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low frequency ultrasound

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https://www.readbyqxmd.com/read/28227421/spectral-based-pneumonia-detection-tool-using-ultrasound-data-from-pediatric-populations
#1
O Zenteno, B Castaneda, R Lavarello, O Zenteno, B Castaneda, R Lavarello, B Castaneda, O Zenteno, R Lavarello
Pediatric Pneumonia is one of the principal causes of death by year on children under the age of five worldwide. The diagnosis is commonly made by clinical criteria with support from imaging tools like radiography. Lung ultrasound has been considered a low-cost and portable alternative for pneumonia imaging; however, interpretation is subjective and requires adequate training. In the present work, a pneumonia detection algorithm based on the measurement of the fundamental bandwidth downshift over depth of ultrasound radiofrequency (RF) signals is presented...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227205/low-frequency-ultrasound-radiosensitization-and-therapy-response-monitoring-of-tumors-an-in-vivo-study
#2
Ali Sadeghi-Naini, Martin Stanisz, Hadi Tadayyon, Jaswinder Taank, Gregory J Czarnota, Ali Sadeghi-Naini, Martin Stanisz, Hadi Tadayyon, Jaswinder Taank, Gregory J Czarnota, Jaswinder Taank, Hadi Tadayyon, Martin Stanisz, Ali Sadeghi-Naini, Gregory J Czarnota
A new framework has been introduced in this paper for tumor radiosensitization and therapy response monitoring using low-frequency ultrasound. Human fibrosarcoma xenografts grown in severe combined immunodeficiency (SCID) mice (n = 108) were treated using ultrasound-stimulated microbubbles at various concentration and exposed to different doses of radiation. Low-frequency ultrasound radiofrequency (RF) data were acquired from tumors prior to and at different times after treatment. Quantitative ultrasound (QUS) techniques were applied to generate spectral parametric maps of tumors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28212081/a-comparative-analysis-of-cmut-receiving-architectures-for-design-optimization-of-integrated-transceiver-front-ends
#3
Marco Sautto, Alessandro Stuart Savoia, Fabio Quaglia, Giosue Caliano, Andrea Mazzanti
A formal comparison between fundamental RX amplifier configurations for Capacitive Micromachined Ultrasonic Transducers (CMUT) is proposed in this paper. The impact on both RX and the pulse-echo frequency response and on the output SNR are thoroughly analysed and discussed. It is shown that the resistive-feedback amplifier yields a band-pass RX frequency response, while both open-loop voltage and capacitivefeedback amplifiers exhibit a low-pass frequency response. For a given power dissipation, it is formally proved that a capacitivefeedback amplifier provides a remarkable SNR improvement against the commonly adopted resistive feedback stage, achieved at the expense of a reduced pulse-echo center frequency, making its use convenient in low and mid-frequency ultrasound imaging applications...
February 13, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28210025/vascular-lipoleiomyoma-of-the-uterus-an-unusual-case
#4
Vesna Chibisheva, Vesna Antovska, Milka Trajanova, Drage Dabeski, Rubens Jovanovic, Ivana Kijajova
INTRODUCTION: Uterine lipoleiomyomas are a rare type of uterine myomas, which have been seldom diagnosed and are less known and still unusual. Histologically they are composed of smooth muscle cells with multiple fat cells and fibrous tissue. Their pathogenesis is still a stigmata and their preoperative diagnosis is still questionable. CASE REPORT HISTORY: A 39-year old woman presented at the University clinic for obstetrics and gynecology with complaints of a mild low abdominal and pelvic pain, increased frequency of vaginal bleeding and abdominal distension...
December 2016: Medical Archives
https://www.readbyqxmd.com/read/28209579/patterns-of-brain-injury-in-newborns-treated-with-extracorporeal-membrane-oxygenation
#5
M A Wien, M T Whitehead, D Bulas, M Ridore, L Melbourne, G Oldenburg, B L Short, A N Massaro
BACKGROUND AND PURPOSE: Neonates treated with extracorporeal membrane oxygenation are at risk for brain injury and subsequent neurodevelopmental compromise. Advances in MR imaging and improved accessibility have led to the increased use of routine MR imaging after extracorporeal membrane oxygenation. Our objective was to describe the frequency and patterns of extracorporeal membrane oxygenation-related brain injury based on MR imaging findings in a large contemporary cohort of neonates treated with extracorporeal membrane oxygenation...
February 16, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28196770/effect-of-low-intensity-cavitation-on-the-isolated-human-thoracic-artery-in%C3%A2-vitro
#6
Algimantas Bubulis, Vida Garalienė, Vytautas Jurėnas, Jonas Navickas, Saulius Giedraitis
Reported here are the results of an experimental study on the response to low-intensity cavitation induced by low-frequency (4-6 W/cm(2), 20 kHz and 32.6 kHz) ultrasound of isolated human arterial samples taken during conventional myocardial revascularization operations. Studies have found that low-frequency ultrasound results in a significant (48%-54%) increase in isometric contraction force and does not depend on the number of exposures (10 or 20) or the time passed since the start of ultrasound (0, 10 and 20 min), but does depend on the frequency and location (internal or external) of the blood vessels for the application of ultrasound...
February 10, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28191535/association-of-serum-intact-fibroblast-growth-factor-23-with-left-ventricular-mass-and-different-echocardiographic-findings-in-patients-on-hemodialysis
#7
Amir Ahmad Nassiri, Monir Sadat Hakemi, Reza Safar-Pour, Ali Ahmadi, Maryam Tohidi, Babak Sharif Kashani, Fatemeh Esfehani, Soudabeh Alatab
OBJECTIVES: To determine the association of fibroblast growth factor 23 (FGF23) with left ventricular hypertrophy (LVH) through the assessment of left ventricular (LV) mass and left ventricular mass index (LVMI) in patients on hemodialysis, this study was done. METHODS: All patients on hemodialysis who are older than 18 years and in whom hemodialysis vintage was at least 6 months were enrolled. All patients were on hemodialysis thrice a week for 4 h using low-flux dialysis filters, polysulfone membranes, reverse osmosis purified water, and bicarbonate-base hemodialysis solution...
September 1, 2016: Journal of Translational Internal Medicine
https://www.readbyqxmd.com/read/28188834/amelioration-of-cerebellar-dysfunction-in-rats-following-postnatal-ethanol-exposure-using-low-intensity-pulsed-ultrasound
#8
Hiva Mohammadi Bolbanabad, Enayat Anvari, Mohammad Jafar Rezai, Ardashir Moayeri, Mohammad Reza Kaffashian
BACKGROUND: The neonatal development stage of the cerebellum in rats is equivalent to a human foetus in the third trimester of pregnancy. In this stage, cell proliferation, migration, differentiation, and synaptogenesis occur. Clinical and experimental findings have shown that ethanol exposure during brain development causes a variety of disruptions to the brain, including neurogenesis depression, delayed neuronal migration, changes in neurotransmitter synthesis, and neuronal depletion...
February 7, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28184253/concordance-between-the-tirads-ultrasound-criteria-and-the-bethesda-cytology-criteria-on-the-nontoxic-thyroid-nodule
#9
Hernando Vargas-Uricoechea, Ivonne Meza-Cabrera, Jorge Herrera-Chaparro
BACKGROUND: Thyroid nodule is a common disorder of the thyroid. Despite their benign nature, they can be associated with multiple pathologic conditions, including thyroid cancer. METHODS: This cross-sectional study determined the concordance of Ultrasound (TIRADS criteria) and Fine Needle Aspiration Biopsy (FNA-BETHESDA system) in the assessment of the nontoxic thyroid nodule. A total of 180 subjects 18 years old or older underwent the two diagnostic tests and their results were compared using kappa index...
2017: Thyroid Research
https://www.readbyqxmd.com/read/28183068/electroless-deposition-of-nickel-boron-coatings-using-low-frequency-ultrasonic-agitation-effect-of-ultrasonic-frequency-on-the-coatings
#10
L Bonin, N Bains, V Vitry, A J Cobley
The effect of ultrasound on the properties of Nickel-Boron (NiB) coatings was investigated. NiB coatings were fabricated by electroless deposition using either ultrasonic or mechanical agitation. The deposition of Ni occurred in an aqueous bath containing a reducible metal salt (nickel chloride), reducing agent (sodium borohydride), complexing agent (ethylenediamine) and stabilizer (lead tungstate). Due to the instability of the borohydride in acidic, neutral and slightly alkaline media, pH was controlled at pH 12±1 in order to avoid destabilizing the bath...
January 30, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28182095/early-detection-of-tibial-cartilage-degradation-and-cancellous-bone-loss-in-an-ovariectomized-rat-model
#11
Yinong Wang, Zhiwei Liu, Qing Wang, Qianjin Feng, Wufan Chen
This study aimed to investigate degradation of the articular cartilage and loss of the cancellous bone in an ovariectomized (OVX) rat model simulating early human menopausal stage. Fourteen health female Sprague-Dawley rats were randomly divided into two groups (n = 7 per group): an OVX group that underwent bilateral ovariectomy to create an OVX model with low estrogen levels and a sham group in which only the periovarian fatty tissue was exteriorized. All the animals were sacrificed at 3 weeks after ovariectomy...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28170150/double-strand-breaks-in-a-genome-sized-dna-caused-by-ultrasound-high-frequency-pulsing-induces-greater-damage-than-cw-sonication-and-low-frequency-pulsing-causes-less-damage
#12
Takahiro Kenmotsu, Rinko Kubota, Yusuke Yamashita, Yuko Yoshikawa, Kenji Yoshida, Yoshiaki Watanabe, Tadayuki Imanaka, Kenichi Yoshikawa
DNA double-strand breaks (DSBs) caused by ultrasound were evaluated in a quantitative manner through the use of single-molecule observation with fluorescence microscopy. We compared the effect of time-interval, or pulse, sonication to that of continuous wave (CW) sonication at a fixed frequency of 30 kHz. Pulses caused fewer DSBs than CW sonication, under the same total input energy of ultrasound, when the pulse repetition period was above the order of a second(s). In contrast, pulses caused more DSBs than CW sonication for a pulse width shorter than a second(s)...
February 7, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28169315/ultrasound-mediated-mesenchymal-stem-cells-transfection-as-a-targeted-cancer-therapy-platform
#13
Tom Haber, Limor Baruch, Marcelle Machluf
Mesenchymal stem cells (MSCs) hold tremendous potential as a targeted cell-based delivery platform for inflammatory and cancer therapy. Genetic manipulation of MSCs, however, is challenging, and therefore, most studies using MSCs as therapeutic cell carriers have utilized viral vectors to transduce the cells. Here, we demonstrate, for the first time, an alternative approach for the efficient transfection of MSCs; therapeutic ultrasound (TUS). Using TUS with low intensities and moderate frequencies, MSCs were transfected with a pDNA encoding for PEX, a protein that inhibits tumor angiogenesis, and studied as a cell vehicle for in vivo tumor therapy...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167464/high-frequency-ultrasound-features-and-pathological-characteristics-of-medullary-thyroid-carcinoma
#14
Hua Wang, Mengmeng Liu, Jianqiu Yang, Yimin Song
To study high-frequency ultrasound features and pathological characteristics of medullary thyroid carcinoma (medullary thyroid carcinoma, MTC) with the purpose to improve the diagnostic accuracy of this disease. The clinical data of 20 cases of patients with MTC confirmed by the clinical surgery were retrospectively analyzed. And the high-frequency ultrasound features were analyzed and compared with the pathological characteristics. There were 16 cases with tumor invasion into one side of the thyroid gland; 17 cases with tumor in the middle-upper pole of the thyroid gland...
November 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28163223/influence-of-peptide-dendrimers-and-sonophoresis-on-the-transdermal-delivery-of-ketoprofen
#15
Jyothsna Manikkath, Aswathi R Hegde, Guruprasad Kalthur, Harendra S Parekh, Srinivas Mutalik
The aim of this study was to determine the individual and combined effects of peptide dendrimers and low frequency ultrasound on the transdermal permeation of ketoprofen. Arginine terminated peptide dendrimers of varying charges (4(+), 8(+) and 16(+), named as A4. A8 and A16 respectively) were synthesized and characterized. Ketoprofen was subjected to passive, peptide dendrimer-assisted and sonophoretic permeation studies (with and without dendrimer application) across Swiss albino mouse skin, both in vitro and in vivo...
February 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28127790/size-of-sclerosing-foams-prepared-by-ultrasound-mechanical-agitation-and-the-handmade-tessari-method-for-treatment-of-varicose-veins
#16
Costantino Davide Critello, Antonino S Fiorillo, Thomas J Matula
OBJECTIVES: Sclerotherapy is a therapeutic method used in the treatment of varicose veins and works by occluding damaged blood vessels with a chemical solution. Foam sclerotherapy is an attractive treatment because the results are more effective than those obtained by using liquid sclerosants. However, serious neurologic complications, which are likely related to air embolism, have been reported after treatment with foams generated by the handmade method (Tessari technique) most often used clinically...
January 27, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/28114123/terahertz-lattice-dynamics-of-the-potassium-rare-earth-binary-molybdates
#17
S Poperezhai, P Gogoi, N Zubenko, K Kutko, V I Kutko, A S Kovalev, D Kamenskyi
We report a systematic study of low-energy lattice vibrations in the layered systems KY(MoO4)2, KDy(MoO4)2, KEr(MoO4)2, and KTm(MoO4)2. A layered crystal structure and low symmetry of the local environment of the rare-earth ion cause the appearance of vibrational and electronic excitations in Terahertz frequencies. The interaction between these excitations leads to sophisticated dynamical properties, including non-linear effects in paramagnetic resonance spectra. The THz study in magnetic field allows for the clear distinction between lattice vibrations and electronic excitations...
March 8, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28113748/multifrequency-interlaced-cmuts-for-photoacoustic-imaging
#18
Ryan K W Chee, Peiyu Zhang, Mohammad Maadi, Roger J Zemp
Multifrequency capacitive micromachined ultrasound transducers (CMUTs) are introduced consisting of interlaced 82- [Formula: see text] (low frequency) and 36- [Formula: see text] (high frequency) membranes. The membranes have been interlaced on a scale smaller than the shortest wavelength of operation allowing several advantages over other multifrequency transducer designs including aligned beam profiles, optimal imaging resolution, and minimal grating lobes. The low- and high-frequency CMUTs operate at 1.74 and 5...
February 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113418/high-frame-rate-synthetic-aperture-ultrasound-imaging-using-mismatched-coded-excitation-waveform-engineering-a-feasibility-study
#19
Bahman Lashkari, Kaicheng Zhang, Andreas Mandelis
Mismatched coded excitation can be employed to increase the frame rate of synthetic aperture ultrasound imaging. The high auto-correlation and low cross-correlation of the transmitted signals enables the identification and separation of the signal sources at the receiver. Thus, the method provides B-mode imaging with simultaneous transmission from several elements and capability of spatial decoding of the transmitted signals which makes the imaging process equivalent to consecutive transmissions. Each transmission generates its own image and the combination of all the images results in a image with a high lateral resolution...
April 14, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113368/a-comparison-between-compounding-techniques-using-large-beam-steered-plane-wave-imaging-for-blood-vector-velocity-imaging-in-a-carotid-artery-model
#20
Anne Saris, Hendrik Hansen, Stein Fekkes, Maartje Nillesen, Marcel Rutten, Chris de Korte
Conventional color Doppler imaging is limited, since it only provides velocity estimates along the ultrasound beam direction for a restricted field of view at a limited frame rate. High frame rate speckle tracking, using plane wave transmits, has shown potential for 2D blood velocity estimation. However, due to the lack of focusing in transmit, image quality gets reduced, which hampers speckle tracking. Although ultrafast imaging facilitates improved clutter filtering, it still remains a major challenge in blood velocity estimation...
September 7, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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