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Ultrasound in Medicine & Biology

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https://www.readbyqxmd.com/read/30007477/classification-of-tendon-matrix-change-using-ultrasound-imaging-a-systematic-review-and-meta-analysis
#1
REVIEW
Wesley Matthews, Richard Ellis, James Furness, Wayne Hing
Ultrasound imaging (US) is an accurate and reliable method used to diagnose tendinopathy. This systematic review was aimed at identifying common criteria and parameters used to diagnose tendinopathy, the methodological quality of studies and the predictive value of US. Nineteen studies met the inclusion criteria, with the Achilles, quadriceps and patella tendons being investigated. Overall, there was significant heterogeneity between the criteria used to diagnose tendinopathy utilising US. The methodological quality of included studies was "good...
July 11, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/30006214/evaluation-of-gastric-emptying-by-transabdominal-ultrasound-after-oral-administration-of-semisolid-cellulose-based-gastric-ultrasound-contrast-agents
#2
Zhijun Liu, Zhining Liu, Yuhong Li, Jintao Guo, Jianmin Li, Weidong Ren, Shaoshan Tang, Limei Xie, Ying Huang, Liping Huang, Siyu Sun, Ying Zhao
Many previous studies have found that transabdominal ultrasound may allow precise measurement of gastric emptying of liquid meals. However, the clinical use of this technique has been hampered by the limitation that transabdominal ultrasound might not accurately measure gastric emptying of solid meals. It is more important to measure gastric emptying of solids instead of liquids, as gastric emptying of solids is more often delayed than gastric emptying of liquids in gastric motility disorders. Recently, transabdominal ultrasound after oral administration of a cellulose-based gastric contrast agents (TUS-OSCA) has been suggested to be effective in initial screening of gastric lesions...
July 10, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/30006213/high-frequency-micro-ultrasound-imaging-and-optical-topographic-imaging-for-spinal-surgery-initial-experiences
#3
Raphael Jakubovic, Joel Ramjist, Shaurya Gupta, Daipayan Guha, Arjun Sahgal, F Stuart Foster, Victor X D Yang
High frequency micro-ultrasound (µUS) transducers with central frequencies up to 50 MHz facilitate dynamic visualization of patient anatomy with minimal disruption of the surgical work flow. Micro-ultrasound improves spatial resolution over conventional ultrasound imaging from millimeter to micrometer, but compromises depth penetration. This trade-off is sufficient during an open surgery in which the bone is removed and the ultrasound probe can be placed into the surgical cavity. By fusing µUS with pre-operative imaging and tracking the ultrasound probe intra-operatively using our optical topographic imaging technology, we can provide dynamic feedback during surgery, thus affecting clinical decision making...
July 10, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29980452/usefulness-of-left-ventricular-vortex-flow-analysis-for-predicting-clinical-outcomes-in-patients-with-chronic-heart-failure-a-quantitative-vorticity-imaging-study-using-contrast-echocardiography
#4
In-Cheol Kim, Geu-Ru Hong, Gianni Pedrizzetti, Chi Young Shim, Seok-Min Kang, Namsik Chung
The goal of the study described here was to evaluate whether left ventricular vortex flow parameters, as assessed by contrast echocardiography, enhance prediction of major adverse cardiac events (MACE) in patients with chronic heart failure and systolic dysfunction. A total of 75 patients with contrast echocardiography and systolic dysfunction (ejection fraction ≤45%) were prospectively enrolled and underwent vortex flow analysis with particle image velocimetry using contrast echocardiography. Vortex flow parameters, including kinetic energy fluctuation (KEF), were evaluated...
July 3, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29980451/application-of-arfi-swv-in-stiffness-measurement-of-the-abdominal-wall-musculature-a-pilot-feasibility-study
#5
David A Gabrielsen, Martin J Carney, Jason M Weissler, Michael A Lanni, Jorge Hernandez, Laith R Sultan, Fabiola Enriquez, Chandra M Sehgal, John P Fischer, Anil Chauhan
The purpose of this study was to assess the feasibility of acoustic radiation force impulse shear wave velocity and textural features for characterizing abdominal wall musculature and to identify subject-related and technique-related factors that can potentially affect measurements. Median shear wave velocity measurements for the right external abdominal oblique were the same (1.89 ± 0.16 m/s) for both the active group (healthy volunteers with active lifestyles) and the control group (age and body mass index-matched volunteers from an ongoing hernia study)...
July 3, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29980450/postoperative-chest-ultrasound-findings-and-effectiveness-after-thoracic-surgery-a-pilot-study
#6
Marco Chiappetta, Elisa Meacci, Alfredo Cesario, Andrea Smargiassi, Riccardo Inchingolo, Leonardo Petracca Ciavarella, Stefania Lopatriello, Andrea Contegiacomo, Maria Teresa Congedo, Stefano Margaritora
The aim of this study was to analyze the information from post-operative chest ultrasound (CU) to evaluate the possibility to use this method instead of chest X-ray (CXR) after thoracic surgery. Patients who underwent thoracic surgery were evaluated with CU blinded to CXR after surgery, deciding if it was useful or CU was exhaustive. Twenty-four patients were enrolled prospectively. The CU allowed a further discrimination of the lung abnormalities, discriminating between atelectasis, infections or hematoma...
July 3, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29960752/respiratory-variability-of-peak-velocities-in-the-common-femoral-vein-estimated-with-vector-flow-imaging-and-doppler-ultrasound
#7
Thor Bechsgaard, Kristoffer Lindskov Hansen, Andreas Hjelm Brandt, Ramin Moshavegh, Julie Lyng Forman, Pia Føgh, Lotte Klitfod, Niels Bækgaard, Lars Lönn, Michael Bachmann Nielsen, Jørgen Arendt Jensen
Respiratory variability of peak velocities (RVPV) in the common femoral vein measured with ultrasound can reveal venous outflow obstruction. Pulse wave (PW) Doppler is the gold standard for venous velocity estimation of the lower extremities. PW Doppler measurements are angle dependent, whereas vector flow imaging (VFI) can yield angle-independent measures. The hypothesis of the present study was that VFI can provide RVPV estimations without the angle dependency of PW Doppler for an improved venous disease assessment...
June 27, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29941215/effects-of-non-thermal-non-cavitational-ultrasound-exposure-on-human-diabetic-ulcer-healing-and-inflammatory-gene-expression-in-a-pilot-study
#8
Anamika Bajpai, Sumati Nadkarni, Michael Neidrauer, Michael S Weingarten, Peter A Lewin, Kara L Spiller
The purpose of this clinical study was to assess, in a limited patient population, the potential for a novel advanced wound care treatment based on low-frequency (20 kHz) low-intensity (spatial peak temporal peak intensity <100 mW/cm2 ; i.e., pressure amplitude of 55 kPa) ultrasound (LFLI-US), to affect wound closure rate in human diabetic foot ulcers (DFUs) and to effect changes in the relative expression of pro-inflammatory and anti-inflammatory genes. The ratio of expression of these genes, termed the M1/M2 score because it was inspired by the transition of macrophages from pro-inflammatory (M1) to anti-inflammatory (M2) phenotypes as wound healing progresses, was previously presented as a potential healing indicator for DFUs treated with the standard of care...
June 22, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29941214/inactivation-of-planktonic-escherichia-coli-by-focused-1-mhz-ultrasound-pulses-with-shocks-efficacy-and-kinetics-upon-volume-scale-up
#9
Andrew A Brayman, Brian E MacConaghy, Yak-Nam Wang, Keith T Chan, Wayne L Monsky, Valery P Chernikov, Sergey V Buravkov, Vera A Khokhlova, Thomas J Matula
This study addresses inactivation of E. coli in either 5- or 10-mL volumes, which were 50- to 100-fold greater than used in an earlier study (Brayman et al. 2017). Cells were treated with 1-MHz pulsed high-intensity focused ultrasound (10 cycles, 2-kHz repetition frequency, +65/-12.8 MPa focal pressures). The surviving fraction was assessed by coliform assay, and inactivation demonstrated curvilinear kinetics. The reduction of surviving fraction to 50% required 2.5 or 6 min in 5- or 10-mL samples, respectively...
June 22, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29936025/viscoelasticity-measurement-in-rat-livers-using-shear-wave-us-elastography
#10
Katsutoshi Sugimoto, Fuminori Moriyasu, Hisashi Oshiro, Hirohito Takeuchi, Yu Yoshimasu, Yoshitaka Kasai, Yoshihiro Furuichi, Takao Itoi
To investigate the usefulness of shear-wave speed and dispersion slope measurements obtained, using an ultrasound elastography system in rat livers with various degrees of necroinflammation and fibrosis. A total of 25 male Sprague Dawley rats were randomly divided into 5 groups of 5 rats each: G0 (control), G1 (CCl4 injected twice a week for 1 wk), G2 (CCl4 injected four times a wk for 1 wk), G3 (CCl4 injected twice a wk for 6 wk) and G4 (CCl4 injected twice a wk for 10 wk). The shear-wave speed (m/s) and the dispersion slope ([m/s]/kHz) were measured...
June 21, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29936027/efficacy-of-superb-microvascular-imaging-for-diagnosing-acute-cholecystitis-comparison-with-conventional-ultrasonography
#11
Joon Chul Ra, Eun Sun Lee, Hyun Jeong Park, Hee Sung Kim, Jong Beum Lee, Jae Hyuk Do, Sung Bin Park, Byung Ihn Choi
We evaluated the diagnostic performance of ultrasonography (US) plus superb microvascular imaging (SMI) compared with conventional US alone for diagnosing acute cholecystitis. We included 54 patients with suspected biliary disease. The SMI pixel count showing flow signal was measured in the region of interest of the gallbladder bed of the liver. Two radiologists independently evaluated imaging features and rated five-point diagnostic likelihood level before versus after the additional SMI using the cutoff SMI pixel count...
June 20, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29936026/study-of-thp-1-macrophage-viability-after-sonodynamic-therapy-using-methyl-ester-of-5-aminolevulinic-acid-gold-nanoparticles
#12
Karina de Oliveira Gonçalvez, Daniel Perez Vieira, Lilia Coronato Courrol
Sonodynamic therapy (SDT) is emerging as new atherosclerosis treatment. The use of gold nanoparticles (AuNPs) as the vehicle for a sensitizer delivery improves reactive oxygen species formation. In this study, methyl ester of aminolevulinic acid (MALA) gold nanoparticles (MALA:AuNPs) functionalized with polyethylene glycol (PEG) were synthesized by photoreduction and characterized by ultraviolet/visible optical absorption, zeta potential and electron microscopy. The reactive oxygen species generation induced by ultrasound irradiation of MALA:AuNPs solutions was studied by observing the decrease in the 1,3-diphenylisobenzofuran emission band...
June 20, 2018: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/29908752/impact-of-encapsulation-on-in-vitro-and-in-vivo-performance-of-volatile-nanoscale-phase-shift-perfluorocarbon-droplets
#13
Kimoon Yoo, Wesley R Walker, Ross Williams, Charles Tremblay-Darveau, Peter N Burns, Paul S Sheeran
Phase-shift droplets can be converted by sound from low-echogenicity, liquid-core agents into highly echogenic microbubbles. Many proposed applications in imaging and therapy take advantage of the high spatiotemporal control over this dynamic transition. Although some studies have reported increased circulation time of the droplets compared with microbubbles, few have directly explored the impact of encapsulation on droplet performance. With the goal of developing nanoscale droplets with increased circulatory persistence, we first evaluate the half-life of several candidate phospholipid encapsulations in vitro at clinical frequencies...
June 13, 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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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