing breast lesions as benign or malignant. The technique can be implemented in 1d 19 and 2d which required the development of an ultrafast ultrasound scanner. Methods shear wave elastography was performed on patients with ald with an aixplorer ultrasound system. May 16, 2017 many studies have established the high diagnostic accuracy of shear wave elastography swe for the detection of prostate cancer pca. Shear wave ultrasound elastography swe is a method of us imaging based on the detection of shear wave propagation through the tissue.
Shear wave elastography and strain elastography on a breast phantom for diagnosis of tumor and cyst. Objectives the primary aim of this study was to verify if shear wave elastography swe can be used to diagnose ulnar neuropathy at the elbow une. Comparison of sound touch elastography, shear wave. Influencing factors of 2d shear wave elastography of the muscle. Unlimited viewing of the articlechapter pdf and any associated supplements and figures.