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Ultrasound protocol

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https://www.readbyqxmd.com/read/28092532/improved-shear-wave-group-velocity-estimation-method-based-on-spatiotemporal-peak-and-thresholding-motion-search
#1
Carolina Amador Carrascal, Shigao Chen, Armando Manduca, James F Greenleaf, Matthew Urban
Quantitative ultrasound elastography is increasingly being used in the assessment of chronic liver disease. Many studies have reported ranges of liver shear wave velocities values for healthy individuals and patients with different stages of liver fibrosis. Nonetheless, ongoing efforts exist to stabilize quantitative ultrasound elastography measurements by assessing factors that influence tissue shear wave velocity values, such as food intake, body mass index (BMI), ultrasound scanners, scanning protocols, ultrasound image quality, etc...
January 11, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092508/ultrasonic-shear-wave-elasticity-imaging-sequencing-and-data-processing-using-a-verasonics-research-scanner
#2
Yufeng Deng, Ned C Rouze, Mark L Palmeri, Kathryn R Nightingale
Ultrasound elasticity imaging has been developed over the last decade to estimate tissue stiffness. Shear wave elasticity imaging (SWEI) quantifies tissue stiffness by measuring the speed of propagating shear waves following acoustic radiation force excitation. This paper presents the sequencing and data processing protocols of SWEI using a Verasonics system. The selection of the sequence parameters in a Verasonics programming script is discussed in detail. The data processing pipeline to calculate group shear wave speed (SWS), including tissue motion estimation, data filtering, and SWS estimation, is demonstrated...
January 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092505/fabrication-of-linear-array-and-top-orthogonal-to-bottom-electrode-cmut-arrays-with-a-sacrificial-release-process
#3
Benjamin A Greenlay, Roger J Zemp
The microfabrication processes for sacrificial-release-based capacitive micromachined ultrasound transducer arrays are provided with an emphasis on top-orthogonal-to-bottom electrode 2-D arrays. These arrays have significant promise for high-quality 3-D imaging with reduced wiring complexity compared with fully wired arrays. The protocols and best practices are outlined in significant detail along with design considerations and notes of caution for pitfalls and factors impacting yield.
January 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28092120/pediatric-peritonsillar-abscess-outcomes-and-cost-savings-from-using-transcervical-ultrasound
#4
Zhen Huang, William Vintzileos, Heather Gordish-Dressman, Anjum Bandarkar, Brian K Reilly
OBJECTIVES: 1) To analyze clinical outcomes of children stratified by ultrasound into three diagnoses: acute tonsillitis, peritonsillar phlegmon, and abscess; and 2) To compare clinical outcomes and financial impact between children who underwent ultrasound protocol to those who did not. STUDY DESIGN: Retrospective analysis between two cohorts: ultrasound protocol group and control group. METHODS: Children with peritonsillar abscess (PTA) diagnosed in the emergency department (ED) were enrolled during a 2-year period for transcervical ultrasound evaluation of bilateral tonsillar fossae...
January 16, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28089429/diagnosis-and-quantification-of-fibrosis-steatosis-and-hepatic-siderosis-through-multiparametric-magnetic-resonance-imaging
#5
M Stoopen-Rometti, E R Encinas-Escobar, C R Ramirez-Carmona, E Wolpert-Barraza, E Kimura-Hayama, L A Sosa-Lozano, R Favila, Y Kimura-Fujikami, J A Saavedra-Abril, A Loaeza-Del Castillo
BACKGROUND: The presence of liver fibrosis is the common denominator in numerous chronic liver diseases that can progress to fibrosis and hepatocellular carcinoma. Most important, with respect to frequency, are viral hepatitis and non-alcoholic fatty liver disease, the prevalence of which is increasing in epidemic proportions. Liver biopsy, albeit imperfect, continues to be the criterion standard, but in many clinical situations tends to be replaced with noninvasive imaging methods. OBJECTIVES: The aim of the present article was to describe our imaging department experience with magnetic resonance elastography and to analyze and discuss recently published results in gastroenterology, hepatology, and radiology from other authors in the literature, complemented with a PubMed search covering the last 10 years...
January 12, 2017: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/28076462/effect-of-ultrasonic-streaming-on-intra-dentinal-disinfection-and-penetration-of-calcium-hydroxide-paste-in-endodontic-treatment
#6
Marcela Paola Castro Arias, Amanda Garcia Alves Maliza, Raquel Zanin Midena, Márcia Sirlene Zardin Graeff, Marco Antonio Húngaro Duarte, Flaviana Bombarda de Andrade
Objective: The antimicrobial effect of ultrasonic agitation of calcium hydroxide (CH) pastes in infected bovine dentin and their penetrability were evaluated using confocal laser scanning microscopy (CLSM) and microbiological culture. Material and Methods: Fifty-two bovine teeth were infected with Enterococcus faecalis using a new contamination protocol; then they received CH paste and were divided into groups with or without ultrasound. Ultrasonic agitation was conducted for 1 min with a plain point insert...
November 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28071987/a-computer-aided-diagnosis-system-using-artificial-intelligence-for-the-diagnosis-and-characterization-of-thyroid-nodules-on-ultrasound-initial-clinical-assessment
#7
Young Jun Choi, Jung Hwan Baek, Hye Sun Park, Woo Hyun Shim, Tae Yong Kim, YoungKee Shong, Jeong Hyun Lee
Background We describe an initial clinical assessment of a new, commercially available, computer-aided diagnosis (CAD) system using artificial intelligence (AI) for thyroid ultrasound, and evaluate its performance in the diagnosis of malignant thyroid nodules and categorization of nodule characteristics. Methods This prospective study protocol was reviewed and approved by the institutional review board. Patients with thyroid nodules with decisive diagnosis, whether benign or malignant on the basis of cytopathologic or US results, were consecutively enrolled from November 2015 to February 2016...
January 10, 2017: Thyroid: Official Journal of the American Thyroid Association
https://www.readbyqxmd.com/read/28069235/sonochemical-synthesis-of-novel-pyrano-3-4-e-1-3-oxazines-a-green-protocol
#8
Tamer S Saleh, Abdullah S Al-Bogami, Ahmed E M Mekky, Hamad Z Alkhathlan
The atom-efficient and green protocol for formation of pyrano[3,4-e][1,3]oxazines utilizing dimethyl carbonate under ultrasound irradiation in a presence of KF/basic alumina was reported. We provide a novel series of pyrano[3,4-e][1,3]oxazine derivatives interesting for biological screening tests. In general, it was found that ultrasound irradiations enable the reactions to occur which could not be carried out under silent conditions. These remarkable effects appeared in sonicated reactions can be reasonably interpreted in terms of acoustic cavitation phenomenon...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28069217/facile-high-yield-ultrasound-mediated-protocol-for-zno-hierarchical-structures-synthesis-formation-mechanism-optical-and-photocatalytic-properties
#9
Oana Carp, Alina Tirsoaga, Ramona Ene, Adelina Ianculescu, Raluca F Negrea, Paul Chesler, Gabriela Ionita, Ruxandra Birjega
Hierarchical flowers-like zinc oxide structures have been successfully obtained by a simple and fast ultrasound-assisted method performed in a ordinary ultrasonic bath using an ammonia solution and zinc acetate, in the absence of any surfactant or template. The composition, structure, crystallinity, morphology and optical properties of the materials obtained at different ultrasound irradiation times were characterized by infrared, UV-Vis and photoluminescence spectroscopy, X-ray diffraction, scanning and transmission electron microscopy investigations...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28067629/standardized-echocardiographic-assessment-of-cardiac-function-in-normal-adult-zebrafish-and-heart-disease-models
#10
Louis W Wang, Inken G Huttner, Celine F Santiago, Scott H Kesteven, Ze-Yan Yu, Michael P Feneley, Diane Fatkin
The zebrafish (Danio rerio) is an increasingly popular model organism in cardiovascular research. Major insights into cardiac developmental processes have been gained by studies of embryonic zebrafish. However, the utility of zebrafish for modeling adult-onset heart disease has been limited by a lack of robust methods for in vivo evaluation of cardiac function. We established a physiological protocol for underwater zebrafish echocardiography using high frequency ultrasound, and evaluated its reliability in detecting altered cardiac function in two disease models...
January 1, 2017: Disease Models & Mechanisms
https://www.readbyqxmd.com/read/28051341/effects-of-compression-garment-pressure-on-recovery-from-strenuous-exercise
#11
Jessica Hill, Glyn Howatson, Ken van Someren, David Gaze, Hayley Legg, Jack Lineham, Charles Pedlar
Compression garments are frequently used to facilitate recovery from strenuous exercise. Purpose To identify the effects of two different grades of compression garment on recovery indices following strenuous exercise. Methods Forty five recreationally active participants (n=26 males and n=19 females) completed an eccentric exercise protocol consisting of 100 drop jumps. Following the exercise protocol participants were matched for body mass and randomly but equally assigned to either a high (HI) compression pressure group, a low (LOW) compression pressure group, or a sham ultrasound group (SHAM)...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28050543/morphologic-study-of-different-treatments-for-gastrocnemius-muscle-contusion-in-rats
#12
Ana Carolina Brandt de Macedo, Julye Leiko Ywazaki, Rafael Michel de Macedo, Lucia Noronha, Anna Raquel Silveira Gomes
OBJECTIVE: Evaluate the effects of ultrasound and stretching in morphology after rat muscle contusion. METHODS: Male Wistar rats (n = 35, 8-9 weeks, 271 ± 14 g) were divided into five groups: control group (CG = 3); lesion group (LG = 8); lesion + ultrasound group (LUG = 8); lesion + stretching group (LSG = 8); lesion + ultrasound + stretching group (LUSG = 8). The ultrasound was applied in LUG and LUSG from the third to the seventh day, the dose used was 50% pulsed, 0...
November 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28048915/su-f-i-29-investigating-the-impact-of-the-amount-of-contrast-material-used-in-abdominal-ct-examinations-regarding-the-diagnosis-of-appendicolith
#13
E Lavdas, N Boci, L Sarantaenna, A Godevenos, I Ntavelis, T Theodoropoulos, G Zaimis, P Mavroidis
PURPOSE: The purpose of this study is to report the case of a young adult in which the incomplete oral administration of contrast material led to diagnosis of an appendicolith, which cause acute appendicitis. METHODS: A male 34 years old underwent CT examination due to acute abdominal pain in the upper abdomen. An ultrasound examination of the upper abdomen and kidneys, an x-ray examination of the abdomen and a CT scan of the entire abdomen and pelvis after both oral and IV administration of contrast material were performed...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048861/su-g-jep1-09-evaluation-of-transperineal-ultrasound-imaging-as-a-potential-solution-for-target-tracking-during-ablative-body-radiotherapy-for-prostate-cancer
#14
M Najafi, B Han, D Cooper, S Hancock, D Hristov
PURPOSE: Prostate SABR is emerging as a clinically viable, potentially cost effective alternative to prostate IMRT but its adoption is contingent on providing solutions for accurate tracking during beam delivery. Our goal is to evaluate the performance of the Clarity Autoscan ultrasound monitoring system for inter-fractional prostate motion tracking in both phantoms and in-vivo. METHODS: In-vivo evaluation was performed under IRB protocol to allow data collection in prostate patients treated with VMAT whereby prostate was imaged through the acoustic window of the perineum...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048367/th-a-207b-00-shear-wave-imaging-and-a-qiba-us-biomarker-update
#15
Paul Carson
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047721/th-a-207b-01-basics-and-current-implementations-of-ultrasound-imaging-of-shear-wave-speed-and-elasticity
#16
S Chen
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047072/th-a-207b-02-qiba-ultrasound-elasticity-imaging-system-biomarker-qualification-and-user-testing-of-systems
#17
B Garra
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
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
#18
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/28046589/tu-h-campus-iep3-04-evaluation-of-changes-in-quantitative-ultrasound-parameters-during-prostate-radiotherapy
#19
M Najafi, A El Kaffas, B Han, D Cooper, S Hancock, D Hristov
PURPOSE: Clarity Autoscan ultrasound monitoring system allows acquisition of raw radiofrequency (RF) ultrasound data prior and during radiotherapy. This enables the computation of 3D Quantitative Ultrasound (QUS) tissue parametric maps from. We aim to evaluate whether QUS parameters undergo changes with radiotherapy and thus potentially be used as early predictors and/or markers of treatment response in prostate cancer patients. METHODS: In-vivo evaluation was performed under IRB protocol to allow data collection in prostate patients treated with VMAT whereby prostate was imaged through the acoustic window of the perineum...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046001/the-diagnosis-and-management-of-patients-with-renal-colic-across-a-sample-of-us-hospitals-high-ct-utilization-despite-low-rates-of-admission-and-inpatient-urologic-intervention
#20
Elizabeth M Schoenfeld, Penelope S Pekow, Meng-Shiou Shieh, Charles D Scales, Tara Lagu, Peter K Lindenauer
OBJECTIVES: Symptomatic ureterolithiasis (renal colic) is a common Emergency Department (ED) complaint. Variation in practice surrounding the diagnosis and management of suspected renal colic could have substantial implications for both quality and cost of care as well as patient radiation burden. Previous literature has suggested that CT scanning has increased with no improvements in outcome, owing at least partially to the spontaneous passage of kidney stones in the majority of patients...
2017: PloS One
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