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Ultrasound in Medicine & Biology

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https://www.readbyqxmd.com/read/29784438/accuracy-and-reproducibility-of-sonoelastography-for-the-assessment-of-fibroids-and-adenomyosis-with-magnetic-resonance-imaging-as-reference-standard
#1
Barbara Stoelinga, Wouter J K Hehenkamp, Lotte L Nieuwenhuis, Mandy M A Conijn, JanHein H T M van Waesberghe, Hans A M Brölmann, Judith A F Huirne
The aims of this prospective diagnostic evaluation study were (i) to estimate the inter-observer agreement and reproducibility of real-time sonoelastography and real-time gray-scale ultrasound in the measurement of uterine and fibroid volumes; (ii) to evaluate the agreement between real-time gray-scale ultrasound, sonoelastography and magnetic resonance imaging with respect to these outcomes; and (iii) to evaluate the diagnostic accuracy of sonoelastography in the diagnosis of uterine pathology on stored sonoelastography and gray-scale cine loops...
May 18, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29784437/jugular-venous-flow-quantification-using-doppler-sonography
#2
Karen Marr, Dejan Jakimovski, Marcello Mancini, Ellen Carl, Robert Zivadinov
A consensus on venous flow quantification using echo spectral Doppler sonography is lacking. Doppler sonography data from 83 healthy individuals were examined using manually traced transverse cross-sectional area and diameter-derived cross-sectional area obtained in longitudinal view measurements of the internal jugular vein. Time-averaged velocity over a 4-s interval was obtained in the longitudinal plane using manual tracing of the waveform. Manual and computer-generated blood flow volume calculations were also obtained for the common carotid artery, for accuracy purposes...
May 18, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29784436/a-3-d-region-growing-motion-tracking-method-for-ultrasound-elasticity-imaging
#3
Yuqi Wang, Jingfeng Jiang, Timothy J Hall
A 3-D region-growing motion-tracking (RGMT) method for ultrasound elasticity imaging is described. This 3-D RGMT method first estimates the displacements at a sparse subset of points, called seeds; uses an objective measure to determine, among those seeds, which displacement estimates to trust; and then performs RGMT in three dimensions to estimate displacements for the remaining points in the field. During the growing process in three dimensions, the displacement estimate at one grid point is employed to guide the displacement estimation of its neighboring points using a 3-D small search region...
May 18, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29779888/adaptive-color-gain-for-vena-contracta-quantification-in-valvular-regurgitation
#4
Pawel Kozlowski, Alfonso Rodriguez-Molares, Thor Andreas Tangen, Kjell Kristoffersen, Hans Torp, Olivier Gerard, Eigil Samset
Severe valvular regurgitation can lead to pulmonary hypertension, atrial fibrillation and heart failure. Vena contracta width is used to estimate the severity of the regurgitation. Parameters affecting visualization of color Doppler have a significant impact on the measurement. We propose a data-driven method for automated adjustment of color gain based on the peak power of the color Doppler signal in the vicinity of the vena contracta. A linear regression model trained on the peak power was used to predict the orifice diameter...
May 17, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29779887/pulmonary-capillary-hemorrhage-induced-by-diagnostic-ultrasound-in-ventilated-rats
#5
Douglas L Miller, Zhihong Dong, Chunyan Dou, Krishnan Raghavendran
Pulmonary capillary hemorrhage (PCH) can be induced by diagnostic ultrasound-a potential safety issue. Anesthetized rats were intubated for intermittent positive-pressure ventilation (IPPV) with 0 end-expiratory pressure, +4 cm H2 O end-expiratory pressure (PEEP) and -4 cm H2 O end-expiratory pressure (NEEP). Rats were imaged at 7.6 MHz with a Philips HDI 5000 ultrasound machine. The output was low (mechanical index [MI] = 0.22) for aiming and then was raised for 5 min in 20 different exposure groups with n = 8...
May 17, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29776601/echo-intensity-versus-muscle-function-correlations-in-older-adults-are-influenced-by-subcutaneous-fat-thickness
#6
Matt S Stock, Morgan Whitson, Adam M Burton, Nicole T Dawson, Eric J Sobolewski, Brennan J Thompson
Recently, an equation that allows investigators to correct echo intensity for subcutaneous fat was developed. We evaluated correlations between uncorrected and corrected echo intensity versus measures of lower-extremity function. Twenty-three older adults (11 men, 12 women; mean age = 72 y) participated. B-Mode ultrasonography was used to quantify rectus femoris echo intensity and subcutaneous fat thickness. Knee extensor isometric peak torque and rate of torque development at 200 ms (RTD200) were determined (joint angle = 90°)...
May 15, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29776600/contrast-enhanced-ultrasound-quantifies-the-perfusion-within-tibial-non-unions-and-predicts-the-outcome-of-revision-surgery
#7
Daniel Krammer, Gerhard Schmidmaier, Marc-André Weber, Julian Doll, Christoph Rehnitz, Christian Fischer
Vascularity is one of the factors determining successful bone regeneration. This prospective study focused on quantifying the microperfusion of tibial non-unions with contrast-enhanced ultrasound (CEUS) 12 wk after revision surgery and comparing it with the osseous consolidation at a maximum of 24 mo assessed with standard radiography and computed tomography. Of 36 patients with tibial non-unions, 28 (77.8%) manifested consolidation, and 8 patients required further revision surgery. CEUS revealed significantly higher perfusion in consolidated versus persistent non-unions for all quantification parameters (e...
May 15, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29773245/validation-of-an-open-source-tool-for-measuring-carotid-lumen-diameter-and-intima-media-thickness
#8
Hugo Luis Manterola, Lucas Lo Vercio, Alejandro Díaz, Mariana Del Fresno, Ignacio Larrabide
In low- and middle-income regions, a relatively large number of deaths occur from cardiovascular disease or stroke. Carotid intima-media thickness (cIMT) and carotid lumen diameter (cLD) are strong indicators of cardiovascular event risk and stenosis severity, respectively. The interactive open-source software described here, Cimtool, is based on active contours for measuring these indicators in clinical practice and thus helping in preventive diagnosis and treatment. Cimtool was validated using carotid phantoms and real images obtained using ultrasound...
May 14, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29759425/simultaneous-evaluation-of-thermal-and-non-thermal-effects-of-high-intensity-focused-ultrasound-on-a-tissue-mimicking-phantom
#9
Yong Tae Kim, Donghee Ma, Jai Kyoung Sim, Se-Hwa Kim
Physiologically relevant phantoms with high reliability are essential for extending the therapeutic applications of high-intensity therapeutic ultrasound. Here we describe a tissue-mimicking phantom capable of quantifying temperature changes and observing non-thermal phenomena by high-intensity therapeutic ultrasound. Using polydiacetylene liposomes, we fabricated agar-based polydiacetylene hydrogel phantoms (PHPs) that not only respond to temperature, but also have acoustic properties similar to those of human liver tissue...
May 11, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29759424/lung-ultrasound-findings-undetectable-by-chest-radiography-in-children-with-community-acquired-pneumonia
#10
Giulio Iorio, Maria Capasso, Salvatore Prisco, Giuseppe De Luca, Carlo Mancusi, Bruno Laganà, Maria Antonietta Piscopo, Vincenzo Comune
The purpose of our study was to evaluate any differences between lung ultrasonography and chest radiography (CR) images in children with a diagnosis of community-acquired pneumonia (CAP) and, if there are any, to analyze the reasons and possible clinical implications. We reviewed the medical records of patients admitted to the pediatric ward from January 2014 to December 2016 and selected only cases discharged with a diagnosis of CAP who had undergone performed lung ultrasound (LUS) and CR within 24 h of each other...
May 11, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29754702/evaluating-renal-transplant-status-using-viscoelastic-response-visr-ultrasound
#11
Md Murad Hossain, Mallory R Selzo, Robert M Hinson, Leslie M Baggesen, Randal K Detwiler, Wui K Chong, Lauren M Burke, Melissa C Caughey, Melrose W Fisher, Sonya B Whitehead, Caterina M Gallippi
Chronic kidney disease is most desirably and cost-effectively treated by renal transplantation, but graft survival is a major challenge. Although irreversible graft damage can be averted by timely treatment, intervention is delayed when early graft dysfunction goes undetected by standard clinical metrics. A more sensitive and specific parameter for delineating graft health could be the viscoelastic properties of the renal parenchyma, which are interrogated non-invasively by Viscoelastic Response (VisR) ultrasound, a new acoustic radiation force (ARF)-based imaging method...
May 10, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29747968/prenatal-diagnosis-of-abnormal-invasive-placenta-by-ultrasound-measurement-of-highest-peak-systolic-velocity-of-subplacental-blood-flow
#12
Junling Zhang, Hezhou Li, Fang Wang, Hongyan Qin, Qiaohong Qin
The aim of the study described here was to identify an efficient criterion for the prenatal diagnosis of abnormal invasive placenta. We evaluated 129 women with anterior placenta previa who underwent trans-abdominal ultrasound evaluation in the third trimester. Spectral Doppler ultrasonography was performed to assess the subplacental blood flow of the anterior lower uterine segment by measuring the highest peak systolic velocity and resistive index. These patients were prospectively followed until delivery and evaluated for abnormal placental invasion...
May 7, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735317/risk-marker-variability-in-subclinical-carotid-plaques-based-on-ultrasound-is-influenced-by-cardiac-phase-echogenicity-and-size
#13
Emma Nyman, Per Lindqvist, Ulf Näslund, Christer Grönlund
Identification of risk markers based on quantitative ultrasound texture analysis of carotid plaques has the ability to define vulnerable components that correlate with increased cardiovascular risk. However, data describing factors with the potential to influence the measurement variability of risk markers are limited. The aim of this study was to evaluate the influence of electrocardiogram-guided image selection, plaque echogenicity and area on carotid plaque risk markers and their variability in asymptomatic carotid plaques...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735316/use-of-contrast-enhanced-ultrasound-in-the-assessment-of-uterine-fibroids-a-feasibility-study
#14
Barbara Stoelinga, Anniek M C Dooper, Lynda J M Juffermans, Arnoud W Postema, Hessel Wijkstra, Hans A M Brölmann, Judith A F Huirne
Contrast-enhanced ultrasound (CEUS) is an innovative ultrasound technique capable of visualizing both the macro- and microvasculature of tissues. In this prospective pilot study, we evaluated the feasibility of using CEUS to visualize the microvasculature of uterine fibroids and compared CEUS with conventional ultrasound. Four women with fibroids underwent gray-scale ultrasound, sonoelastography and power/color Doppler scans followed by CEUS examination. Analysis of CEUS images revealed initial perfusion of the peripheral rim, that is, a pseudo-capsule, followed by enhancement of the entire lesion through vessels traveling from the exterior to the interior of the fibroid...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735315/accuracy-and-precision-of-a-plane-wave-vector-flow-imaging-method-in-the-healthy-carotid-artery
#15
Jonas Jensen, Carlos Armando Villagómez Hoyos, Marie Sand Traberg, Jacob Bjerring Olesen, Borislav Gueorguiev Tomov, Ramin Moshavegh, Simon Holbek, Matthias Bo Stuart, Caroline Ewertsen, Kristoffer Lindskov Hansen, Carsten Thomsen, Michael Bachmann Nielsen, Jørgen Arendt Jensen
The objective of the study described here was to investigate the accuracy and precision of a plane wave 2-D vector flow imaging (VFI) method in laminar and complex blood flow conditions in the healthy carotid artery. The approach was to study (i) the accuracy for complex flow by comparing the velocity field from a computational fluid dynamics (CFD) simulation to VFI estimates obtained from the scan of an anthropomorphic flow phantom and from an in vivo scan; (ii) the accuracy for laminar unidirectional flow in vivo by comparing peak systolic velocities from VFI with magnetic resonance angiography (MRA); (iii) the precision of VFI estimation in vivo at several evaluation points in the vessels...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735314/on-patient-related-factors-and-their-impact-on-ultrasound-based-shear-wave-elastography-of-the-liver
#16
Marie Byenfeldt, Anders Elvin, Per Fransson
The aim of the study was to investigate patient-related factors associated with either reliable or poorly reliable measurement results of ultrasound-based shear wave elastography (SWE) of the liver. A total of 188 patients were analyzed prospectively with binary logistic regression using the interquartile range/median as cutoff to define two groups based on reliable and poorly reliable SWE results. SWE results correlated significantly with liver biopsy. Factors associated with reliable SWE results (i.e., no negative impact on measurements) were age, sex, cirrhosis, antiviral and/or cardiovascular medication, smoking habits and body mass index...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735313/calculation-of-left-ventricular-diastolic-time-constant-tau-in-dogs-with-mitral-regurgitation-using-continuous-wave-doppler
#17
Chaoyang Wen, Jing Sun, Chunzhi Fan, Jianping Dou
The left ventricular diastolic time constant (Tau) cannot be practically measured non-invasively. Thus, the aim of this study was to investigate a new method for the evaluation of Tau using continuous-wave (CW) Doppler in dogs with mitral regurgitation. Guided by ultrasound, we created 12 beagle models of mitral regurgitation and acute ischemic left ventricular diastolic dysfunction. Raw audio signals of the CW Doppler spectra were collected, and new mitral regurgitation Doppler spectra were observed after computer re-processing...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29735312/steato-score-non-invasive-quantitative-assessment-of-liver-fat-by-ultrasound-imaging
#18
Nicole Di Lascio, Cinzia Avigo, Antonio Salvati, Nicola Martini, Monica Ragucci, Serena Monti, Anna Prinster, Dante Chiappino, Marcello Mancini, Domenico D'Elia, Lorenzo Ghiadoni, Ferruccio Bonino, Maurizia R Brunetto, Francesco Faita
Non-alcoholic fatty liver disease is becoming a global epidemic. The aim of this study was to develop a system for assessing liver fat content based on ultrasound images. Magnetic resonance spectroscopy measurements were obtained in 61 patients and the controlled attenuation parameter in 54. Ultrasound images were acquired for all 115 participants and used to calculate the hepatic/renal ratio, hepatic/portal vein ratio, attenuation rate, diaphragm visualization and portal vein wall visualization. The Steato-score was obtained by combining these five parameters...
May 4, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29731186/a-novel-fibroscan-examination-dedicated-to-spleen-stiffness-measurement
#19
Cécile Bastard, Véronique Miette, Paul Calès, Horia Stefanescu, Davide Festi, Laurent Sandrin
Esophageal varices (EVs) are among the most severe complications of cirrhosis, with a prevalence of 50% to 60% among cirrhotic patients. International guidelines therefore recommend that cirrhotic patients should be screened for the presence of EVs. The main objective of this study was to introduce a new spleen-dedicated FibroScan (Echosens, Paris, France) examination and to assess its performance in detecting large EVs (grade 2 and 3). This novel examination has been validated in simulation and phantom studies and has been used in a population of patients with chronic liver disease...
May 3, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29730067/contrast-enhanced-ultrasonography-in-sclerotherapy-for-ovarian-endometrial-cyst
#20
Xiao-Hui Shao, Xiao-Qiu Dong, De-Jiao Kong, Li-Wei Zhang, Lu-Lu Wang, Si-Ming Wang
We investigated contrast-enhanced ultrasonography (CEUS) characteristics related to the perfusion pattern and parameters of the time-intensity curve of ovarian endometrial cysts (OECs) pre- and post-sclerotherapy. Forty-three patients with one-sided, single, untreated OECs underwent CEUS pre- and post-sclerotherapy. OEC wall thickness was measured by 2-D ultrasonography and CEUS, and CEUS enhancement patterns and time-intensity curve parameters before and after sclerotherapy were compared. OEC wall thickness remained essentially unchanged post-sclerotherapy...
May 2, 2018: Ultrasound in Medicine & Biology
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