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https://www.readbyqxmd.com/read/28072813/a-case-report-on-red-ear-syndrome-with-tinnitus-successfully-treated-with-transcranial-random-noise-stimulation
#1
Peter M Kreuzer, Veronika Vielsmeier, Timm B Poeppl, Berthold Langguth
BACKGROUND: The red ear syndrome represents a rare symptom complex consisting of auricular erythema associated with painful and burning sensations. It has been described in combination with tinnitus rarely. It has been hypothesized to be etiologically related to altered trigeminal afferent input, temporomandibular disorders, and thalamic dysfunction. OBJECTIVES: The initial objective of applying transcranial random noise stimulation (tRNS) in a case of red ear syndrome in combination with tinnitus was the alleviation of the phantom sounds...
January 2017: Pain Physician
https://www.readbyqxmd.com/read/28072576/ultrasonic-computed-tomography-imaging-of-iron-oxide-nanoparticles
#2
Or Perlman, Haim Azhari
Iron oxide nanoparticles (IONPs) are becoming increasingly used and intensively investigated in the field of medical imaging. They are currently FDA approved for magnetic resonance imaging (MRI), and it would be highly desirable to visualize them by ultrasound as well. Previous reports using the conventional ultrasound B-scan (pulse-echo) imaging technique have shown very limited detectability of these particles. The aim of this study is to explore the feasibility of imaging IONPs using the through-transmission ultrasound methodology and demonstrate their detectability using ultrasonic computed tomography (UCT)...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28053240/broadened-population-level-frequency-tuning-in-the-auditory-cortex-of-tinnitus-patients
#3
Kenichi Sekiya, Mariko Takahashi, Shingo Murakami, Ryusuke Kakigi, Hidehiko Okamoto
Tinnitus is a phantom auditory perception without an external sound source and is one of the most common public health concerns that impair the quality of life of many individuals. However, its neural mechanisms remain unclear. We herein examined population-level frequency tuning in the auditory cortex of unilateral tinnitus patients with similar hearing levels in both ears using magnetoencephalography. We compared auditory evoked neural activities elicited by a stimulation to the tinnitus and non-tinnitus ears...
January 4, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28048787/su-f-i-14-3d-breast-digital-phantom-for-xact-imaging
#4
S Tang, Y Chen, S Ahmad, K Yang, R Laaroussi, J Chen, P Samant, L Xiang
PURPOSE: The X-ray induced acoustic computed tomography (XACT) is a new imaging modality which combines X-ray contrast and high ultrasonic resolution in a single modality. Using XACT in breast imaging, a 3D breast volume can be imaged by only one pulsed X-ray radiation, which could dramatically reduce the imaging dose for patients undergoing breast cancer screening and diagnosis. A 3D digital phantom that contains both X-ray properties and acoustic properties of different tissue types is indeed needed for developing and optimizing the XACT system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048325/th-cd-202-07-a-methodology-for-generating-numerical-phantoms-for-radiation-therapy-using-geometric-attribute-distribution-models
#5
S Dolly, H Chen, S Mutic, M Anastasio, H Li
PURPOSE: A persistent challenge for the quality assessment of radiation therapy treatments (e.g. contouring accuracy) is the absence of the known, ground truth for patient data. Moreover, assessment results are often patient-dependent. Computer simulation studies utilizing numerical phantoms can be performed for quality assessment with a known ground truth. However, previously reported numerical phantoms do not include the statistical properties of inter-patient variations, as their models are based on only one patient...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047878/th-ab-209-06-an-investigation-of-the-feasibility-of-malignant-lesion-detection-during-routine-breast-cancer-screening-using-a-prototype-acousto-optic-transmission-ultrasound-imaging-system
#6
J R Rosenfield, J S Sandhu, P J La Riviere
PURPOSE: To investigate the feasibility of malignant lesion detection during routine breast cancer screening using an acousto-optic (AO) transmission ultrasound imaging system, particularly in premenopausal women with high breast density. METHODS: A full-field, single-projection ultrasound imaging system was developed that uses a high-resolution AO detector to convert the acoustic intensity transmitted through the compressed breast into a visual image by virtue of the AO effect in nematic liquid crystals...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047007/we-de-bra-03-construction-of-an-ultrasound-guidance-platform-for-image-guided-radiotherapy-with-the-intent-to-treat-transitional-cell-carcinoma
#7
J Sick, N Rancilio, C Fulkerson, P LaPetina, J Poulson, D Knapp, K Stantz
PURPOSE: Ultrasound (US) is a noninvasive, nonradiographic imaging technique with high spatial and temporal resolution that can be used for localizing soft-tissue structures and tumors in real-time during radiotherapy (inter- and intra-fraction). A detailed methodology integrating 3D-US within RT is presented. This method is easier to adopt into current treatment protocol than current US based systems and reduces user variability for image acquisition, thus eliminating transducer induced changes that limit CT planning system...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28040043/relationships-of-linear-and-nonlinear-ultrasound-parameters-with-porosity-and-trabecular-spacing-in-trabecular-bone-mimicking-phantoms
#8
Kang Il Lee
The speed of sound (SOS), the normalized broadband ultrasound attenuation (nBUA), and the nonlinear parameter (B/A) were measured in 18 trabecular-bone-mimicking phantoms consisting of water-saturated aluminum foams. The strong slow wave and the very weak fast wave were consistently observed in the signals transmitted through all of the phantoms. It was found that the SOS increased as the porosity and the trabecular spacing increased. In contrast, both the nBUA and the B/A showed opposite dependences on the porosity and the trabecular spacing...
December 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28018210/measuring-the-moment-to-moment-variability-of-tinnitus-the-trackyourtinnitus-smart-phone-app
#9
Winfried Schlee, Rüdiger C Pryss, Thomas Probst, Johannes Schobel, Alexander Bachmeier, Manfred Reichert, Berthold Langguth
Tinnitus, the phantom perception of sound without a corresponding external sound, is a frequent disorder which causes significant morbidity. So far there is no treatment available that reliably reduces the tinnitus perception. The research is hampered by the large heterogeneity of tinnitus and the fact that the tinnitus perception fluctuates over time. It is therefore necessary to develop tools for measuring fluctuations of tinnitus perception over time and for analyzing data on single subject basis. However, this type of longitudinal measurement is difficult to perform using the traditional research methods such as paper-and-pencil questionnaires or clinical interviews...
2016: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/27997374/stable-phantom-materials-for-ultrasound-and-optical-imaging
#10
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/27965715/speed-of-sound-in-rubber-based-materials-for-ultrasonic-phantoms
#11
A Cafarelli, P Miloro, A Verbeni, M Carbone, A Menciassi
PURPOSE: In this work we provide measurements of speed of sound (SoS) and acoustic impedance (Z) of some doped/non-doped rubber-based materials dedicated to the development of ultrasound phantoms. These data are expected to be useful for speeding-up the preparation of multi-organ phantoms which show similar echogenicity to real tissues. METHODS: Different silicones (Ecoflex, Dragon-Skin Medium) and polyurethane rubbers with different liquid (glycerol, commercial detergent, N-propanol) and solid (aluminum oxide, graphene, steel, silicon powder) inclusions were prepared...
December 2016: Journal of Ultrasound
https://www.readbyqxmd.com/read/27914403/acoustic-attenuation-imaging-of-tissue-bulk-properties-with-a-priori-information
#12
Fong Ming Hooi, Oliver Kripfgans, Paul L Carson
Attenuation of ultrasound waves traversing a medium is not only a result of absorption and scattering within a given tissue, but also of coherent scattering, including diffraction, refraction, and reflection of the acoustic wave at tissue boundaries. This leads to edge enhancement and other artifacts in most reconstruction algorithms, other than 3D wave migration with currently impractical, implementations. The presented approach accounts for energy loss at tissue boundaries by normalizing data based on variable sound speed, and potential density, of the medium using a k-space wave solver...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27884775/tuning-acoustic-and-mechanical-properties-of-materials-for-ultrasound-phantoms-and-smart-substrates-for-cell-cultures
#13
A Cafarelli, A Verbeni, A Poliziani, P Dario, A Menciassi, L Ricotti
: Materials with tailored acoustic properties are of great interest for both the development of tissue-mimicking phantoms for ultrasound tests and smart scaffolds for ultrasound mediated tissue engineering and regenerative medicine. In this study, we assessed the acoustic properties (speed of sound, acoustic impedance and attenuation coefficient) of three different materials (agarose, polyacrylamide and polydimethylsiloxane) at different concentrations or cross-linking levels and doped with different concentrations of barium titanate ceramic nanoparticles...
November 21, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27832140/the-effects-of-compensatory-auditory-stimulation-and-high-definition-transcranial-direct-current-stimulation-hd-tdcs-on-tinnitus-perception-a-randomized-pilot-study
#14
Simon Henin, Dovid Fein, Eric Smouha, Lucas C Parra
BACKGROUND: Tinnitus correlates with elevated hearing thresholds and reduced cochlear compression. We hypothesized that reduced peripheral input leads to elevated neuronal gain resulting in the perception of a phantom sound. OBJECTIVE: The purpose of this pilot study was to test whether compensating for this peripheral deficit could reduce the tinnitus percept acutely using customized auditory stimulation. To further enhance the effects of auditory stimulation, this intervention was paired with high-definition transcranial direct current stimulation (HD-tDCS)...
2016: PloS One
https://www.readbyqxmd.com/read/27806594/technical-note-bone-mineral-density-measurements-of-strontium-rich-trabecular-bone-mimicking-phantoms-using-quantitative-ultrasound
#15
Bisma Rizvi, Eric Da Silva, Luba Slatkovska, Angela M Cheung, Jahan Tavakkoli, Ana Pejović-Milić
PURPOSE: Bone quantity, as determined by the current gold standard, dual energy X-ray absorptiometry (DXA), through measured areal bone mineral density (aBMD), is subject to positive biases if bone strontium levels are high. This is of particular concern for populations administered strontium-based compounds for the treatment of osteoporosis. This study investigated the dependence of bone mineral density (BMD) determinations, and associated ultrasound-determined indices, obtained by quantitative ultrasound (QUS), on bone strontium content using a new generation of trabecular bone-mimicking phantoms...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27756496/metrological-validation-of-a-measurement-procedure-for-the-characterization-of-a-biological-ultrasound-tissue-mimicking-material
#16
Taynara Q Santos, André V Alvarenga, Débora P Oliveira, Rodrigo P B Costa-Felix
The speed of sound and attenuation are important properties for characterizing reference materials such as biological phantoms used in ultrasound applications. There are many publications on the manufacture of ultrasonic phantoms and the characterization of their properties. However, few studies have applied the principles of metrology, such as the expression of the uncertainty of measurement. The objective of this study is to validate a method for characterizing the speed of sound and the attenuation coefficient of tissue-mimicking material (TMM) based on the expression of the measurement of uncertainty...
January 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/27605920/cognitive-mechanisms-in-chronic-tinnitus-psychological-markers-of-a-failure-to-switch-attention
#17
Krysta J Trevis, Neil M McLachlan, Sarah J Wilson
The cognitive mechanisms underpinning chronic tinnitus (CT; phantom auditory perceptions) are underexplored but may reflect a failure to switch attention away from a tinnitus sound. Here, we investigated a range of components that influence the ability to switch attention, including cognitive control, inhibition, working memory and mood, on the presence and severity of CT. Our participants with tinnitus showed significant impairments in cognitive control and inhibition as well as lower levels of emotional well-being, compared to healthy-hearing participants...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27594822/theoretical-tinnitus-framework-a-neurofunctional-model
#18
Iman Ghodratitoostani, Yossi Zana, Alexandre C B Delbem, Siamak S Sani, Hamed Ekhtiari, Tanit G Sanchez
Subjective tinnitus is the conscious (attended) awareness perception of sound in the absence of an external source and can be classified as an auditory phantom perception. Earlier literature establishes three distinct states of conscious perception as unattended, attended, and attended awareness conscious perception. The current tinnitus development models depend on the role of external events congruently paired with the causal physical events that precipitate the phantom perception. We propose a novel Neurofunctional Tinnitus Model to indicate that the conscious (attended) awareness perception of phantom sound is essential in activating the cognitive-emotional value...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27586761/nearfield-and-farfield-measurements-of-dolphin-echolocation-beam-patterns-no-evidence-of-focusing
#19
James J Finneran, Jason Mulsow, Brian Branstetter, Patrick Moore, Dorian S Houser
The potential for bottlenose dolphins to actively focus their biosonar transmissions was examined by measuring emitted clicks in four dolphins using horizontal, planar hydrophone arrays. Two hydrophone configurations were used: a rectangular array with hydrophones 0.2 to 2 m from the dolphins and a polar array with hydrophones 0.5 to 5 m from the dolphins. The biosonar task was a target change detection utilizing physical targets at ranges from 1.3 to 6.3 m with all subjects and "phantom" targets at simulated ranges from 2...
August 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27553899/auditory-thalamic-circuits-and-gabaa-receptor-function-putative-mechanisms-in-tinnitus-pathology
#20
Donald M Caspary, Daniel A Llano
Tinnitus is defined as a phantom sound (ringing in the ears), and can significantly reduce the quality of life for those who suffer its effects. Ten to fifteen percent of the general adult population report symptoms of tinnitus with 1-2% reporting that tinnitus negatively impacts their quality of life. Noise exposure is the most common cause of tinnitus and the military environment presents many challenging high-noise situations. Military noise levels can be so intense that standard hearing protection is not adequate...
August 20, 2016: Hearing Research
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