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https://www.readbyqxmd.com/read/28095079/the-use-of-ultrasound-in-the-study-of-articulatory-properties-of-vowels-in-clear-speech
#1
Jae Yung Song
Although the acoustic properties of clear speech have been extensively studied, its underlying articulatory details have not been well understood. The purpose of the present study is twofold: To examine the specific articulatory processes of clear speech using ultrasound and to investigate whether and how the type of listener (hard of hearing, normal hearing) and the lexical property of words (frequency) interact in the production of clear speech. To this end, we examined productions of /ɑ/, /æ/ and /u/ from 16 speakers of US English...
January 17, 2017: Clinical Linguistics & Phonetics
https://www.readbyqxmd.com/read/28092533/linear-system-models-for-ultrasonic-imaging-intensity-signal-statistics
#2
Craig Abbey, Yang Zhu, Sara Bahramian, Michael Insana
Despite a great deal of work characterizing the statistical properties of radio-frequency backscattered ultrasound signals, less is known about the statistical properties of demodulated intensity signals. Analysis of intensity is made more difficult by a strong nonlinearity that arises in the process of demodulation. This limits our ability to characterize the spatial resolution and noise properties of B-mode ultrasound images. In this work, we generalize earlier results on two-point intensity covariance using a multivariate systems approach...
January 16, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092531/a-200-1380-khz-quadrifrequency-focused-ultrasound-transducer-for-neurostimulation-in-rodents-and-primates-transcranial-in-vitro-calibration-and-numerical-study-of-the-influence-of-skull-cavity
#3
Charlotte Constans, Thomas Deffieux, Pierre Pouget, Mickael Tanter, Jean-Francois Aubry
Low intensity transcranial focused ultrasound has been demonstrated to produce neuromodulation in both animals and humans. Primarily for technical reasons, frequency is one of the most poorly investigated critical wave parameters. We propose the use of a quadri-band transducer capable of operating at 200, 320, 850 and 1380 kHz for further investigation of the frequency dependence of neuromodulation efficacy while keeping the position of the transducer fixed with respect to the subject's head. This paper presents the results of the transducer calibration in water, in vitro transmission measurements through a monkey skull flap, 3D simulations based on both a μCT-scan of a rat and on CT-scans of 2 macaques...
January 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28078758/periconceptional-maternal-high-fish-and-olive-oil-low-meat-dietary-pattern-is-associated-with-increased-embryonic-growth-the-rotterdam-periconceptional-cohort-predict-study
#4
Francesca Parisi, Melek Rousian, Nicole A Huijgen, Anton H J Koning, Sten P Willemsen, Jeanne H M de Vries, Irene Cetin, Eric A P Steegers, Régine P M Steegers-Theunissen
OBJECTIVE: To investigate associations between periconceptional maternal dietary patterns and first trimester embryonic growth. METHODS: 228 women with singleton ongoing pregnancies were enrolled in a prospective periconceptional cohort study, comprising of 135 strictly dated spontaneous pregnancies and 93 pregnancies achieved after in vitro fertilization or intracytoplasmatic sperm injection (IVF/ICSI pregnancies). All women underwent longitudinal transvaginal three-dimensional ultrasound (3D-US) scans from 6(+0) up to 13(+0) weeks of gestation...
January 12, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28077820/acute-coronary-syndrome-demonstrating-plaque-rupture-in-calcified-lesions-visualized-by-optical-frequency-domain-imaging
#5
Yutaka Goryo, Teruyoshi Kume, Yusuke Kobayashi, Hiroshi Okamoto, Ai Kawamura, Kenzo Fukuhara, Terumasa Koyama, Ryotaro Yamada, Koichiro Imai, Yoji Neishi, Shiro Uemura
A 68-year-old female with acute coronary syndrome was transferred to our hospital. Emergency coronary angiography showed 90% stenosis with severe calcification in the proximal right coronary artery (RCA). Intravascular ultrasound (IVUS) images were obtained and showed circumferential heavy calcification without any evidence of plaque rupture. Optical frequency domain imaging (OFDI) images were obtained in the RCA lesion 3 days after the initial coronary angiography. A cavity of plaque rupture in the calcified plaque by using OFDI was observed in the lesion, which could not be recognized by IVUS...
January 11, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28076337/coded-excitation-for-diverging-wave-cardiac-imaging-a-feasibility-study
#6
Feifei Zhao, Ling Tong, Qiong He, Jianwen Luo
Diverging wave (DW) based cardiac imaging has gained increasing interest in recent years given its capacity to achieve ultrahigh frame rate. However, the signal-to-noise ratio (SNR), contrast, and penetration depth of the resulting B-mode images are typically low as DWs spread energy over a large region. Coded excitation is known to be capable of increasing the SNR and penetration for ultrasound imaging. The aim of this study was therefore to test the feasibility of applying coded excitation in DW imaging to improve the corresponding SNR, contrast and penetration depth...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28073049/iodine-nutritional-status-and-thyroid-effects-of-exposure-to-ethylenebisdithiocarbamates
#7
Emanuela Medda, Ferruccio Santini, Simona De Angelis, Fabrizio Franzellin, Carla Fiumalbi, Andrea Perico, Enzo Gilardi, Maria Teresa Mechi, Alessandro Marsili, Angela Citroni, Adaniele Leandri, Alberto Mantovani, Paolo Vitti, Antonella Olivieri
INTRODUCTION: Italy is still characterized by a mild iodine deficiency and is among the most intensive users of chemical products for agriculture in Europe. The aim of this study was i) to evaluate thyroid effects of exposure to mancozeb, a fungicide widely used in agriculture, in a sample of Italian grapevine workers, and ii) to verify whether the iodine intake may modulate the risk of thyroid disruption due to the mancozeb metabolite ethylenthiourea (ETU). METHODS: One hundred seventy-seven occupationally exposed male workers (29 from Chianti, a mild iodine deficient area, and 148 from Bolzano an iodine sufficient province) and 74 non-occupationally exposed male controls (34 from Chianti and 40 from Bolzano) were enrolled in the study...
January 7, 2017: Environmental Research
https://www.readbyqxmd.com/read/28069210/sonochemical-oxidation-of-vanillyl-alcohol-to-vanillin-in-the-presence-of-a-cobalt-oxide-catalyst-under-mild-conditions
#8
Ronan Behling, Gregory Chatel, Sabine Valange
The heterogeneous oxidation of vanillyl alcohol to vanillin was investigated on new grounds under eco-friendly conditions in the presence of hydrogen peroxide as an oxidant and water as solvent, coupled with low frequency ultrasonic irradiation. The sono-Fenton-like-assisted vanillyl alcohol oxidation was performed with a high-surface area nanostructured spinel cobalt oxide catalyst exhibiting small crystallites size. The catalytic reaction was also carried out under conventional heating conditions for comparison purposes...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069201/pulsed-wave-low-dose-ultrasound-hyperthermia-selectively-enhances-nanodrug-delivery-and-improves-antitumor-efficacy-for-brain-metastasis-of-breast-cancer
#9
Sheng-Kai Wu, Chi-Feng Chiang, Yu-Hone Hsu, Houng-Chi Liou, Wen-Mei Fu, Win-Li Lin
The clinical application of chemotherapeutics for brain tumors remains a challenge due to limitation of blood-brain barrier/blood-tumor barrier (BBB/BTB). In this study, we investigated the effects of low-dose focused ultrasound hyperthermia (UH) on the delivery and therapeutic efficacy of pegylated liposomal doxorubicin (PLD) for brain metastasis of breast cancer. Murine breast cancer cells (4T1-luc2) expressing firefly luciferase were implanted into mouse striatum as a brain tumor model. The mice were intravenously injected with PLD with/without transcranial pulsed-wave/continuous-wave UH (pUH/cUH) treatment on day-6 after tumor implantation...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069200/effects-of-low-intensity-ultrasound-on-the-growth-cell-membrane-permeability-and-ethanol-tolerance-of-saccharomyces-cerevisiae
#10
Chunhua Dai, Feng Xiong, Ronghai He, Weiwei Zhang, Haile Ma
Effects of low-intensity ultrasound (at different frequency, treatment time and power) on Saccharomyces cerevisiae in different growth phase were evaluated by the biomass in the paper. In addition, the cell membrane permeability and ethanol tolerance of sonicated Saccharomyces cerevisiae were also researched. The results revealed that the biomass of Saccharomyces cerevisiae increased by 127.03% under the optimum ultrasonic conditions such as frequency 28kHz, power 140W/L and ultrasonic time 1h when Saccharomyces cerevisiae cultured to the latent anaphase...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069196/research-on-ultrasonic-excitation-for-the-removal-of-drilling-fluid-plug-paraffin-deposition-plug-polymer-plug-and-inorganic-scale-plug-for-near-well-ultrasonic-processing-technology
#11
Zhenjun Wang, Jing Zeng, Hao Song, Feng Li
Near-well ultrasonic processing technology attracts more attention due to its simple operation, high adaptability, low cost and no pollution to the formation. Although this technology has been investigated in detail through laboratory experiments and field tests, systematic and intensive researches are absent for certain major aspects, such as whether ultrasonic excitation is better than chemical agent for any plugs removal; whether ultrasound-chemical combination plug removal technology has the best plugs removal effect...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28039630/sublethal-effect-assessment-of-a-low-power-and-dual-frequency-anti-cyanobacterial-ultrasound-device-on-the-common-carp-cyprinus-carpio-a-field-study
#12
Didier Techer, Sylvain Milla, Damien Banas
The use of ultrasonication for cyanobacterial control in freshwater bodies has become increasingly popular during the last decades despite controversial efficiency on large scale application. Apart from that, little information is currently available regarding ultrasound toxicity potential towards non-target species. This work was designed to address this issue in the common carp using a low-power (7-9 W output) and dual-frequency (23 and 46 kHz) anti-cyanobacterial ultrasound device. Results showed that carps were unaffected by ultrasound exposure when exposed in floating cages in fish ponds over a 30-day period...
December 30, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28038318/3d-ultrasound-imaging-in-frequency-domain-with-1d-array-transducer
#13
Zhihui Han, Hu Peng, Putian Lu
Freehand three-dimensional (3D) ultrasound imaging usually uses a moving elevation focused one-dimensional (1D) transducer to construct a series of B-mode slice images, and then these B-mode slice images are combined to form a 3D volume image. This method has poor elevation resolution and low frame rate. In this paper, a novel 3D imaging method with a moving 1D array transducer is proposed. Different from the freehand 3D reconstruction, a linear array transducer without elevation focusing is used in the proposed method, and the 1D transducer transmits limited diffraction beams and receives echo signals repeatedly when moving along the elevation direction...
December 16, 2016: Ultrasonics
https://www.readbyqxmd.com/read/28035640/a-multi-directional-perfect-reconstruction-filter-bank-designed-with-2-d-eigenfilter-approach-application-to-ultrasound-speckle-reduction
#14
Mukund B Nagare, Bhushan D Patil, Raghunath S Holambe
B-Mode ultrasound images are degraded by inherent noise called Speckle, which creates a considerable impact on image quality. This noise reduces the accuracy of image analysis and interpretation. Therefore, reduction of speckle noise is an essential task which improves the accuracy of the clinical diagnostics. In this paper, a Multi-directional perfect-reconstruction (PR) filter bank is proposed based on 2-D eigenfilter approach. The proposed method used for the design of two-dimensional (2-D) two-channel linear-phase FIR perfect-reconstruction filter bank...
February 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28029703/the-sonographic-stenosis-index-a-new-specific-quantitative-measure-of-transplant-hepatic-arterial-stenosis
#15
Thomas X Le, Daniel S Hippe, Michael F McNeeley, Manjiri K Dighe, Theodore J Dubinsky, Sherwin S Chan
OBJECTIVES: This study evaluates the sensitivity and specificity of stenosis index (SI), which accounts for the entire spectral Doppler waveform, to detect significant transplant hepatic arterial stenosis. MATERIALS AND METHODS: In this institutional review board-approved, HIPAA compliant study, we retrospectively analyzed 69 patients who had catheter angiography for suspected transplant hepatic arterial stenosis (THAS) between January 2006 and December 2010; all patients had Doppler ultrasound within 30 days before angiography...
December 28, 2016: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/27997374/stable-phantom-materials-for-ultrasound-and-optical-imaging
#16
Luciana C Cabrelli, Pedro I B G B Pelissari, Alessandro M Deana, Antonio A O Carneiro, Theo Z Pavan
Phantoms mimicking the specific properties of biological tissues are essential to fully characterize medical devices. Water-based materials are commonly used to manufacture phantoms for ultrasound and optical imaging techniques. However, these materials have disadvantages, such as easy degradation and low temporal stability. In this study, we propose an oil-based new tissue-mimicking material for ultrasound and optical imaging, with the advantage of presenting low temporal degradation. A styrene-ethylene/butylene-styrene (SEBS) copolymer in mineral oil samples was made varying the SEBS concentration between 5%-15%, and low-density polyethylene (LDPE) between 0%-9%...
December 20, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27992070/exercise-for-haemophilia
#17
REVIEW
Karen Strike, Kathy Mulder, Rojer Michael
BACKGROUND: Haemophilia is a bleeding disorder associated with haemorrhaging into joints and muscles. Exercise is often used to aid recovery after bleeds, and to improve joint function in the presence of arthropathy. OBJECTIVES: Our objective was to systematically review the available evidence on the safety and effectiveness of exercise for people with haemophilia. SEARCH METHODS: We searched the Cochrane Cystic Fibrosis and Genetic Disorders Group's Coagulopathies Trials Register and electronic databases PubMed, OVID-Embase, and CINAHL...
19, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27988026/-assessment-of-amylase-and-lipase-levels-following-puncture-biopsy-and-fine-needle-aspiration-guided-by-endoscopic-ultrasound-in-pancreatic-lesions
#18
Alejandro Membrillo-Romero, Rubén Gonzalez-Lanzagorta, Dulce María Rascón-Martínez
BACKGROUND: Puncture biopsy and fine needle aspiration guided by endoscopic ultrasound has been used as an effective technique and is quickly becoming the procedure of choice for diagnosis and staging in patients suspected of having pancreatic cancer. This procedure has replaced retrograde cholangiopancreatography and brush cytology due to its higher sensitivity for diagnosis, and lower risk of complications. OBJECTIVE: To assess the levels of pancreatic enzymes amylase and lipase, after the puncture biopsy and fine needle aspiration guided by endoscopic ultrasound in pancreatic lesions and the frequency of post-puncture acute pancreatitis...
December 14, 2016: Cirugia y Cirujanos
https://www.readbyqxmd.com/read/27957529/contrast-enhancement-without-transient-map-expansion-for-species-specific-vocalizations-in-core-auditory-cortex-during-learning
#19
Kathryn N Shepard, Kelly K Chong, Robert C Liu
Tonotopic map plasticity in the adult auditory cortex (AC) is a well established and oft-cited measure of auditory associative learning in classical conditioning paradigms. However, its necessity as an enduring memory trace has been debated, especially given a recent finding that the areal expansion of core AC tuned to a newly relevant frequency range may arise only transiently to support auditory learning. This has been reinforced by an ethological paradigm showing that map expansion is not observed for ultrasonic vocalizations (USVs) or for ultrasound frequencies in postweaning dams for whom USVs emitted by pups acquire behavioral relevance...
November 2016: ENeuro
https://www.readbyqxmd.com/read/27942126/availability-usage-and-factors-affecting-usage-of-electrophysical-agents-by-physical-therapists-a-regional-cross-sectional-survey
#20
Yuichi Abe, Ah-Cheng Goh, Kei Miyoshi
[Purpose] The aim of this study was to investigate the availability, usage, and factors affecting usage of electrophysical agents by physical therapists in Nagano Prefecture, Japan. [Subjects and Methods] Questionnaires were sent to all 1,571 physical therapists working in 245 institutions within Nagano Prefecture. A total of 1,110 questionnaires were returned, out of which 1,099 (70%) questionnaires containing valid responses were analyzed. Frequencies and percentages were calculated for 22 modalities with regards to availability, usage, rate of usage, and confidence level in usage...
November 2016: Journal of Physical Therapy Science
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