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https://www.readbyqxmd.com/read/28440126/transcranial-doppler-screening-for-stroke-risk-in-children-with-sickle-cell-disease-a-systematic-review
#1
Sara Mazzucco, Marina Diomedi, Amrana Qureshi, Laura Sainati, Soundrie T Padayachee
Background Sickle cell disease (SCD) is one of the most common causes of stroke in children worldwide. Based on the results of the Stroke Prevention Trial in Sickle Cell Anemia (STOP), annual transcranial Doppler ultrasound (TCD) screening for affected children is standard practice. However, the need for TCD surveillance programs could override the accuracy of the screening, affecting the correct stratification of stroke risk and subsequent clinical management of the target population. Aims To shed light on this issue, a systematic review of the literature on TCD screening for children and adolescents with SCD was carried out (CRD42016050549), according to a list of clinically relevant questions, with a particular focus on screening practices in European countries...
January 1, 2017: International Journal of Stroke: Official Journal of the International Stroke Society
https://www.readbyqxmd.com/read/28439616/-high-intensity-focused-ultrasound-hifu-importance-in-the-treatment-of-prostate-cancer
#2
R Ganzer
BACKGROUND: High intensity focused ultrasound (HIFU) has been used since the beginning of the 1990s as an alternative treatment for prostate cancer. OBJECTIVE: Overview of the current status and critical review of the different indications for HIFU in the treatment of prostate cancer. MATERIAL AND METHODS: Review of the current literature on the indications, side effects, oncologic results and current guideline recommendations. RESULTS: The principle of HIFU is based on high energy sound waves, which lead to coagulation necrosis at the focal point...
April 24, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28437332/ultrasound-assessment-of-the-abdominal-muscles-at-rest-and-during-the-aslr-test-among-adolescents-with-scoliosis
#3
Paweł Linek, Edward Saulicz, Michał Kuszewski, Tomasz Wolny
STUDY DESIGN: Observational study. OBJECTIVE: Are there deviations in the thickness of abdominal muscles at rest in individuals with adolescent idiopathic scoliosis (AIS)? Are there deviations in abdominal muscular activity in people with AIS during the active straight leg raise (ASLR) test? SUMMARY OF BACKGROUND DATA: Ultrasound imaging can be used to assess the lateral abdominal muscle. Some authors suggest that scoliosis develops through a weakness or improper functioning of the abdominal muscles that cannot provide adequate support to the spinal segments...
May 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28437003/high-intensity-focused-ultrasound-for-the-treatment-of-adenomyosis-selection-criteria-efficacy-safety-and-fertility
#4
Lian Zhang, Fangwen Rao, Raymond Setzen
Adenomyosis is a disorder of uterus in which endometrial glands and stroma are present within the uterine musculature. The main clinical manifestations are dysmenorrhea and menorrhagia. Adenomyosis has a great impact on both the quality of life and fertility of women. The treatment of adenomyosis remains an immense challenge MATERIAL AND METHODS: Relevant articles were searched through MEDLINE, Pubmed between 2000 and March 2017. The search terms of adenomyosis, magnetic resonance imaging (MRI) features of adenomyosis, high intensity focused ultrasound (HIFU), Ultrasound-guided HIFU and MRgFUS were used...
April 24, 2017: Acta Obstetricia et Gynecologica Scandinavica
https://www.readbyqxmd.com/read/28436918/an-integrated-and-highly-sensitive-ultrafast-acoustoelectric-imaging-system-for-biomedical-applications
#5
Beatrice Berthon, Pierre-Marc Dansette, Mickael Tanter, Mathieu Pernot, Jean Provost
PURPOSE: Direct imaging of cardiac electrical activation is crucial to better understand and diagnose diseases linked to arrhythmias. This work presents an Ultrafast Acoustoelectric Imaging (UAI) system for direct and non-invasive ultrafast mapping of propagating current densities. MATERIALS AND METHODS: Acoustoelectric imaging is based on the acoustoelectric effect, the modulation of the medium's electrical impedance by a propagating ultrasonic wave. UAI triggers this effect with plane wave emissions to image current densities...
April 24, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28436860/effect-on-high-intensity-fields-of-a-tough-hydrophone-with-hydrothermal-pzt-thick-film-vibrator-and-titanium-front-layer
#6
Nagaya Okada, Shinichi Takeuchi
A novel tough hydrophone was fabricated by depositing hydrothermally synthesized lead zirconate titanate polycrystalline film on the back-side surface of a titanium plate. Our developed tough hydrophone resisted damage in a high-pressure field (15 MPa) at a focal point of a sinusoidal continuous wave driven by a concave high-intensity focused ultrasound (HIFU) transducer with up to 50 W of power input to the sound source. The hydrophone was suitable for the HIFU field, even though the hydrophone has a flat-shape tip of 3...
April 24, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28436843/fabrication-and-performance-of-a-miniaturized-and-integrated-endoscope-ultrasound-convex-array-for-digestive-tract-imaging
#7
Jue Peng, Xiaojian Peng, Hu Tang, Xiaozhen Li, Ruimin Chen, Yang Li, Tianfu Wang, Siping Chen, Koping Shung, Qifa Zhou
OBJECTIVE: This work presents the design, fabrication and testing of a miniaturized and integrated ultrasound endoscope for use as an in situ digestive diagnostic device to facilitate real-time ultrasound guidance of intervention treatments. METHODS: We designed an optimal structure to integrate an auto-focus 5-megapixel camera module with an 8-MHz, 64-element curvilinear ultrasonic array in one miniaturized package. A novel three-axis auto-focusing voice coil motor (VCM) was designed and manufactured for the camera module to move the lens position for auto-focusing and to adjust the lens tilt...
April 24, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28435502/inferior-vena-cava-measurement-with-ultrasound-what-is-the-best-view-and-best-mode
#8
Nathan M Finnerty, Ashish R Panchal, Creagh Boulger, Amar Vira, Jason J Bischof, Christopher Amick, David P Way, David P Bahner
INTRODUCTION: Intravascular volume status is an important clinical consideration in the management of the critically ill. Point-of-care ultrasonography (POCUS) has gained popularity as a non-invasive means of intravascular volume assessment via examination of the inferior vena cava (IVC). However, there are limited data comparing different acquisition techniques for IVC measurement by POCUS. The goal of this evaluation was to determine the reliability of three IVC acquisition techniques for volume assessment: sub-xiphoid transabdominal long axis (LA), transabdominal short axis (SA), and right lateral transabdominal coronal long axis (CLA) (aka "rescue view")...
April 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28434879/sonoluminescence-and-acoustic-emission-spectra-at-different-stages-of-cavitation-zone-development
#9
N V Dezhkunov, A Francescutto, L Serpe, R Canaparo, G Cravotto
The way in which a cavitation zone develops in a focused pulsed ultrasound field is studied in this work. Sonoluminescence (SL), total hydrophone output and cavitation noise spectra have been recorded across a gradual, smooth increase in applied voltage. It is shown that the cavitation zone passes through a number of stages of evolution, according to increasing ultrasound intensity, decreasing pulse period and increasing ultrasound pulse duration. Sonoluminescence is absent in the first phase and the hydrophone output spectra consists of a main line with two or three harmonics whose intensity is much lower than that of the main (fundamental) line...
April 6, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28434181/management-options-for-biochemically-recurrent-prostate-cancer
#10
REVIEW
Farhad Fakhrejahani, Ravi A Madan, William L Dahut
Prostate cancer is the most common solid tumor malignancy in men worldwide. Treatment with surgery and radiation can be curative in organ-confined disease. Unfortunately, about one third of men develop biochemically recurrent disease based only on rising prostate-specific antigen (PSA) in the absence of visible disease on conventional imaging. For these patients with biochemical recurrent prostate cancer, there is no uniform guideline for subsequent management. Based on available data, it seems prudent that biochemical recurrent prostate cancer should initially be evaluated for salvage radiation or prostatectomy, with curative intent...
May 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/28434104/mullerian-dysgenesis-a-critical-review-of-the-literature
#11
REVIEW
Souzana Choussein, Dimitrios Nasioudis, Dimitrios Schizas, Konstantinos P Economopoulos
PURPOSE: To present an update of the genetic, clinical, diagnostic, and therapeutic aspects of Mayer-Rokitansky-Kuster-Hauser (MRKH) syndrome. METHODS: Studies were considered eligible if they have evaluated patients with MRKH syndrome. Eligible articles were identified by a search of MEDLINE bibliographical database from 1950 to August 2016. A purely descriptive approach was adopted concerning all outcomes examined by the individual studies. RESULTS: MRKH syndrome is defined as congenital aplasia of the upper vagina and impairment of uterine development in normal 46XX females...
April 22, 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28433951/transesophageal-echocardiography-in-the-evaluation-of-the-trauma-patient-a-trauma-resuscitation-transesophageal-echocardiography-exam
#12
REVIEW
Stefan W Leichtle, Andrew Singleton, Mandeep Singh, Matthew J Griffee, Joshua M Tobin
The point-of-care ultrasound exam has become an essential tool for hemodynamic monitoring and resuscitation in the trauma bay as well as the intensive care unit. Transthoracic ultrasound provides a dynamic assessment of cardiac function, volume status, and fluid responsiveness that offers potential advantage over traditional methods of hemodynamic monitoring. More recently, a focused transthoracic echocardiography exam was described to improve immediate resuscitation of severely injured patients in the trauma bay...
April 7, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28433640/partial-gland-treatment-of-prostate-cancer-utilizing-high-intensity-focused-ultrasound-in-the-primary-and-salvage-setting-a-systematic-review
#13
REVIEW
Ron Golan, Adrien N Bernstein, Timothy D McClure, Art Sedrakyan, Neal A Patel, Dipen J Parekh, Leonard S Marks, Jim C Hu
PURPOSE: Advances in prostate imaging, biopsy and ablative technologies have been accompanied by growing enthusiasm for partial gland ablation, particularly using high-intensity focused ultrasound (HIFU) for treating prostate cancer. The preservation of non-cancerous prostate tissue and minimizing damage to the neurovascular bundles and external urethral sphincter may improve functional outcomes. MATERIALS AND METHODS: A systematic review was performed following the PRISMA guidelines using a combination of MeSH terms, free-text search, and review of relevant bibliographies using Medline and Embase from the inception of each database through October 10, 2016...
April 19, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28432914/adaptive-optimization-of-ultrasound-beamforming-sound-velocity-using-sub-aperture-differential-phase-gradient
#14
Che-Chou Shen, Hsiao-Chi Yang
Ultrasound array imaging systems rely on a presumed beamforming sound velocity to calculate the time compensation of each element for receive focusing. The mismatch between the tissue sound velocity and the beamforming sound velocity can degrade the focusing quality due to loss of phase coherence. Since the tissue sound velocity cannot be known in prior, an adaptive optimization of beamforming sound velocity is required to improve the image quality. Differential phase gradient of channel data is proposed to estimate the optimal sound velocity for beamforming...
April 12, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28430535/transcranial-focused-ultrasound-a-new-tool-for-non-invasive-neuromodulation
#15
Maria Fini, William J Tyler
Ultrasound (US) is widely known for its utility as a biomedical imaging modality. An abundance of evidence has recently accumulated showing that US is also useful for non-invasively modulating brain circuit activity. Through a series of studies discussed in this short review, it has recently become recognized that transcranial focused ultrasound can exert mechanical (non-thermal) bioeffects on neurons and cells to produce focal changes in the activity of brain circuits. In addition to highlighting scientific breakthroughs and observations that have driven the development of the field of ultrasonic neuromodulation, this study also provides a discussion of mechanisms of action underlying the ability of ultrasound to physically stimulate and modulate brain circuit activity...
April 21, 2017: International Review of Psychiatry
https://www.readbyqxmd.com/read/28430035/noninvasive-neuromodulation-and-thalamic-mapping-with-low-intensity-focused-ultrasound
#16
Robert F Dallapiazza, Kelsie F Timbie, Stephen Holmberg, Jeremy Gatesman, M Beatriz Lopes, Richard J Price, G Wilson Miller, W Jeffrey Elias
OBJECTIVE Ultrasound can be precisely focused through the intact human skull to target deep regions of the brain for stereotactic ablations. Acoustic energy at much lower intensities is capable of both exciting and inhibiting neural tissues without causing tissue heating or damage. The objective of this study was to demonstrate the effects of low-intensity focused ultrasound (LIFU) for neuromodulation and selective mapping in the thalamus of a large-brain animal. METHODS Ten Yorkshire swine ( Sus scrofa domesticus) were used in this study...
April 21, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28429575/recovery-from-talaromyces-marneffei-involving-the-kidney-in-a-renal-transplant-recipient-a-case-report-and-literature-review
#17
Juan Peng, Zhiyong Chen, Ruiming Cai, Xianen Huang, Liying Lin, Weixiang Liang, Zhongtang Xiong, Juan Chen, Hui Chen, Yuexin Yang, Shaoyan Liu, Qingping Jiang
Talaromyces marneffei is an emerging opportunistic infection among immunocompromised patients. We observe the first native case of disseminated T. marneffei involving the kidney in a renal transplant recipient in mainland China. We describe the comprehensive clinical course, and ultrasound imaging of renal transplant biopsy, pathologic images, and electron microscopy observation of the biopsy specimen, highlighting the relevance of biopsy findings and the blood culture. We also focus on the treatment and good outcome of the patient...
April 21, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28427658/influence-of-ultrasound-assisted-extraction-on-the-pyrolysis-characteristics-and-kinetic-parameters-of-eucalyptus
#18
Zhenyu Wang, Zhengbin He, Zijian Zhao, Songlin Yi, Jun Mu
In this study, the influence of ultrasound-assisted extraction on eucalyptus samples with special focus on pyrolysis characteristics and kinetic parameters was explored. Ultrasound and Soxhlet extraction were used to pretreat samples respectively, then samples were assayed by component analysis, TG-FTIR, and kinetic analysis. Ultrasound-assisted extraction did change the physiochemical characteristics of eucalyptus samples, particularly in regards to the quantity of extractives obtained. In TG and DTG curves, ultrasound-extracted samples reflected lower residual weight ratio (17...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28426437/supersonic-transient-magnetic-resonance-elastography-for-quantitative-assessment-of-tissue-elasticity
#19
Yu Liu, Jingfei Liu, Brett Z Fite, Josquin Foiret, Asaf Ilovitsh, J Kent Leach, Erik Dumont, Charles F Caskey, Katherine W Ferrara
Non-invasive, quantitative methods to assess the properties of biological tissues are needed for many therapeutic and tissue engineering applications. Magnetic resonance elastography (MRE) has historically relied on external vibration to generate periodic shear waves. In order to focally assess a biomaterial or to monitor the response to ablative therapy, the interrogation of a specific region of interest by a focused beam is desirable and transient MRE (t-MRE) techniques have previously been developed to accomplish this goal...
April 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28425493/characterization-of-different-microbubbles-in-assisting-focused-ultrasound-induced-blood-brain-barrier-opening
#20
Sheng-Kai Wu, Po-Chun Chu, Wen-Yen Chai, Shih-Tsung Kang, Chih-Hung Tsai, Ching-Hsiang Fan, Chih-Kuang Yeh, Hao-Li Liu
Microbubbles (MBs) serve as a critical catalyst to amplify local cavitation in CNS capillary lumen to facilitate focused ultrasound (FUS) to transiently open the blood-brain barrier (BBB). However, limited understanding is available regarding the effect of different microbubbles to induce BBB opening. The aim of this study is to characterize different MBs on their effect in FUS-induced BBB opening. Three MBs, SonoVue, Definity, and USphere, were tested, with 0.4-MHz FUS exposure at 0.62-1.38 of mechanical index (MI) on rats...
April 20, 2017: Scientific Reports
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