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Acoustic radiation force impulse

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https://www.readbyqxmd.com/read/28227118/shear-wave-elastography-using-wigner-ville-distribution-a-simulated-multilayer-media-study
#1
Pooya Sobhe Bidari, Javad Alirezaie, Jahan Tavakkoli, Pooya Sobhe Bidari, Javad Alirezaie, Jahan Tavakkoli, Javad Alirezaie, Jahan Tavakkoli
Shear Wave Elastography (SWE) is a quantitative ultrasound-based imaging modality for distinguishing normal and abnormal tissue types by estimating the local viscoelastic properties of the tissue. These properties have been estimated in many studies by propagating ultrasound shear wave within the tissue and estimating parameters such as speed of wave. Vast majority of the proposed techniques are based on the cross-correlation of consecutive ultrasound images. In this study, we propose a new method of wave detection based on time-frequency (TF) analysis of the ultrasound signal...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222500/conventional-us-combined-with-acoustic-radiation-force-impulse-imaging-arfi-for%C3%A2-prediction-of-triple-negative-breast-cancer-and-the-risk-of-lymphatic-metastasis
#2
Huan Pu, Li-Xia Zhao, Ming-Hua Yao, Guang Xu, Hui Liu, Huixiong Xu, Rong Wu
PURPOSE: To evaluate the combination of conventional ultrasound (US) and acoustic radiation force impulse imaging (ARFI) in predicting triple-negative breast cancer and the likelihood of lymphatic metastasis. MATERIALS AND METHODS: In total 178 women presenting from May 2013 to September 2015 with pathologically proven triple-negative (n = 60) or hormone receptor (HR)-positive/human epidermal growth factor receptor 2 (HER2)-negative breast cancer (n = 118) were reviewed...
February 4, 2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28214021/arfi-elastography-changes-after-direct-acting-antiviral-treatment-in-transplanted-livers-with-relapse-of-hepatitis-c-virus-infection
#3
M Alfageme Zubillaga, T Fontanilla Echeveste, I Pérez González, A Royuela Vicente, A M Duca, R M Ruiz Peralbo, C González Hernando
OBJECTIVE: To evaluate the changes in the values obtained in acoustic radiation force impulse (ARFI) elastography of the liver after antiviral treatment in patients with liver transplants and hepatitis C virus (HVC) infection recurring after transplantation. MATERIAL AND METHODS: We studied 15 patients infected with HVC who had received liver transplants where an HVC infection recurring in the graft within one year after the transplant was treated with direct-acting antivirals...
February 14, 2017: Radiología
https://www.readbyqxmd.com/read/28180200/acoustic-radiation-force-impulse-elastosonography-of-placenta-in-maternal-red-blood-cell-alloimmunization-a-preliminary-and-descriptive-study
#4
Orkun Cetin, Erbil Karaman, Harun Arslan, Ibrahim Akbudak, Recep Yıldızhan, Ali Kolusarı
AIMS: Maternal red blood cell alloimmunization is an important cause of fetal morbidity and mortality in the perinatal period, despite well-organized prophylaxis programs. The objective of the study was to evaluate placental elasticity by using Acoustic Radiation Force Impulse (ARFI) in Rhesus (Rh) alloimmunized pregnant women with hydropic and nonhydropic fetuses and to compare those with healthy pregnant women. MATERIAL AND METHODS: This case-control and descriptive study comprised twenty-eight healthy pregnant women, 14 Rh alloimmunized pregnant women with nonhydropic fetuses, and 16 Rh alloimmunized pregnant women with hydropic fetuses in the third trimester of pregnancy...
January 31, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28180193/acoustic-radiation-force-impulse-arfi-elastography-for-non%C3%A2-invasive-evaluation-of-hepatic-fibrosis-in-chronic-hepatitis-b-and-c-patients-a-systematic-review-and-meta-analysis
#5
Xiangdong Hu, Lanyan Qiu, Dong Liu, Linxue Qian
AIM: The purpose of the study was to assess the effect of Acoustic Radiation Force Impulse (ARFI) elastography in the diagnosis of liver fibrosis in chronic hepatitis B and C patients through Meta-analysis. MATERIAL AND METHODS: Four databases (PubMed, the Cochrane Library, WanFang data, and CNKI) were searched. The key words were: ("ARFI" or "acoustic radiation force impulse") combined with "liver fibrosis" and ("chronic hepatitis" or "HBV HCV"). Heterogeneity (I2) was assessed, and its source was analyzed through meta-regression...
January 31, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28151749/clinical-usefulness-and-performance-of-acoustic-radiation-force-impulse-in-patients-with-chronic-hepatitis-b
#6
Coskun Ozturker, Ergenekon Karagoz, Ali K Sivrioglu, Kemal Kara
AIM: The aim of this study was to evaluate the performance of acoustic radiation force impulse (ARFI) compared with liver biopsy in quantifying fibrosis levels in patients with chronic hepatitis B (CHB). PATIENTS AND METHODS: The study was approved by the institutional review board at our hospital. One hundred CHB patients and 30 healthy controls (130 individuals) were included in the study. ARFI measurements were performed on all of these cases. CHB was diagnosed when serum hepatitis surface antigen was positive for more than 6 months and when persistent or intermittent elevations in alanine aminotransferase and aspartate aminotransferase levels and histopathological changes in liver biopsy were present...
February 1, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28138404/acoustic-radiation-force-impulse-imaging-of-kidneys-a-phantom-study
#7
Szymon Cygan, Magdalena Januszewicz
AIM OF THE STUDY: Since there have been only few works reporting the diagnosis of kidneys using Acoustic Radiation Force Impulse technique and those works do not provide consistent results of shear wave velocity measurements in renal tissue, we have decided to use kidney phantoms with known properties to examine the reliability of the method itself in a controlled setup similar to kidneys examination. MATERIALS AND METHODS: Four gelatin-based phantoms imitating different clinical situations were manufactured - two with thick and two with thin renal cortex, each type at a depth similar to a normal-weight or overweight patient...
December 2016: Journal of Ultrasonography
https://www.readbyqxmd.com/read/28130908/aspartate-transaminase-platelet-ratio-and-fibrosis-4-indices-as-effective-markers-for-monitoring-esophageal-varices-in-hiv-hepatitis-c-virus-co-infected-patients-due-to-contaminated-blood-products-for-hemophilia
#8
Koji Natsuda, Mitsuhisa Takatsuki, Takayuki Tanaka, Akihiko Soyama, Tomohiko Adachi, Shinichiro Ono, Takanobu Hara, Zhassulan Baimakhanov, Hajime Imamura, Satomi Okada, Masaaki Hidaka, Susumu Eguchi
AIM: We examined the feasibility of the aspartate transaminase (AST)-platelet ratio index (APRI) and Fibrosis-4 (FIB4) score, which are well-established markers for liver fibrosis, as indicators for monitoring esophageal varices in patients who were co-infected with HIV and hepatitis C virus (HCV) due to contaminated blood products for hemophilia in Japan. METHODS: Forty-three HIV/HCV co-infected patients were enrolled. All were hemophilic men (median age 41 years; range, 29-66 years)...
January 28, 2017: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/28127192/evolving-strategies-for-liver-fibrosis-staging-non-invasive-assessment
#9
EDITORIAL
Cristina Stasi, Stefano Milani
Transient elastography and the acoustic radiation force impulse techniques may play a pivotal role in the study of liver fibrosis. Some studies have shown that elastography can detect both the progression and regression of fibrosis. Similarly, research results have been analysed and direct and indirect serum markers of hepatic fibrosis have shown high diagnostic accuracy for advanced fibrosis/cirrhosis. The prognosis of different stages of cirrhosis is well established and various staging systems have been proposed, largely based on clinical data...
January 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28118179/two-dimensional-shear-wave-elastography-a-new-method-comparable-to-acoustic-radiation-force-impulse-imaging
#10
Barbara Schellhaas, Deike Strobel, Dane Wildner, Ruediger S Goertz, Markus F Neurath, Lukas Pfeifer
OBJECTIVES: Two-dimensional shear-wave elastography (2D-SWE) is an ultrasound-based technique for the noninvasive assessment of tissue stiffness. In contrast to the well-established point-shear-wave elastography (pSWE) method acoustic radiation force impulse imaging, there is little evidence on the performance and usefulness of 2D-SWE in the assessment of liver stiffness. Thus, the aim of our study was to compare 2D-SWE versus pSWE. MATERIALS AND METHODS: 2D-SWE and pSWE were performed in 20 cirrhotic patients, 20 healthy individuals and an elasticity phantom...
January 21, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28076629/acoustic-radiation-force-impulse-arfi-elastography-compared-with-biopsy-for-evaluating-hepatic-fibrosis-after-liver-transplantation-a-cross-sectional-diagnostic-study
#11
Joel Schmillevitch, Maria Cristina Chammas, Vincenzo Pugliese, Edson Abdala, Adriana Cortez Rizzon, Venâncio Alves, Luiz Augusto Carneiro, Giovanni Cerri
CONTEXT AND OBJECTIVE: Biopsies are used after liver transplantation to evaluate fibrosis. This study aimed to evaluate the elasticity of transplanted livers by means of a non-invasive examination, acoustic radiation force imaging (ARFI) elastography, correlating the results with the histological analysis. DESIGN AND SETTING: Cross-sectional study in a public university hospital. METHODS: All patients consecutively operated between 2002 and 2010 with an indication for biopsy were evaluated by means of elastography...
November 2016: São Paulo Medical Journal, Revista Paulista de Medicina
https://www.readbyqxmd.com/read/28075330/building-an-open-source-simulation-platform-of-acoustic-radiation-force-based-breast-elastography
#12
Yu Wang, Bo Peng, Jingfeng Jiang
Ultrasound-based elastography including strain elastography, acoustic radiation force impulse (ARFI) imaging, point shear wave elastography and supersonic shear imaging (SSI) have been used to differentiate breast tumors among other clinical applications. The objective of this study is to extend a previously published virtual simulation platform built for ultrasound quasi-static breast elastography toward acoustic radiation force-based breast elastography. Consequently, the extended virtual breast elastography simulation platform can be used to validate image pixels with known underlying soft tissue properties (i...
March 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28067683/acoustic-radiation-force-impulse-elastography-comparison-and-combination-with-other-noninvasive-tests-for-the-diagnosis-of-compensated-liver-cirrhosis
#13
Lukas Pfeifer, Werner Adler, Steffen Zopf, Jürgen Siebler, Dane Wildner, Ruediger S Goertz, Barbara Schellhaas, Markus F Neurath, Deike Strobel
BACKGROUND AND AIMS: The aim of this study was to compare acoustic radiation force impulse (ARFI) elastography with other noninvasive tests and to develop a new score for the assessment of liver fibrosis/cirrhosis. MATERIALS AND METHODS: B-mode ultrasound (including high-frequency liver surface evaluation), routine blood tests, ARFI quantification, and mini-laparoscopic liver evaluation were obtained in compensated patients scheduled for mini-laparoscopic biopsy...
January 6, 2017: European Journal of Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/28039538/maternal-liver-elasticity-determined-by-acoustic-radiation-force-impulse-elastosonography-in-intrahepatic-cholestasis-of-pregnancy
#14
Orkun Cetin, Erbil Karaman, Harun Arslan, Ibrahim Akbudak, Recep Yildizhan, Ali Kolusari
PURPOSE: Intrahepatic cholestasis of pregnancy (ICP) is a pregnancy-specific liver disorder characterized by maternal pruritus and impaired liver function. The objective of the study was to evaluate maternal liver elasticity by acoustic radiation force impulse (ARFI) elastosonography in ICP and to compare it with that in healthy pregnant women. METHODS: This descriptive, case-control study consisted of 33 women with healthy pregnancies and 22 women with ICP in the third trimester of gestation...
December 30, 2016: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28017842/measurement-of-spleen-stiffness-with-acoustic-radiation-force-impulse-imaging-predicts-mortality-and-hepatic-decompensation-in-patients-with-liver-cirrhosis
#15
Yoshitaka Takuma, Youichi Morimoto, Hiroyuki Takabatake, Nobuyuki Toshikuni, Junko Tomokuni, Akiko Sahara, Kazuhiro Matsueda, Hiroshi Yamamoto
BACKGROUND & AIMS: Hepatic venous pressure gradient (HVPG) can predict mortality and hepatic decompensation in patients with cirrhosis. Measurement of HVPG requires an invasive procedure; prognostic markers are needed that do not require invasive procedures. We investigated whether measurements of spleen stiffness, made by acoustic radiation force impulse (AFRI) imaging, associated with mortality and decompensation in patients with cirrhosis, compared to liver stiffness and other markers...
December 22, 2016: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/27981277/a-dilemma-at-gray-scale-thyroid-ultrasound-microcalcification-or-not-differentiation-with-acoustic-radiation-force-impulse-imaging-virtual-touch-imaging
#16
Duzgun Yildirim, Cesur Samanci, Fethi Emre Ustabasioglu, Deniz Alis, Bulent Colakoglu, Alev Bakır, Onur Tutar, Ahmet Erdem Kilavuz, Ahmet Kaur
AIMS: To evaluate the capacity of virtual touch imaging (VTI) of the acoustic radiation force impulse (ARFI) techniquein the differential diagnosis of micro-echogenicities in thyroid nodules. MATERIAL AND METHODS: The study comprised 28patients. Gray scale and ARFI displacement maps were used during ultrasound examination.In the same session, fine needleaspiration biopsy (FNAB) samples were obtained from the dominant nodule hav-ing micro-echogenicities. Two radiologists blinded to the FNAB results and clinical data of the patients evaluated these images and rated ARFI echogenicities according to the degree of shining points on the displacement maps and classified them as isohypoechogenic, isohyperechogenic, and obvious hyperechogenic...
December 5, 2016: Medical Ultrasonography
https://www.readbyqxmd.com/read/27981273/the-pursuit-of-normal-reference-values-of-pancreas-stiffness-by-using-acoustic-radiation-force-impulse-arfi-elastography
#17
Razvan Zaro, Monica Lupsor-Platon, Alexandre Cheviet, Radu Badea
AIM: The purpose of this study is to evaluate pancreatic stiffness by ARFI abdominal elastography. In the current literature, there are relatively few studies that have assessed the clinical utility of this technique. MATERIAL AND METHOD: A number of 37 healthy subjects were included. The data were collected in a prospective manner and afterwards included in an observational, analytical and longitudinal study. Subsequently viewing the pancreatic parenchyma in bidimensional mode (2D-US) mode, 10 shear wave velocity (SWV) measurements for each segment: head, body and tail were performed...
December 5, 2016: Medical Ultrasonography
https://www.readbyqxmd.com/read/27957241/recent-advances-in-the-diagnosis-and-treatment-of-primary-biliary-cholangitis
#18
REVIEW
Ying-Qiu Huang
Primary biliary cholangitis (PBC), formerly referred to as primary biliary cirrhosis, is an infrequent progressive intrahepatic cholestatic autoimmune illness that can evolve into hepatic fibrosis, hepatic cirrhosis, hepatic failure, and, in some cases, hepatocellular carcinoma. The disease itself is characterized by T-lymphocyte-mediated chronic non-suppurative destructive cholangitis and elevated serum levels of extremely specific anti-mitochondrial autoantibodies (AMAs). In this article, we will not only review epidemiology, risk factors, natural history, predictive scores, radiologic approaches (e...
November 28, 2016: World Journal of Hepatology
https://www.readbyqxmd.com/read/27935546/shear-wave-elastography-of-the-testes-in%C3%A2-a%C3%A2-healthy-study-collective-differences-in%C3%A2-standard-values-between-arfi-and%C3%A2-vtiq%C3%A2-techniques
#19
J Marcon, M Trottmann, J Rübenthaler, C G Stief, M F Reiser, D A Clevert
INTRODUCTION: Shear wave elastography (SWE) is a recent technique in the assessment of tissue elasticity. Different elastography techniques have been described over the years.Acoustic Radiation Force Impulse Imaging (ARFI) uses mechanical excitation of tissue to create detectable shear waves, a higher shear wave velocity being associated with an increased tissue stiffness.The Virtual Touch Tissue Imaging Quantification (VTIQ) method uses a mechanical push pulse as well, additionally creating a colour-coded map, in which tissue stiffness can be measured within a stored map on the ultrasound device after measurement...
2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27933438/acoustic-radiation-force-impulse-arfi-elastography-in-the-evaluation-of-renal-parenchymal-stiffness-in-patients-with-ureteropelvic-junction-obstruction
#20
Hatice Arioz Habibi, Rumeysa Yasemin Cicek, Sedat Giray Kandemirli, Emel Ure, Ayse Kalyoncu Ucar, Mine Aslan, Salim Caliskan, Ibrahim Adaletli
PURPOSE: To investigate the role of acoustic radiation force impulse (ARFI) elastography in the detection of renal parenchymal damage in kidneys with and without ureteropelvic junction obstruction (UPJO). METHODS: Twenty-five pediatric patients with a diagnosis of UPJO who underwent surgery and 15 pediatric patients with conservatively managed UPJO were prospectively evaluated with ARFI elastography. Sixteen healthy volunteers constituted the control group. Shear wave velocity (SWV) measurements in the upper, mid, and lower poles of the affected kidney were performed...
December 8, 2016: Journal of Medical Ultrasonics
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