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Acoustic radiation force impulse

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https://www.readbyqxmd.com/read/29330689/the-efficiency-of-acoustic-radiation-force-impulse-arfi-elastography-in-the-diagnosis-and-staging-of-carpal-tunnel-syndrome
#1
Harun Arslan, Alpaslan Yavuz, Ferda İlgen, Abdurrahman Aycan, Mesut Ozgokce, Hüseyin Akdeniz, Abdussamet Batur
OBJECTIVES: The aim of the present study was to quantify the stiffness of the median nerve (MN) at the carpal tunnel inlet by acoustic radiation force impulse (ARFI) elastography and to evaluate whether ARFI can be used in diagnosis and staging of carpal tunnel syndrome (CTS). METHODS: Sonographic examinations of 96 wrists in 50 patients were included in the study. The cross-sectional area and stiffness of the MN were quantitatively measured by B-mode ultrasonography (USG) and ARFI...
January 12, 2018: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29261126/remotely-exploring-deeper-into-matter-by-non-contact-detection-of-audible-transients-excited-by-laser-radiation
#2
Javier Moros, Inmaculada Gaona, J Javier Laserna
An acoustic spectroscopic approach to detect contents within different packaging, with substantially wider applicability than other currently available subsurface spectroscopies, is presented. A frequency-doubled Nd:YAG (neodymium-doped yttrium aluminum garnet) pulsed laser (13 ns pulse length) operated at 1 Hz was used to generate the sound field of a two-component system at a distance of 50 cm. The acoustic emission was captured using a unidirectional microphone and analyzed in the frequency domain. The focused laser pulse hitting the system, with intensity above that necessary to ablate the irradiated surface, transferred an impulsive force which led the structure to vibrate...
December 20, 2017: Sensors
https://www.readbyqxmd.com/read/29259380/clinical-value-of-liver-and-spleen-shear-wave-velocity-in-predicting-the-prognosis-of-patients-with-portal-hypertension
#3
Yan Zhang, Da-Feng Mao, Mei-Wu Zhang, Xiao-Xiang Fan
AIM: To explore the relationship of liver and spleen shear wave velocity in patients with liver cirrhosis combined with portal hypertension, and assess the value of liver and spleen shear wave velocity in predicting the prognosis of patients with portal hypertension. METHODS: All 67 patients with liver cirrhosis diagnosed as portal hypertension by hepatic venous pressure gradient in our hospital from June 2014 to December 2014 were enrolled into this study. The baseline information of these patients was recorded...
December 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29235512/a-multimodal-biomicroscopic-system-based-on-high-frequency-acoustic-radiation-force-impulse-and-multispectral-imaging-techniques-for-tumor-characterization-ex-vivo
#4
Jihun Kim, Anna Seo, Jun-Young Kim, Sung Hyouk Choi, Hyung-Jin Yoon, Eunjoo Kim, Jae Youn Hwang
We report a multimodal biomicroscopic system which offers high-frequency ultrasound B-mode, acoustic radiation force impulse (ARFI), and multispectral imaging for qualitative tumor characterization ex vivo. Examinations of resected tissues from diseased regions such as tumors are crucial procedures during surgical operations to treat cancer. Particularly, if tiny tumors remain at surgical sites after tumor resection, such tumors can result in unwanted outcomes, such as cancer recurrence or metastasis to other organs...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29218616/noninvasive-assessment-of-hepatic-sinusoidal-obstructive-syndrome-using-acoustic-radiation-force-impulse-elastography-imaging-a-proof-of-concept-study-in-rat-models
#5
So Hyun Park, Seung Soo Lee, Ji-Youn Sung, Kiyong Na, Hyoung Jung Kim, So Yeon Kim, Beom Jin Park, Jae Ho Byun
OBJECTIVES: To determine the feasibility of acoustic radiation force impulse (ARFI) elastography in the evaluation of hepatic sinusoidal obstruction syndrome (SOS) in rat models. METHODS: Rat SOS models of various severities were created by monocrotaline gavage (n = 40) or by intraperitoneal injection of 5-fluorouracil, leucovorin and oxaliplatin (FOLFOX) (n = 16). Liver shear-wave velocity (SWV) was measured using ARFI elastography. Liver samples were analysed for the SOS score, steatosis, lobular inflammation and fibrosis...
December 7, 2017: European Radiology
https://www.readbyqxmd.com/read/29197912/point-shear-wave-elastography-pswe-using-acoustic-radiation-force-impulse-arfi-imaging-a-feasibility-study-and-norm-values-for-renal-parenchymal-stiffness-in-healthy-children-and-adolescents
#6
Lilian Grass, Nora Szekely, Abdulsattar Alrajab, Thi Thanh Tam Bui-Ta, Georg Friedrich Hoffmann, Elke Wühl, Jens-Peter Schenk
AIMS: To evaluate the applicability of point shear wave elastography (pSWE) for measuring renal parenchymal stiffness in healthy children and adolescents and to establish norm values for shear wave speed (SWS) using two ARFI methods and ultrasound probes. MATERIAL AND METHODS: We prospectively investigated 264 children (43.9% males). pSWE (Virtual TouchTM Quantification and Virtual TouchTM Imaging Quantification (VTQ and VTIQ; Siemens, Germany)) was performed in the renal cortex of 528 healthy kidneys using a 1-6 MHz convex and a 4-9 MHz linear ultrasound probe in ventrolateral and dorsal examinations...
November 29, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/29177930/value-of-in-vitro-acoustic-radiation-force-impulse-application-on-uterine-adenomyosis
#7
Tevfik Berk Bildaci, Halime Cevik, Birnur Yilmaz, Guldeniz Aksan Desteli
PURPOSE: Adenomyosis is the presence of endometrial glandular and stromal tissue in the myometrium. This phenomenon can be the cause of excessive bleeding and menstrual pain in premenopausal women. Diagnosis of adenomyosis may present difficulty with conventional methods such as ultrasound and magnetic resonance imaging. Frequently, diagnosis is accomplished retrospectively based on the hysterectomy specimen. MATERIALS AND METHODS: This is a prospective case control study done in vitro on 90 patients' hysterectomy specimens...
November 24, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/29176844/prospective-comparison-among-transient-elastography-supersonic-shear-imaging-and-arfi-imaging-for-predicting-fibrosis-in-nonalcoholic-fatty-liver-disease
#8
Myoung Seok Lee, Jeong Mo Bae, Sae Kyung Joo, Hyunsik Woo, Dong Hyeon Lee, Yong Jin Jung, Byeong Gwan Kim, Kook Lae Lee, Won Kim
The diagnostic performance of supersonic shear imaging (SSI) in comparison with those of transient elastography (TE) and acoustic radiation force impulse imaging (ARFI) for staging fibrosis in nonalcoholic fatty liver disease (NAFLD) patients has not been fully assessed, especially in Asian populations with relatively lean NAFLD compared to white populations. Thus, we focused on comparing the diagnostic performances of TE, ARFI, and SSI for staging fibrosis in a head-to-head manner, and identifying the clinical, anthropometric, biochemical, and histological features which might affect liver stiffness measurement (LSM) in our prospective biopsy-proven NAFLD cohort...
2017: PloS One
https://www.readbyqxmd.com/read/29121718/non-invasive-assessment-of-liver-changes-in-eisenmenger-patients
#9
Siegrun Mebus, Nicole Nagdyman, Johanna Kügel, Reinhart Zachoval, Siegmund Lorenz Braun, Guido Haverkämper, Bernd Opgen-Rhein, Felix Berger, Sophia Horster, Jörg Schoetzau, Claudia Pujol Salvador, Ulrike Bauer, John Hess, Peter Ewert, Harald Kaemmerer
BACKGROUND: Eisenmenger syndrome as a severe form of cyanotic congenital heart disease results in a complex multisystemic disorder. Due to increased systemic venous pressure and the inability to ensure systemic perfusion and metabolic requirements, the liver may develop congestion, fibrosis or cirrhosis. This study aimed to assess hepatic abnormalities in Eisenmenger patients non-invasively. METHODS AND RESULTS: 10 adults with Eisenmenger syndrome (six female; median age 44...
December 15, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/29103357/noninvasive-liver-assessment-in-adult-patients-with-fontan-circulation-using-acoustic-radiation-force-impulse-elastography-and-hepatic-magnetic-resonance-imaging
#10
F Buendía-Fuentes, J L Melero-Ferrer, D Plaza-López, J Rueda-Soriano, A Osa-Saez, J Aguero, P Calvillo-Batllés, C Fonfria-Esparcia, A Ballesta-Cuñat, L Martí-Bonmatí, L Martínez-Dolz
BACKGROUND: Patients who have undergone the Fontan procedure are at risk of developing hepatic dysfunction. However, broad recommendations regarding liver monitoring are limited. The purpose of this study was to characterize the frequency of liver disease in adult Fontan patients using multimodality imaging (hepatic magnetic resonance imaging [MRI], acoustic radiation force impulse [ARFI] elastography, or hepatic ultrasound). METHODS: In a prospective cross-sectional analysis of adult patients palliated with a Fontan procedure, hepatic MRI, ARFI, and hepatic ultrasound were used to assess for liver disease...
January 1, 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/29101980/acr-appropriateness-criteria%C3%A2-chronic-liver%C3%A2-disease
#11
Jeanne M Horowitz, Ihab R Kamel, Hina Arif-Tiwari, Sumeet K Asrani, Nicole M Hindman, Harmeet Kaur, Michelle M McNamara, Richard B Noto, Aliya Qayyum, Tasneem Lalani
Because liver fibrosis can be treated, it is important to diagnose liver fibrosis noninvasively and monitor response to treatment. Although ultrasound (grayscale and Doppler) can diagnose cirrhosis, it does so unreliably using morphologic and sonographic features and cannot diagnose the earlier, treatable stages of hepatic fibrosis. Transient elastography, ultrasound elastography with acoustic radiation force impulse, and MR elastography are modalities that can assess for hepatic fibrosis. Although all international organizations recommend ultrasound for screening for hepatocellular carcinoma, ultrasound is particularly limited for identifying hepatocellular carcinoma in patients with obesity, nonalcoholic fatty liver disease, and nodular cirrhotic livers...
November 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/29069254/accuracy-of-transient-elastography-fibroscan%C3%A2-acoustic-radiation-force-impulse-arfi-imaging-the-enhanced-liver-fibrosis-elf-test-apri-and-the-fib-4-index-compared-with-liver-biopsy-in-patients-with-chronic-hepatitis-c
#12
Taisa Grotta Ragazzo, Denise Paranagua-Vezozzo, Fabiana Roberto Lima, Daniel Ferraz de Campos Mazo, Mário Guimarães Pessoa, Claudia Pinto Oliveira, Venancio Avancini Ferreira Alves, Flair José Carrilho
OBJECTIVES: Although liver biopsy is the gold standard for determining the degree of liver fibrosis, issues regarding its invasiveness and the small amount of liver tissue evaluated can limit its applicability and interpretation in clinical practice. Non-invasive evaluation methods for liver fibrosis can address some of these limitations. The aim of this study was to evaluate the accuracy of transient elastography-FibroScan®, acoustic radiation force impulse (ARFI), enhanced liver fibrosis (ELF), the aspartate aminotransferase-to-platelet ratio index (APRI), and the FIB-4 index compared with liver biopsy in hepatitis C...
October 2017: Clinics
https://www.readbyqxmd.com/read/29068984/diagnostic-value-of-acoustic-radiation-force-impulse-imaging-for-assessing-superficial-lymph-nodes-a-diagnostic-accuracy-study
#13
Fengjuan Zhang, Xinming Zhao, Xiaohui Ji, Ruoling Han, Ping Li, Min Du
The aim of this study was to assess the diagnostic value of acoustic radiation force impulse (ARFI) imaging for differentiating superficial lymph nodes.Virtual touch tissue imaging (VTI) grade and shear wave velocity (SWV) were analyzed and compared in 97 patients (65 women, 32 men; mean age, 49 y; range, 23-72 y) with 97 lymph nodes [23 chronic nonspecific reactive lymph nodes (CLNs), 38 metastatic lymph nodes (MLNs), and 36 blood and lymphatic system diseases lymph nodes (BLLNs)]. The elastography characteristics in patients with CLNs, MLNs, and BLLNs were compared using the nonparametric Kruskal-Wallis test and Mann-Whitney U test for continuous variables and categorical variables...
October 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29066092/longitudinal-monitoring-of-liver-stiffness-by-acoustic-radiation-force-impulse-imaging-in-patients-with-chronic-hepatitis%C3%A2-b-receiving-entecavir
#14
Sheng-Di Wu, Hong Ding, Li-Li Liu, Yuan Zhuang, Yun Liu, Li-Sha Cheng, Si-Qi Wang, Yu-Jen Tseng, Ji-Yao Wang, Wei Jiang
BACKGROUND: Acoustic radiation force impulse (ARFI) imaging measures liver stiffness (LS), which significantly correlates with the stage of liver fibrosis in treatment-naive patients with chronic hepatitis B (CHB). AIM: We aimed to prospectively assess the clinical usefulness of ARFI during long-term antiviral therapy in CHB. METHOD: Seventy-one CHB patients were consecutively recruited and paired liver biopsies were performed in 27 patients...
October 21, 2017: Clinics and Research in Hepatology and Gastroenterology
https://www.readbyqxmd.com/read/29064111/acoustic-radiation-force-impulse-quantification-in-the-evaluation-of-thyroid-elasticity-in-pediatric-patients-with-hashimoto-thyroiditis
#15
Serap Yucel, Meltem Ceyhan Bilgici, Cengiz Kara, Gulay Can Yilmaz, H Murat Aydin, Muzaffer Elmali, Leman Tomak, Dilek Saglam
OBJECTIVES: To evaluate the parenchymal elasticity of the thyroid gland with acoustic radiation force impulse imaging in pediatric patients with Hashimoto thyroiditis and to compare it with healthy volunteers. METHODS: Twenty-six patients with Hashimoto thyroiditis and 26 healthy volunteers between 6 and 17 years were included. The shear wave velocity (SWV) values of both thyroid lobes in both groups were evaluated. RESULTS: The age and sex characteristics of the controls and patients with Hashimoto thyroiditis were similar...
October 24, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29060526/the-influence-of-hepatic-steatosis-on-the-evaluation-of-fibrosis-with-non-alcoholic-fatty-liver-disease-by-acoustic-radiation-force-impulse
#16
Yanrong Guo, Haoming Lin, Xinyu Zhang, Huiying Wen, Siping Chen, Xin Chen
Acoustic radiation force impulse (ARFI) elastography is a non-invasive method for the assessment of liver by measuring liver stiffness. The aim of this study is to evaluate the accuracy of ARFI for the diagnosis of liver fibrosis and to assess impact of steatosis on liver fibrosis stiffness measurement, in rats model of non-alcoholic fatty liver disease (NAFLD). The rat models were conducted in 59 rats. The right liver lobe was processed and embedded in a fabricated gelatin solution. Liver mechanics were measured using shear wave velocity (SWV) induced by acoustic radiation force...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060525/arfi-variance-of-acceleration-voa-for-noninvasive-characterization-of-human-carotid-plaques-in-vivo
#17
Gabriela Torres, Tomasz J Czernuszewicz, Jonathon W Homeister, Mark A Farber, Caterina M Gallippi
Rather than degree of stenosis, assessing plaque structure and composition is relevant to discerning risk for plaque rupture with downstream ischemic event. The structure and composition of carotid plaque has been assessed noninvasively using Acoustic Radiation Force Impulse (ARFI) ultrasound imaging. In particular, ARFI-derived peak displacement (PD) estimations have been demonstrated for discriminating soft (lipid rich necrotic core (LRNC) or intraplaque hemorrhage (IPH)) from stiff (collagen (COL) or calcium (CAL)) plaque features; however, PD did not differentiate LRNC from IPH or COL from CAL...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29032665/does-standoff-material-affect-acoustic-radiation-force-impulse-elastography-a-preclinical-study-of-a-modified-elastography-phantom
#18
Katharina Hollerieth, Bernhard Gaßmann, Stefan Wagenpfeil, Stephan Kemmner, Uwe Heemann, Konrad Friedrich Stock
Purpose: This study was conducted to determine the influence of standoff material on acoustic radiation force impulse (ARFI) measurements in an elasticity phantom by using two different probes. Methods: Using ARFI elastography, 10 observers measured the shear wave velocity (SWV, m/sec) in different lesions of an elasticity phantom with a convex 4C1 probe and a linear 9L4 probe. The experimental setup was expanded by the use of an interposed piece of porcine muscle as standoff material...
July 28, 2017: Ultrasonography
https://www.readbyqxmd.com/read/29018925/the-diagnostic-performance-of-shear-wave-elastography-for-liver-fibrosis-in-children-and-adolescents-a-systematic-review-and-diagnostic-meta-analysis
#19
Jeong Rye Kim, Chong Hyun Suh, Hee Mang Yoon, Jin Seong Lee, Young Ah Cho, Ah Young Jung
OBJECTIVE: To assess the diagnostic performance of shear-wave elastography for determining the severity of liver fibrosis in children and adolescents. METHODS: An electronic literature search of PubMed and EMBASE was conducted. Bivariate modelling and hierarchical summary receiver-operating-characteristic modelling were performed to evaluate the diagnostic performance of shear-wave elastography. Meta-regression and subgroup analyses according to the modality of shear-wave imaging and the degree of liver fibrosis were also performed...
October 10, 2017: European Radiology
https://www.readbyqxmd.com/read/28965721/prospective-comparison-of-the-diagnostic-performance-of-magnetic-resonance-elastography-with-acoustic-radiation-force-impulse-elastography-for-pre-operative-staging-of-hepatic-fibrosis-in-patients-with-hepatocellular-carcinoma
#20
Chen-Te Chou, Ran-Chou Chen, Wen-Pei Wu, Ping-Yi Lin, Yao-Li Chen
The purpose of this study was to compare the diagnostic accuracy of magnetic resonance (MR) elastography with that of acoustic radiation force impulse (ARFI) elastography for pre-operative staging of hepatic fibrosis in patients with hepatocellular carcinoma. We prospectively enrolled 77 patients who were scheduled to undergo hepatectomy for hepatocellular carcinoma. Pre-operative MRE and ARFI elastography examinations were performed on the same day, and liver stiffness/velocity values were determined. Fibrosis stage and necro-inflammatory activity of resected specimens were determined histopathologically using the METAVIR scoring system...
September 28, 2017: Ultrasound in Medicine & Biology
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