In swe, the acoustic force created by a focused ultrasound beam generates shear waves in tissue. Ultrasound point shear wave elastography assessment of liver and spleen stiffness. Shear wave elastography implementation on the logiq e9. The aim of the study was to assess the efficiency of swe in predicting malignancy and to compare swe with us. Transient elastography te is a nonimaging elastographic technique, while point shear wave pswe and 2dswe combine imaging with elastography. We aim to correlate swe of ileal crohns disease in vivo to ceus peak enhancement and pathology grades of inflammation, fibrosis, and muscular hypertrophy. By using inversion algorithms, this method maps the waves into elastograms and determines stiffness of the tissue by measuring the shear modulus value. Technological progress of ultrasound elastography based on. 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. Shear wave measurement swm hitachi healthcare develops and supplies highquality medical imaging equipment. Shear wave elastography is an imaging technique which quantifies liver stiffness, by measuring the speed of sheer waves in the liver tissue.
Shear wave elastography swe is a new technique that estimates tissue stiffness in real time and is quantitative and user independent. Society of radiologists in ultrasound statement barr et al we limited the discussion to diffuse liver disease, as our goal was to determine how elastography could be best used to evaluate patients at risk for liver fibrosis and to manage patients with known fibrosis. Experience of using shear wave elastography imaging in super. Shear wave elastography swe is a recent quantitative technique for assessing the elasticity of soft tissues. Shear wave elastography measurements can be acquired by ultrasound in seconds, compared to minutes with mr. Ges implementation of shear wave elastography on the logiq. Elastography, or ultrasound shear wave elastography swe is an imaging technique that maps the elastic the speed of ultrasound wave transmission through liver. Grgurevic i, bokun t, mustapic s, trkulja v, heinz r, banic m, puljiz z, luksic b, kujundzic m. Shearwave 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.
Elastography uses ultrasound us to assess elasticity. 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. Clinical utilization of shear wave elastography in. We investigated the effectiveness of shear wave elastography swe in patients with lower extremity superficial venous insufficiency vi. Committed to providing proven diagnostic technology which meets the needs of physicians and patients, we invest continually in cuttingedge research. Now, the introduction of shear wave philips elastq imaging provides realtime feedback, greater confidence in quantification, and speed to advance the use of elastography in clinical practice. Shear wave elastography versus strain elastography in. Us elastography strain elastography shear wave elastography qualitative and indirect operatordependent insufficient for diffuse diseases quantitative and direct higher repeatability 2 cs shear modulus density kgm3 shear wave speed ultrasound transducer kpa 0 5 10 15 20 25 7 2014 mfmer slide8 2. Displaying sidebyside strain elastography and elastq imaging 6 both strain and shear wave elastography techniques help to further characterize breast lesions. Ultrasound elastography for biomedical applications and.
Pdf we evaluated variation in fibrosis staging caused by depth, preload force and measurement offaxis distance on different ultrasound. 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. The resulting shear waves are imaged with the same transducer at an ultrafast imaging sequence in order to provide quantitative elasticity maps bercoff j 2004. Ultrafast shear wave elastography this is the technique developed by supersonic imaging also based on transient elastography ultrasound pulse. Bmode ultrasound and shearwave and strain elastography were performed in. 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. Xray elastography by visualizing propagating shear waves.
Many studies have established the high diagnostic accuracy of shear wave elastography swe for the detection of prostate cancer pca. Shear wave elastography swe is a realtime, twodimensional elastography technology that has emerged in recent years. A realtime shortduration acoustic push pulse is used to generate shear waves that propagate perpendicular to the main ultrasound beam. Dynamic elastography can map shear modulus quantitatively from the velocity of the propagating shear wave, which is calculated from not only spatial but also temporal variation in displacement vector. The swvs were measured using an elasticity phantom with a youngs modulus of 16. Summaries for the public from clinical thyroidology from recent articles in clinical thyroidology table of contents pdf file for saving and printing. Accuracy of shear wave elastography for the diagnosis of. Bladder measurements by ultrasound shear wave elastography are in correlation with bladder storage pressure and measurements of shear wave speed differentiate between compliant and noncompliant. The system monitors shear wave propagation and measures its velocity, then displays it in an easytointerpret format. The speed at which the shear wave propagates is proportional to the square root of the tissue elasticity. Apr 30, 2019 to evaluate the prognostic value of ultrasound and shear wave elastography swe in diagnosing malignant cervical lymph nodes. Placental elastography in intrauterine growth restriction. Shear wave elastography in the evaluation of renal.
Contrastenhanced ultrasound ceus uniquely detects bowel wall inflammation. Shear wave elastography radiology reference article. Qelaxto is esaotes innovative approach to point shear wave elastography. Shearwave elastography improves the specificity of breast us. Role of shear wave elastography in characterization of. To evaluate the prognostic value of ultrasound and shearwave elastography swe in diagnosing malignant cervical lymph nodes. A low speed corresponds to a soft liver, while a high speed indicates stiffer tissue. Elasticity patterns of solid breast lesions with transient. The stress can be by compression and subsequent release of the tissue by the transducer, breathing, or heartbeat of. The role of ultrasound and shearwave elastography in. Two primary methods for performing elastography with ultrasound have been devised. To investigate consistency in shear wave velocities swvs on ultrasound elastography using different machines, transducers and acquisition depths. Philips elastography generates shear waves inside the liver by using acoustic force from a focused ultrasound beam. While strain imaging can offer a qualitative assessment of tissue stiffness, techniques using acoustic radiation force impulse arfi such as shear wave point.
While ultrasound elastography has shown promising results for noninvasive assessment of liver fibrosis, new applications in breast, thyroid, prostate, kidney and lymph node imaging are emerging. Now, the introduction of shear wave philips elastq imaging provides realtime feedback, greater confidence in quantification, and speed to advance the use of. The shear waves are lateral waves, with a motion perpendicular to the direction. Thyroid nodules shear wave elastography will differentiate benign from cancerous thyroid nodules. Shear wave elastography swe is a new technique based on shear waves that has been implemented in diagnostic ultrasound us systems. Shear wave elastography will differentiate benign from. Elastography measures the deformation of tissues after an external stress is applied.
Shear wave elastography swe is a stateoftheart usg technique, which provides a quantified stiffness map of tissues. An analysis of breast lesion characterization in 83 breast lesions. Jan 26, 2016 to investigate consistency in shear wave velocities swvs on ultrasound elastography using different machines, transducers and acquisition depths. A total of 8 symptomatic patients, 51 asymptomatic volunteers, and a total of 359 lower extremities 257 symptomatic, 102 asymptomatic were examined. Supersonic shear wave elastography swe is a novel technology involving the remote generation of transient mechanical forces into the tissue by a transducer. In contrast to strain elastography, shear wave elastography uses an acoustic radiation force impulse created by a focused ultrasound beam, which allows measurement of the propagation speed of shear waves within the tissue to locally quantify its stiffness in kilopascals or meters per second. The type of elastography that is most suited to the assessment of diffuse liver disease is swe, which measures the speed of a shear wave in the liver. Pdf ultrasound point shear wave elastography assessment of. In terms of accuracy, swe compares well with fibroscan and has been shown to be more reliable in obese patients and those with ascites. 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. Dec 24, 2015 ultrafast shear wave elastography this is the technique developed by supersonic imaging also based on transient elastography ultrasound pulse. Berg wa, cosgrove do, dore cj, schafer fk, svensson we, hooley rj. 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.
May 16, 2017 many studies have established the high diagnostic accuracy of shear wave elastography swe for the detection of prostate cancer pca. Accurate measurements of liver stiffness using shear wave. Materials and methods all patients received a conventional. Introducing nextgeneration shear wave elastography. The use of shear waves, however, requires a more complex system, able to generate the shear wave mechanical vibrator or ultrasound radiation pressure and to image the. Swe shear wave elastography te transient elastography.
In commercially available shear wave elastography systems, compressive acoustic waves are used both to induce and track shear waves. As a branch of ultrasound elastography ue, shear wave elastography is recognized by engineering and clinical fields, particularly fast shear wave elastography swe. Comparison of shearwave and strain ultrasound elastography ajr. 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. Shear wave elastography swe is an emerging ultrasound technique used to measure tissue stiffness. Shear wave elastography in characterization of liver tumours. Shear wave elastography swe in hepatitis c patients comparative table. Shear wave elastography with ultrasound differs from transient elastography initiated by mechanical stimulus, and also by the user compression or physiological motion of strain imaging. Bmode ultrasound and shear wave and strain elastography were performed in 150 breast lesions. Experience of using shear wave elastography imaging in. An swe procedure also allows for a formal ultrasound study of the liver and upper abdomen at the same time. Dynamic elastography techniques, which rely on shear waves propagation, can produce quantitative and higher resolution youngs modulus map compared to quasistatic methods.
As no study has suggested one technique is superior to the other, performing both. The aim of the study was to compare elastographic means in parathyroid adenomas, using shear wave elastography and strain elastography. Open access research diagnostic accuracy of point shear. These factors enable ultrasound shear wave elastography to be used in a variety of different clinical settings. Comparison of strain and shear wave elastography for. Shear wave measurement swm hitachi medical systems. Comparison of strain elastography, shear wave elastography. Apr 18, 2018 we investigated addition of strain and shear wave elastography to conventional ultrasonography for the qualitative and quantitative assessment of breast masses. 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. A total of 99 patients with enlarged lymph nodes 99 lymph nodes presenting as a neck mass were examined clinically with conventional. Shear wave elastography an overview sciencedirect topics. Comparison of strain elastography, point shear wave. Shear wave elastography improves the specificity of breast us. By measuring the speed of the ultrasound in the liver tissue, the underlying stiffness of the liver is quantified.
Ultrasound elastography is an emerging technology that provides information about the inherent elasticity of tissues and has the potential to. A large multicenter breast imaging study has demonstrated both reproducibility and significant improvement in the classification of breast lesions when shear wave elastography images are added to the interpretation of standard bmode and color mode ultrasound images. The aim of this study is to study the role of shear wave elastography in differentiation between benign and malignant hepatic focal lesions. Regularized tracking of shearwave in ultrasound elastography mahmoud derakhshan horeh, amir asif, and hassan rivaz electrical and computer engineering, concordia university, montreal, qc, canada h3g 1m8 perform centre, concordia university, montreal, qc, canada h4b 1r6 abstract ultrasound elastography involves imaging tissue while it undergoes.
Comparison of shearwave and strain ultrasound elastography. Dynamic elastography can map shear modulus quantitatively from the velocity of the propagating shearwave, which is calculated from not only spatial but also temporal variation in displacement vector. There are several different methods for performing elastography on the liver, including transient elastography te, radiation force impulse arfi point shear wave elastography swe and 2. 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.
The purpose of this article is to compare the diagnostic performances of shearwave and strain elastography for the differentiation of benign and malignant breast lesions. Ultrasound shear wave elastography and contrast enhancement. Shear wave ultrasound elastography swe is a method of us imaging based on the detection of shear wave propagation through the tissue. Ultrasound shear wave elastography swe measures bowel wall stiffness. We investigated addition of strain and shear wave elastography to conventional ultrasonography for the qualitative and quantitative assessment of.
The society of radiologists in ultrasound convened a panel of specialists from radiology, hepatology, pathology. Elastography was initially developed by using ultrasound. In contrast to strain elastography, shearwave elastography uses an acoustic radiation force impulse created by a focused ultrasound beam, which allows measurement of the propagation speed of shear waves within the tissue to locally quantify its stiffness in kilopascals or meters per second. Realtime twodimensional shear wave ultrasound elastography of the liver is a reliable predictor of clinical outcomes and the presence of esophageal varices in patients with compensated liver cirrhosis. Shear wave elastography in the diagnosis of hand tumours.
The velocity of shear waves correlates with tissue elasticity. Shear wave velocity is expressed in meters per second or in kilopascals using the young modulus. The first noninvasive measurements of tissue stiffness were made using ultrasound and took advantage of its realtime imaging capabilities and. Hepatic shear wave elastography cvph medical center. Oct 26, 2018 click on the title to browse this book. Philips elastpq, which features ultrasound shear wave point quantification, brought significant advances to elastography.
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