Read by QxMD icon Read

Acoustic radiation force impulse

Harshavardhan Nagolu, Sudhakar Kattoju, Chidambaranathan Natesan, Meera Krishnakumar, Sunil Kumar
Objective: The purpose of the study is to investigate the usefulness of acoustic radiation force impulse (ARFI) elastography in the characterization of focal solid liver lesions as benign, malignant, or metastatic using ARFI two-dimensional (2D) imaging and ARFI quantification (shear wave velocities [SWVs]). Materials and Methods: Sixty lesions were included in this study. The lesions were classified into three groups: Group I included benign lesions ( n = 25), Group II included malignant lesions ( n = 27), and Group III included metastatic lesions ( n = 8)...
2018: Journal of Clinical Imaging Science
Yavuz Selim Karatekin, Bedri Karaismailoglu, Gokhan Kaynak, Tahir Ogut, Atilla Suleyman Dikici, Emel Ure Esmerer, Onder Aydingoz, Huseyin Botanlioglu
BACKGROUND: Achilles tendon injuries are one of the most common tendon injuries. Surgical treatment is preferred in young and active patients. Although there are studies which evaluate the repair area with magnetic resonance imaging and ultrasonography after surgical treatment, there are very few studies which analyzes the elasticity of the tendon by quantitative methods. ARFI (acoustic radiation force impulse) elastography is a simple and non-invasive method that can quantitatively measure the elasticity of the soft tissues...
March 2, 2018: Journal of Orthopaedic Surgery and Research
Harun Arslan, Harun Egemen Tolunay, Numan Cim, Barış Boza, Alpaslan Yavuz, İbrahim İlik, Hanim Guler Sahin, Recep Yildizhan
OBJECTIVE: In this study, we aimed to evaluate the elasticities of fetal placentas with a single umbilical artery using the Virtual Touch Tissue Quantification (VTTQ) technique. MATERIALS AND METHODS: Pregnant women with fetuses with a single umbilical artery (SUA) and pregnant women with fetuses having three vessel cord (3VC) at 18-22 weeks of gestation were enrolled in the research. The placentas were evaluated and divided into three equal parts as the inner 1/3 of the placenta (fetal edge), the outer 1/3 of the placenta (maternal edge) and the central 1/3 of the placenta (central part)...
February 25, 2018: Journal of Maternal-fetal & Neonatal Medicine
Michael V Di Maria, Lindsey Silverman, Adel K Younoszai, Mariana L Meyers, Kelley E Capocelli, Michael R Narkewicz
BACKGROUND: The current management paradigm for children with single ventricle heart disease involves a series of palliative surgeries, culminating in the Fontan operation. This physiology results in a high central venous pressure, and in the setting of single ventricle heart disease, results in hepatic injury and fibrosis over time. Fontan-associated liver disease (FALD) is universally present in this cohort, and the current gold standard for diagnosis remains biopsy. Noninvasive assessments of liver fibrosis, such as ultrasound with elastography or acoustic radiation force impulse (ARFI), has been utilized in this cohort...
February 23, 2018: Congenital Heart Disease
Elliot B Tapper, Rohit Loomba
NAFLD is a global epidemic. The prevalence of NAFLD is 20-30% in North America, northern Europe, Australia, Japan, India and China. It is crucial that patients with NAFLD receive an assessment for their risk of advanced fibrosis, which increases the risk of hepatocellular carcinoma and other complications of cirrhosis. Risk stratification that is efficient, cost-effective, patient-centred and evidence-based is one of the most important issues facing clinicians who care for those with liver disease. Given patients' preference to avoid liver biopsy, noninvasive alternatives to assess liver fibrosis are in high demand...
February 21, 2018: Nature Reviews. Gastroenterology & Hepatology
Marcus Antonio Rossi Feliciano, Ricardo Andrés Uscategui Ramirez, Marjury Cristina Maronezi, Giovanna Serpa Maciel, Michelle Lopes Avante, Igor Luiz Salardani Senhorello, Talita Mucédola, Beatriz Gasser, Cibele Figueira Carvalho, Wilter Ricardo Russiano Vicente
Due to the importance of presurgical, noninvasive, and accurate diagnostic tools in mammary carcinoma characterization, this prospective secondary observational cohort study was designed to evaluate and compare the diagnostic accuracy of B-mode, Doppler, contrast enhancement ultrasonography, or acoustic radiation force impulse-elastography in identifying mammary carcinomas types with high degree of malignancy. A total of 246 mammary carcinomas from 141 female dogs were analyzed using B-mode, Doppler, contrast enhancement ultrasonography, and acoustic radiation force impulse ultrasonography prior to their histopathological classification according to types (simple, complex, or special) and grade (I, II, or III)...
February 11, 2018: Veterinary Radiology & Ultrasound
Gi Young Park, Dong Rak Kwon, Dae Gil Kwon
Congenital muscular torticollis (CMT) is characterized by shortening or excessive contraction of the sternocleidomastoid muscle (SCM). The main purpose of this study was to evaluate the feasibility of quantifying SCM stiffness using acoustic radiation force impulse (ARFI) sonoelastography in infants with CMT. Twenty infants with an SCM thickness greater than 10 mm with or without involvement of the entire SCM length (limitation of neck rotation passive range of motion [PROM]: group 1S >30°, group 1M = 15°-30°) and 12 infants with an SCM thickness smaller than 10 mm with or without involvement of any part of SCM (group 2) were included...
February 2018: Medicine (Baltimore)
Hui Liu, Guang Xu, Ming-Hua Yao, Huan Pu, Yan Fang, Li-Hua Xiang, Rong Wu
Background: To evaluate whether conventional ultrasound, elastography [conventional strain elastography of elasticity imaging, acoustic radiation force impulse induced strain elastography of virtual touch tissue imaging, and a novel two-dimensional shear wave elastography of virtual touch tissue imaging quantification] and clinicopathological factors are associated with axillary lymph node metastasis in invasive ductal breast carcinoma with sizes > 10 mm. Materials and Methods: We evaluated 150 breast lesions from 148 patients using the above methods and the clinicopathological factors...
January 5, 2018: Oncotarget
David S Hersh, Pavlos Anastasiadis, Ali Mohammadabadi, Ben A Nguyen, Sijia Guo, Jeffrey A Winkles, Anthony J Kim, Rao Gullapalli, Asaf Keller, Victor Frenkel, Graeme F Woodworth
Generating spatially controlled, non-destructive changes in the interstitial spaces of the brain has a host of potential clinical applications, including enhancing the delivery of therapeutics, modulating biological features within the tissue microenvironment, altering fluid and pressure dynamics, and increasing the clearance of toxins, such as plaques found in Alzheimer's disease. Recently we demonstrated that ultrasound can non-destructively enlarge the interstitial spaces of the brain ex vivo. The goal of the current study was to determine whether these effects could be reproduced in the living brain using non-invasive, transcranial MRI-guided focused ultrasound (MRgFUS)...
2018: PloS One
Takuji Iyama, Tomoaki Takata, Masahiko Koda, Satoko Fukuda, Shotaro Hoi, Yukari Mae, Takeaki Fukui, Chishio Munemura, Hajime Isomoto
PURPOSE: To investigate the association of renal elasticity to microscopic findings of nephron hypertrophy and nephrosclerosis. METHODS: Patients who underwent renal biopsy were enrolled. Renal elasticity was measured by acoustic radiation force impulse, and nephron size (glomerular volume, non-sclerotic glomerular density, and mean profile tubular area) and nephrosclerosis (globally sclerotic glomeruli and interstitial fibrosis) were estimated. Nephron hypertrophy was indicated by larger glomerular volume, larger tubular area, and lower non-sclerotic glomerular density...
February 6, 2018: Journal of Medical Ultrasonics
Hyun Joo Shin, Myung-Joon Kim, Choon-Sik Yoon, Kwanseop Lee, Kwan Sik Lee, Jong-Chul Park, Mi-Jung Lee, Haesung Yoon
AIMS: To evaluate the differences between shear wave velocities (SWVs) measured with ultrasound elastography during the continuous motion using liver fibrosis phantoms. MATERIALS AND METHODS: Elasticities were measured with convex and linear transducers of supersonic shear wave imaging (SSI) and acoustic radiation force impulse imaging (ARFI) using liver elasticity phantoms (3.0 and 16.9 kPa) at depths of 2, 3, 4, and 5 cm. Motion velocities were 30 and 60 rpm with the phantoms in an upright position on the Orbital shaker...
February 4, 2018: Medical Ultrasonography
Jing Gao, Wen He, Li-Juan Du, Johnson Chen, David Park, Michael Wells, Brian Fowlkes, Michael O'Dell
We prospectively investigated the feasibility of using quantitative ultrasound imaging (QUI) to assess the biceps brachii muscle (BBM) in individuals with chronic post-stroke spasticity. To quantify muscle echogenicity and stiffness, we measured QUI parameters (gray-scale pixel value and shear wave velocity [SWV, m/s]) of the BBM in three groups: 16 healthy BBMs; 12 post-stroke, non-spastic BBMs; and 12 post-stroke, spastic BBMs. The QUI results were compared with the Modified Ashworth Scale and Tardieu Scale...
February 2, 2018: Ultrasound in Medicine & Biology
Duzgun Yildirim, Deniz Alis, Alev Bakir, Fethi E Ustabasioglu, Cesur Samanci, Bulent Colakoglu
Aim: Differential diagnosis of parenchymal thyroid diseases by gray-scale ultrasound is quite difficult for a radiologist as the findings are very similar to each other. In this study we aimed to assess some quantitative spectral Doppler parameters, resistivity index (RI), acceleration time (AT), and quantitative elastography [shear wave velocity (SWV)] together to show their reliability for differential diagnosis of parenchymal thyroid diseases. Materials and Methods: We retrospectively reviewed findings of 227 patients (179 females, 48 males) that underwent spectral Doppler ultrasound and acoustic radiation force impulse between October 2013 and March 2016...
October 2017: Indian Journal of Radiology & Imaging
Birnur Yilmaz
OBJECTIVE: To investigate the value of Acoustic Radiation Force Impulse elastography and its application in Achilles tendon elasticity of intermittent claudication due to lower extremity arterial ischaemia. METHODS: This prospective case-control study was conducted at the Department of Radiology, Faculty of Medicine, Baskent University, Istanbul, Turkey, from October 2015 to January 2016, and comprised bilateral Achilles tendons of patients with intermittent claudication and healthy individuals...
January 2018: JPMA. the Journal of the Pakistan Medical Association
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
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
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
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
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
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
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"