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https://www.readbyqxmd.com/read/28845490/point-shear-wave-speed-measurement-in-differentiating-benign-and-malignant-focal-liver-lesions
#1
Yi Dong, Wen-Ping Wang, Yadan Xu, Jiaying Cao, Feng Mao, Cristoph F Dietrich
AIM: To investigate the value of ElastPQ measurement for differential diagnosis of benign and malignant focal liver lesions (FLLs) by using histologic results as a reference standard. MATERIAL AND METHODS: A total of 154 patients were included. ElastPQ measurement was performed for each lesion in which the shear wave speed (SWS) was measured. The difference in SWS and SWS ratio of FLL to surrounding liver were evaluated, and the cut off value was investigated...
June 26, 2017: Medical Ultrasonography
https://www.readbyqxmd.com/read/28840451/early-prediction-of-cardiac-resynchronization-therapy-response-by-non-invasive-electrocardiogram-markers
#2
Nuria Ortigosa, Víctor Pérez-Roselló, Víctor Donoso, Joaquín Osca, Luis Martínez-Dolz, Carmen Fernández, Antonio Galbis
Cardiac resynchronization therapy (CRT) is an effective treatment for those patients with severe heart failure. Regrettably, there are about one third of CRT "non-responders", i.e. patients who have undergone this form of device therapy but do not respond to it, which adversely affects the utility and cost-effectiveness of CRT. In this paper, we assess the ability of a novel surface ECG marker to predict CRT response. We performed a retrospective exploratory study of the ECG previous to CRT implantation in 43 consecutive patients with ischemic (17) or non-ischemic (26) cardiomyopathy...
August 24, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28740087/high-contrast-far-field-radiative-thermal-diode
#3
Alok Ghanekar, Gang Xiao, Yi Zheng
We propose a theoretical concept of a far-field radiative thermal rectification device that uses a phase change material to achieve a high degree of asymmetry in radiative heat transfer. The proposed device has a multilayer structure on one side and a blackbody on other side. The multilayer structure consists of transparent thin film of KBr sandwiched between a thin film of VO2 and a reflecting layer of gold. When VO2 is in its insulating phase, the structure is highly reflective due to the two transparent layers on highly reflective gold...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28678931/vascular-aging-and-arterial-stiffness
#4
Luana de Rezende Mikael, Anelise Machado Gomes de Paiva, Marco Mota Gomes, Ana Luiza Lima Sousa, Paulo César Brandão Veiga Jardim, Priscila Valverde de Oliveira Vitorino, Maicon Borges Euzébio, Wátila de Moura Sousa, Weimar Kunz Sebba Barroso
Cardiovascular diseases (CVD) account annually for almost one third of all deaths worldwide. Among the CVD, systemic arterial hypertension (SAH) is related to more than half of those outcomes. Type 2 diabetes mellitus is an independent risk factor for SAH because it causes functional and structural damage to the arterial wall, leading to stiffness. Several studies have related oxidative stress, production of free radicals, and neuroendocrine and genetic changes to the physiopathogenesis of vascular aging. Indirect ways to analyze that aging process have been widely studied, pulse wave velocity (PWV) being considered gold standard to assess arterial stiffness, because there is large epidemiological evidence of its predictive value for cardiovascular events, and it requires little technical knowledge to be performed...
June 29, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28656688/endoscopic-treatment-of-pancreatic-duct-stones-under-direct-vision-revolution-or-resignation-systematic-review
#5
REVIEW
Torsten Beyna, Horst Neuhaus, Christian Gerges
BACKGROUND AND AIM: The main treatment aim in chronic pancreatitis (CP) is symptom control and especially pain relief. Management of stone-predominant CP is challenging and requires a multidisciplinary approach. Extracorporeal shock wave lithotripsy (ESWL) has emerged as the cornerstone of non-surgical treatment as a result of disappointing results of available endoscopic treatment options during the last decades. With new developments in the field of direct peroral pancreatoscopy (POP) and intracorporeal lithotripsy, direct intraluminal treatment of main pancreatic duct (MPD) stones returns to the spotlight...
June 28, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28627523/pulse-wave-analysis-and-diabetes-mellitus-a-systematic-review
#6
Jaromira Gajdova, David Karasek, Dominika Goldmannova, Ondrej Krystynik, Jan Schovanek, Helena Vaverkova, Josef Zadrazil
Cardiovascular (CV) disease is the primary cause of death in diabetic patients and one of the explanations may be increased arterial stiffness. Arterial stiffness assessment using pulse wave analysis, is a predictive factor of CV events. The aim of this paper is to review the current knowledge of relations between diabetes mellitus and pulse wave analysis. A MEDLINE search was performed to retrieve both original and review articles addressing the relations and influences on arterial stiffness in diabetics. Pulse wave analysis is considered as a gold standard in CV risk evaluation for patients at risk, especially diabetics...
June 5, 2017: Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia
https://www.readbyqxmd.com/read/28587153/nanoporous-gold-films-prepared-by-a-combination-of-sputtering-and-dealloying-for-trace-detection-of-benzo-a-pyrene-based-on-surface-plasmon-resonance-spectroscopy
#7
Li Wang, Xiu-Mei Wan, Ran Gao, Dan-Feng Lu, Zhi-Mei Qi
A wavelength-interrogated surface plasmon resonance (SPR) sensor based on a nanoporous gold (NPG) film has been fabricated for the sensitive detection of trace quantities of benzo[a]pyrene (BaP) in water. The large-area uniform NPG film was prepared by a two-step process that includes sputtering deposition of a 60-nm-thick AuAg alloy film on a glass substrate and chemical dealloying of the alloy film in nitric acid. For SPR sensor applications, the NPG film plays the dual roles of analyte enrichment and supporting surface plasmon waves, which leads to sensitivity enhancement...
June 1, 2017: Sensors
https://www.readbyqxmd.com/read/28567021/assessment-of-fetal-development-using-cardiac-valve-intervals
#8
Faezeh Marzbanrad, Ahsan H Khandoker, Yoshitaka Kimura, Marimuthu Palaniswami, Gari D Clifford
An automated method to assess the fetal physiological development is introduced which uses the component intervals between fetal cardiac valve timings and the Q-wave of fetal electrocardiogram (fECG). These intervals were estimated automatically from one-dimensional Doppler Ultrasound and noninvasive fECG. We hypothesize that the fetal growth can be estimated by the cardiac valve intervals. This hypothesis was evaluated by modeling the fetal development using the cardiac intervals and validating against the gold standard gestational age identified by Crown-Rump Length (CRL)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28545406/deterministic-compressive-sampling-for-high-quality-image-reconstruction-of-ultrasound-tomography
#9
Tran Quang Huy, Huynh Huu Tue, Ton That Long, Tran Duc-Tan
BACKGROUND: A well-known diagnostic imaging modality, termed ultrasound tomography, was quickly developed for the detection of very small tumors whose sizes are smaller than the wavelength of the incident pressure wave without ionizing radiation, compared to the current gold-standard X-ray mammography. Based on inverse scattering technique, ultrasound tomography uses some material properties such as sound contrast or attenuation to detect small targets. The Distorted Born Iterative Method (DBIM) based on first-order Born approximation is an efficient diffraction tomography approach...
May 25, 2017: BMC Medical Imaging
https://www.readbyqxmd.com/read/28404989/gyrator-based-on-magneto-elastic-coupling-at-a-ferromagnetic-piezoelectric-interface
#10
Swapnil Bhuktare, Arnab Bose, Hanuman Singh, Ashwin A Tulapurkar
A gyrator is a non-reciprocal two port device with 180° phase shift in the transmissions between two ports. Though electromagnetic realizations of gyrators have been well studied, devices based on other forms of interaction are relatively unexplored. Here we demonstrate a device in which signal is transmitted via magneto-elastic coupling, can function as a gyrator. The device is built on a piezoelectric substrate: one port of this device has interdigital transducers (IDTs) and the other port has a periodic array of nickel/gold lines...
April 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28387326/demonstration-of-a-three-dimensional-negative-index-medium-operated-at-multiple-angle-incidences-by-monolithic-metallic-hemispherical-shells
#11
Ting-Tso Yeh, Tsung-Yu Huang, Takuo Tanaka, Ta-Jen Yen
We design and construct a three-dimensional (3D) negative index medium (NIM) composed of gold hemispherical shells to supplant an integration of a split-ring resonator and a discrete plasmonic wire for both negative permeability and permittivity at THz gap. With the proposed highly symmetric gold hemispherical shells, the negative index is preserved at multiple incident angles ranging from 0° to 85° for both TE and TM waves, which is further evidenced by negative phase flows in animated field distributions and outweighs conventional fishnet structures with operating frequency shifts when varying incident angles...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28319298/diversity-in-gold-finger-structure-elucidated-by-traveling-wave-ion-mobility-mass-spectrometry
#12
Zhifeng Du, Raphael E F de Paiva, Kristina Nelson, Nicholas P Farrell
Traveling wave ion mobility (TWIM) mass spectrometry (MS) is a powerful method for the structural and conformational analysis of proteins and peptides, enabling the differentiation of isomeric peptides (or proteins) that have the same sequence but are modified at different residues. In this study, the TWIM-MS technique was used to separate isomeric Au(I) metallopeptide ions that were formed by Zn(II) displacement from the parent zinc fingers (ZFs). The synthetic gold finger peptides were derived from the C-terminus of the HIV nucleocapsid p7 protein (NCp7-F2) and finger 3 of the Sp1 transcription factor (Sp1-F3)...
March 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28286365/auditory-brainstem-and-middle-latency-responses-measured-pre-and-posttreatment-for-hyperacusic-hearing-impaired-persons-successfully-treated-to-improve-sound-tolerance-and-to-expand-the-dynamic-range-for-loudness-case-evidence
#13
REVIEW
Craig Formby, Peggy Korczak, LaGuinn P Sherlock, Monica L Hawley, Susan Gold
In this report of three cases, we consider electrophysiologic measures from three hyperacusic hearing-impaired individuals who, prior to treatment to expand their dynamic ranges for loudness, were problematic hearing aid candidates because of their diminished sound tolerance and reduced dynamic ranges. Two of these individuals were treated with structured counseling combined with low-level broadband sound therapy from bilateral sound generators and the third case received structured counseling in combination with a short-acting placebo sound therapy...
February 2017: Seminars in Hearing
https://www.readbyqxmd.com/read/28248655/4d-in-vivo-ultrafast-ultrasound-imaging-using-a-row-column-addressed-matrix-and-coherently-compounded-orthogonal-plane-waves
#14
M Flesch, M Pernot, J Provost, G Ferin, A Nguyen-Dinh, M Tanter, T Deffieux
4D ultrafast ultrasound imaging was recently shown using a 2D matrix (i.e. fully populated) connected to a 1024-channel ultrafast ultrasound scanner. In this study, we investigate the row-column addressing (RCA) matrix approach, which allows a reduction of independent channels from N  ×  N to N  +  N, with a dedicated beamforming strategy for ultrafast ultrasound imaging based on the coherent compounding of orthogonal plane wave (OPW). OPW is based on coherent compounding of plane wave transmissions in one direction with receive beamforming along the orthogonal direction and its orthogonal companion sequence...
March 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28211807/two-dimensional-shear-wave-elastography-of-breast-lesions-comparison-of-two-different-systems
#15
Wei-Wei Ren, Xiao-Long Li, Ya-Ping He, Dan-Dan Li, Dan Wang, Chong-Ke Zhao, Xiao-Wan Bo, Bo-Ji Liu, Wen-Wen Yue, Hui-Xiong Xu
OBJECTIVE: To evaluate the diagnostic performance of two different shear wave elastography (SWE) techniques in distinguishing malignant breast lesions from benign ones. MATERIALS AND METHODS: From March 2016 to May 2016, a total of 153 breast lesions (mean diameter, 16.8 mm±10.5; range 4.1-90.0 mm) in 153 patients (mean age, 46.4 years±15.1; age range 20-86 years) were separately performed by two different SWE techniques (i.e. T-SWE, Aplio500, Toshiba Medical System, Tochigi, Japan; and S-SWE, the Aixplorer US system, SuperSonic Imagine, Provence, France)...
2017: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/28208346/density-of-states-from-mode-expansion-of-the-self-dynamic-structure-factor-of-a-liquid-metal
#16
E Guarini, S Bellissima, U Bafile, E Farhi, A De Francesco, F Formisano, F Barocchi
We show that by exploiting multi-Lorentzian fits of the self-dynamic structure factor at various wave vectors it is possible to carefully perform the Q→0 extrapolation required to determine the spectrum Z(ω) of the velocity autocorrelation function of a liquid. The smooth Q dependence of the fit parameters makes their extrapolation to Q=0 a simple procedure from which Z(ω) becomes computable, with the great advantage of solving the problems related to resolution broadening of either experimental or simulated self-spectra...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28192918/monitoring-gold-nanoparticle-growth-in-situ-via-the-acoustic-vibrations-probed-by-four-wave-mixing
#17
Jian Wu, Dao Xiang, Reuven Gordon
We monitor in situ gold nanoparticle growth in aqueous solution by probing the acoustic vibrations with four-wave mixing. We observe two acoustic vibrational modes of gold nanoparticles from the nonlinear optical response: an extensional mode with longitudinal expansion and transverse contraction and a breathing mode with radial expansion and contraction. The mode frequencies, which show an inverse dependence on the nanoparticle diameter, allow one to monitor the nanoparticle size and size distribution during synthesis...
January 30, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28122250/synthesis-spectral-characterization-crystal-structure-cytotoxicity-and-apoptosis-inducing-activity-of-two-derivatives-of-2-hydroxy-1-4-naphthaquinone
#18
Kavitha Rani P R, Annette Fernandez, Shiny P Laila, Arunkumar B, Sreelakshmi C S, Vishnu V S
A phenaxazone compound [5H-Benzo[a]phenoxazin-5-one (BP)]along with an aminoquinone[2-[(o-hydroxyphenyl)amino]-1,4-naphthaquinone (HAN)] derivatives were synthesized from lawsone using ultrasound irradiation technique. The structure of the compounds were characterized by elemental analysis and various spectral studies. Optoelectronic properties were studied using Schrodinger material science suit (2015). The compounds exhibit fluorescence emission in longer wave length it may find applications in photodynamic therapy...
January 22, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28114757/understanding-resonant-light-triggered-dna-release-from-plasmonic-nanoparticles
#19
Amanda M Goodman, Nathaniel J Hogan, Samuel Gottheim, Carrie Li, Susan E Clare, Naomi J Halas
Nanoparticle-based platforms for gene therapy and drug delivery are gaining popularity for cancer treatment. To improve therapeutic selectivity, one important strategy is to remotely trigger the release of a therapeutic cargo from a specially designed gene- or drug-laden near-infrared (NIR) absorbing gold nanoparticle complex with NIR light. While there have been multiple demonstrations of NIR nanoparticle-based release platforms, our understanding of how light-triggered release works in such complexes is still limited...
January 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28113242/a-novel-method-for-continuous-noninvasive-cuff-less-measurement-of-blood-pressure-evaluation-in-patients-with-nonalcoholic-fatty-liver-disease
#20
Trine M Seeberg, James G Orr, Hanne Opsahl, H O Austad, Morten H Roed, Steffen H Dalgard, David Houghton, David E J Jones, Frode Strisland
OBJECTIVE: One promising approach for a continuous, noninvasive, cuff-less ambulatory blood pressure (BP) monitor is to measure the pulse wave velocity or the inversely proportional pulse transit time (PTT), based on electrical and optical physiological measurements in the chest area. A device termed IsenseU-BP+ has been developed for measuring continuous BP, as well as other physiological data. The objective of this paper is to present results from the first clinical evaluation with a wide range of patients...
July 2017: IEEE Transactions on Bio-medical Engineering
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