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ultrasound AND contrast media

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https://www.readbyqxmd.com/read/29158937/connatal-urinary-ascites-in-a-female-preterm
#1
Barbara Brunner, Elisabeth Ralser, Elisabeth D'Costa, Kathrin Maurer, Ursula Kiechl-Kohlendorfer, Elke Griesmaier
Background: Connatal urinary ascites is rare in females without associated malformations and occurs following bladder rupture. Case Presentation: A female very preterm was delivered by caesarean section because of abnormal Doppler findings. The mother suffered from viral pneumonia requiring intensive care in the third trimester of pregnancy. Serial fetal ultrasound examinations showed a megacystis and ascites. Postnatally, pronounced isolated ascites was drained and its urinary nature was confirmed...
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/29153371/liver-metastases-detection-and-staging
#2
REVIEW
Therese Lincke, Christoph J Zech
The liver is more often involved with metastatic disease than primary liver tumors. The accurate detection and characterization of liver metastases are crucial since patient management depends on it. The imaging options, mainly consisting of contrast-enhanced ultrasound (CEUS), multidetector computed tomography (CT), magnetic resonance imaging (MRI) with diffusion-weighted imaging (DWI), extra-cellular contrast media and liver-specific contrast media as well as positron emission tomography/computed tomography (PET/CT), are constantly evolving...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29151981/cellular-uptake-of-plain-and-spion-modified-microbubbles-for-potential-use-in-molecular-imaging
#3
Mona Ahmed, Barbara Cerroni, Anton Razuvaev, Johan Härmark, Gaio Paradossi, Kenneth Caidahl, Björn Gustafsson
Introduction: Both diagnostic ultrasound (US) and magnetic resonance imaging (MRI) accuracy can be improved by using contrast enhancement. For US gas-filled microbubbles (MBs) or silica nanoparticles (SiNPs), and for MRI superparamagnetic or paramagnetic agents, contribute to this. However, interactions of MBs with the vascular wall and cells are not fully known for all contrast media. Methods: We studied the in vitro interactions between three types of non-targeted air-filled MBs with a polyvinyl-alcohol shell and murine macrophages or endothelial cells...
2017: Cellular and Molecular Bioengineering
https://www.readbyqxmd.com/read/29108077/characterization-of-focal-liver-lesions-using-ceus-and-mri-with-liver-specific-contrast-media-experience-of-a-single-radiologic-center
#4
Lukas Philipp Beyer, Florian Wassermann, Benedikt Pregler, Katharina Michalik, Janine Rennert, Isabel Wiesinger, Christian Stroszczynski, Philipp Wiggermann, Ernst Michael Jung
Aim The purpose of this study was to compare contrast-enhanced ultrasound (CEUS), magnetic resonance imaging (MRI) using liver-specific contrast agent and a combination of both for the characterization of focal liver lesions (FLL). Methods 83 patients with both benign and malignant liver lesions were examined using CEUS and MRI after the intravenous administration of liver-specific contrast media. All patients had inconclusive results from prior imaging examinations. Histopathological specimens could be obtained in 53 patients...
November 6, 2017: Ultraschall in der Medizin
https://www.readbyqxmd.com/read/29069539/low-intensity-pulsed-ultrasound-stimulation-for-mandibular-condyle-osteoarthritis-lesions-in-rats
#5
Akemi Kanaguchi Arita, Ikuo Yonemitsu, Yuhei Ikeda, Mutsumi Miyazaki, Takashi Ono
OBJECTIVE: This study evaluated low-intensity pulsed ultrasound effects for temporomandibular joint osteoarthritis in adult rats. MATERIAL AND METHODS: Osteoarthritis-like lesions were induced in 24 adult rats' temporomandibular joints with low-dose mono-iodoacetate injections. The rats were divided into four groups: control and mono-iodoacetate groups, injected with contrast media and mono-iodoacetate, respectively, at 12 weeks and observed until 20 weeks; and low-intensity pulsed ultrasound and mono-iodoacetate + low-intensity pulsed ultrasound groups, injected with contrast media and mono-iodoacetate, respectively, at 12 weeks with low-intensity pulsed ultrasound performed from 16-20 weeks...
October 25, 2017: Oral Diseases
https://www.readbyqxmd.com/read/29030579/effect-of-iodinated-contrast-media-on-renal-perfusion-a-randomized-comparison-study-in-pigs-using-quantitative-contrast-enhanced-ultrasound-ceus
#6
Philipp Lamby, Friedrich Jung, Stefanie Graf, Lotte Schellenberg, Johannes Falter, Natascha Platz-da-Silva, Stephan Schreml, Lukas Prantl, Ralf P Franke, Ernst M Jung
The administration of iodinated contrast media (CM) can cause microcirculatory disorder leading to acute renal dysfunction. In a prospective, randomized investigation two CM (Iodixanol vs Iopromide) were compared in 16 pigs. Each animal received 10 intra-aortal injections (5 ml Iodixanol or 4.32 ml Iopromide). Microcirculation was assessed using contrast-enhanced ultrasound (CEUS) directly on the kidney surface using time-to-peak (TTP) and blood-volume-analysis. Macroscopic observations were documented...
October 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28964468/safety-of-contrast-material-use-during-pregnancy-and-lactation
#7
REVIEW
Paulo Puac, Andrés Rodríguez, Carina Vallejo, Carlos A Zamora, Mauricio Castillo
The use of contrast media to image patients who are pregnant has increased during the past decades worldwide. Their use in pregnancy and in patients who are lactating remains a challenging issue for radiologists and other physicians. This article addresses the different types of contrast media that may be used in such patients according to the imaging modality (iodinated contrast media, barium, gadolinium-based, and ultrasound contrast agents), focusing on their adverse effects, potential teratogenic effects, strategies to minimize risks, and current clinical recommendation...
November 2017: Magnetic Resonance Imaging Clinics of North America
https://www.readbyqxmd.com/read/28964089/ultrasound-propagation-through-dilute-polydisperse-microbubble-suspensions
#8
Nicholas C Ovenden, Jean-Pierre O'Brien, Eleanor Stride
In a fully nonlinear model of wave propagation through bubbly media, computational complexity arises when the medium contains a polydisperse bubble population. This is because a nonlinear ordinary differential equation governing the bubble response must be solved for the current radius of each bubble size present at every spatial location and at every time step. In biomedical ultrasound imaging, commercial contrast agents typically possess a wide range of bubble sizes that exhibit a variety of differing behaviours at ultrasound frequencies of clinical interest...
September 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28930197/red-blood-cell-eicosapentaenoic-acid-inversely-relates-to-mri-assessed-carotid-plaque-lipid-core-burden-in-elders-at-high-cardiovascular-risk
#9
Núria Bargalló, Rosa Gilabert, Edwin-Saúl Romero-Mamani, Montserrat Cofán, Philip C Calder, Montserrat Fitó, Dolores Corella, Jordi Salas-Salvadó, Miguel Ruiz-Canela, Ramon Estruch, Emilio Ros, Aleix Sala-Vila
Supplemental marine omega-3 eicosapentaenoic acid (EPA) has an anti-atherosclerotic effect. Clinical research on EPA supplied by the regular diet and atherosclerosis is scarce. In the framework of the PREvención con DIeta MEDiterránea (PREDIMED) trial, we conducted a cross-sectional study in 161 older individuals at high vascular risk grouped into different stages of carotid atherosclerosis severity, including those without ultrasound-detected atheroma plaque (n = 38), with plaques <2.0 mm thick (n = 65), and with plaques ≥2...
September 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28700167/-relevance-of-contrast-ultrasound-with-microbubbles-in-vascular-medecine
#10
Andreas Erdmann, Barbara Ney, Adriano Alatri, Luca Calanca, Lucia Mazzolai
Application of ultrasound contrast media has become a standard in diagnostic imaging in cardiology and in the characterization of focal lesions in multiple organs, especially of the liver. In the past years there was a growing body of evidence for their usefulness in vascular medicine. The development of contrast media, microbubbles with a stabilizing envelope and filled with gaz, small enough to pass through pulmonary capillaries made real-time imaging of organ perfusion possible. Ultrasound contrast media are rapidly eliminated by exhalation and can safely be administered to patients with renal failure...
December 7, 2016: Revue Médicale Suisse
https://www.readbyqxmd.com/read/28692762/nanoscale-ultrasound-switchable-fret-based-liposomes-for-near-infrared-fluorescence-imaging-in-optically-turbid-media
#11
Qimei Zhang, Stephen P Morgan, Melissa L Mather
A new approach for fluorescence imaging in optically turbid media centered on the use of nanoscale ultrasound-switchable FRET-based liposome contrast agents is reported. Liposomes containing lipophilic carbocyanine dyes as FRET pairs with emission wavelengths located in the near-infrared window are prepared. The efficacy of FRET and self-quenching for liposomes with a range of fluorophore concentrations is first calculated from measurement of the liposome emission spectra. Exposure of the liposomes to ultrasound results in changes in the detected fluorescent signal, the nature of which depends on the fluorophores used, detection wavelength, and the fluorophore concentration...
July 10, 2017: Small
https://www.readbyqxmd.com/read/28683759/intravenous-neutralization-of-vascular-endothelial-growth-factor-reduces-vascular-function-permeability-of-the-ovary-and-prevents-development-of-ohss-like-symptoms-in-rhesus-monkeys
#12
C V Bishop, D M Lee, O D Slayden, X Li
BACKGROUND: Ovarian hyperstimulation syndrome (OHSS) is a disorder associated with elevated serum VEGFA following chorionic gonadotropin (hCG) exposure in controlled ovarian stimulation (COS) cycles in women. In this study, we tested the effect of intravenous VEGFA neutralization on OHSS-like symptoms and vascular function in rhesus macaques during COS cycles. METHODS: Monkeys (n = 8) were treated with 3 COS protocols and assigned randomly to groups as follows: 1) COS alone (Control, n = 5); 2) COS + VEGF mAb Avastin 19 ± 5 h before hCG (Avastin pre-hCG; n = 6); 3) COS + Avastin 3-4 days post-hCG (Avastin post-hCG; n = 4); 4) COS + Simulated Early Pregnancy (SEP n = 3); or 5) COS + SEP + Avastin (SEP + Avastin n = 3)...
July 6, 2017: Journal of Ovarian Research
https://www.readbyqxmd.com/read/28655388/ultrasound-guided-percutaneous-endovascular-treatment-of-arteriovenous-fistula-graft
#13
Boštjan Leskovar, Tjaša Furlan, Simona Poznič, Maja Potisek, Anton Adamlje, Tomaž Ključevšek
BACKGROUND: Ultrasound-guided percutaneous endovascular treatment of arteriovenous fistula (AVF) or graft failure is an alternative to radiologically-guided angioplastic methods. Its main advantages are that it can be used with open or percutaneous access, using no contrast media and no radiation. The aim of this study was to analyze the results of ultrasound-guided endovascular treatment of arteriovenous access failure. MATERIAL AND METHODS: Preoperative ultrasound was used to determine the degree of stenosis and the size of balloon used in angioplasty...
2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28629621/differential-effect-of-obesity-on-prevalence-of-cardiac-and-carotid-target-organ-damage-in-hypertension-the-campania-salute-network
#14
Costantino Mancusi, Eva Gerdts, Maria Angela Losi, Andrea D'Amato, Maria Virginia Manzi, Grazia Canciello, Valentina Trimarco, Nicola De Luca, Giovanni de Simone, Raffaele Izzo
BACKGROUND: Whether increasing body mass index (BMI) is independently associated with parallel increased prevalence of hypertensive vascular and cardiac target organ damage (TOD) needs further clarification. METHODS: We analyzed 8815 hypertensive patients without prevalent cardiovascular disease, participating in the Campania Salute Network, grouped into BMI classes (normal 20-24.9kg/m(2), overweight 25-29.9kg/m(2) and obese ≥30kg/m(2)). Vascular and cardiac TOD was defined as ultrasound plaque (intima-media thickness>1...
June 10, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28618826/a-marchenko-equation-for-acoustic-inverse-source-problems
#15
Joost van der Neut, Jami L Johnson, Kasper van Wijk, Satyan Singh, Evert Slob, Kees Wapenaar
From acoustics to medical imaging and seismology, one strives to make inferences about the structure of complex media from acoustic wave observations. This study proposes a solution that is derived from the multidimensional Marchenko equation, to learn about the acoustic source distribution inside a volume, given a set of observations outside the volume. Traditionally, this problem has been solved by backpropagation of the recorded signals. However, to achieve accurate results through backpropagation, a detailed model of the medium should be known and observations should be collected along a boundary that completely encloses the volume of excitation...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28616535/effect-of-intravenous-infusion-of-iodinated-contrast-media-on-the-coronary-blood-flow-in-dogs
#16
Thura T Abd, Asim I Shafique, Hayder S Yasir, Jung-Hee Seo, Richard T George, Rajat Mittal, Albert C Lardo
BACKGROUND: Coronary computed tomography angiography (CCTA) is obtained using peripheral intravenous iodinated contrast agents (ICA) injection. There is continuing attempts to derive coronary physiological information like coronary blood flow (CBF) and/or fractional flow reserve from CCTA images. However, no data is available regarding the effect of peripheral intravenous injection of ICA on CBF. METHODS: A series of 4 experiments was performed using healthy mongrel dogs...
September 2016: IJC Heart & Vasculature
https://www.readbyqxmd.com/read/28587488/running-multiple-marathons-is-not-a-risk-factor-for-premature-subclinical-vascular-impairment
#17
Axel Pressler, Christiane Suchy, Tasja Friedrichs, Sophia Dallinger, Viola Grabs, Bernhard Haller, Martin Halle, Johannes Scherr
Background In contrast to the well-accepted benefits of moderate exercise, recent research has suggested potential deleterious effects of repeated marathon running on the cardiovascular system. We thus performed a comprehensive analysis of markers of subclinical vascular damage in a cohort of runners having finished multiple marathon races successfully. Design This was a prospective, observational study. Methods A total of 97 healthy male Munich marathon participants (mean age 44 ± 10 years) underwent detailed training history, cardiopulmonary exercise testing for assessment of peak oxygen uptake, ultrasound for assessment of intima-media-thickness as well as non-invasive assessments of ankle-brachial index, augmentation index, pulse wave velocity and reactive hyperaemia index...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28515407/comparison-of-the-outback-%C3%A2-elite-reentry-catheter-and-the-bi-directional-approach-after-failed-antegrade-approach-for-femoro-popliteal-occlusive-disease
#18
Daizo Kawasaki, Masashi Fukunaga, Tsuyoshi Nakata, Masaaki Kato, Nobukazu Ohkubo
AIM: A successful antegrade wire crossing for femoro-popliteal chronic total occlusion (FP-CTO) is still a technical challenge. We attempted to demonstrate the safety and feasibility of the OUTBACK(®) Elite reentry catheter and the bi-directional approach for failed FP-CTO cases with the antegrade approach. METHODS: Endovascular therapy for FP-CTO was performed in 219 lesions from May 2013 to December 2016 at Morinomiya Hospital. We retrospectively analyzed the data of 43 consecutive lesions which underwent endovascular therapy using the bi-directional approach with distal access and the mono-directional approach with the OUTBACK(®) Elite reentry catheter for FP-CTO lesions...
May 17, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28511219/-innovative-ultrasound-contrast-enhanced-ultrasound-of-the-kidneys
#19
Konrad Stock, Herbert Kübler, Tobias Maurer, Daniel Weiss, Hans-Peter Weskott, Uwe Heemann
Ultrasound examination of the kidneys with grey-scale imaging and colour Doppler ultrasound is the most common renal imaging modality. A few years ago, contrast-enhanced ultrasound (CEUS) emerged as a non-invasive perfusion imaging modality to evaluate the renal vessels and microvascularisation. These contrast media contain intravenous microbubbles (sulfur hexafluoride), which have no deleterious effect on renal function. Being free of iodine, they also pose no risk for the thyroid gland. CEUS of the kidneys is mainly used for the evaluation of renal cysts and the analysis of renal lesions suspicious for malignancy...
April 2017: Aktuelle Urologie
https://www.readbyqxmd.com/read/28380969/photoacoustics-and-speed-of-sound-dual-mode-imaging-with-a-long-depth-of-field-by-using-annular-ultrasound-array
#20
Qiuning Ding, Chao Tao, Xiaojun Liu
Speed-of-sound and optical absorption reflect the structure and function of tissues from different aspects. A dual-mode microscopy system based on a concentric annular ultrasound array is proposed to simultaneously acquire the long depth-of-field images of speed-of-sound and optical absorption of inhomogeneous samples. First, speed-of-sound is decoded from the signal delay between each element of the annular array. The measured speed-of-sound could not only be used as an image contrast, but also improve the resolution and accuracy of spatial location of photoacoustic image in inhomogeneous acoustic media...
March 20, 2017: Optics Express
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