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high frequency ultrasound

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https://www.readbyqxmd.com/read/28333640/integrated-hifu-drive-system-on-a-chip-for-cmut-based-catheter-ablation-system
#1
Omid Farhanieh, Ali Sahafi, Rupak Bardhan Roy, Arif Sanli Ergun, Ayhan Bozkurt
Conventional High Intensity Focused Ultrasound (HIFU) is a therapeutic modality which is extracorporeally administered. In applications where a relatively small HIFU lesion is required, an intravascular HIFU probe can be deployed to the ablation site. In this paper, we demonstrate the design and implementation a fully integrated HIFU drive system on a chip to be placed on a 6 Fr catheter probe. An 8-element capacitive micromachined ultrasound transducer (CMUT) ring array of 2 mm diameter has been used as the ultrasound source...
March 20, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28325652/effect-of-ultrasound-on-silver-electrodeposition-crystalline-structure-modification
#2
Aymeric Nevers, Loïc Hallez, Francis Touyeras, Jean-Yves Hihn
An attractive possibility for influencing microstructures of electrodeposited coatings, and therefore their properties such as hardness, brightness etc. resides in the use of ultrasound. This method is particularly competitive as it may result in a reduction of chemical use, or even in the complete suppression of chemicals. This paper deals with silver coatings depending strongly on current density, with two main categories identified by X-ray diffraction: one poorly structured and the other following the [110] orientation...
February 27, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28325432/wide-awake-ultrasound-guided-percutaneous-extensor-central-slip-tenotomy-for-chronic-mallet-finger-a-prospective-study-of-14-cases-with-videos
#3
T Apard, G Candelier
The central slip tenotomy described by Fowler is an effective option for treating chronic mallet finger in order to avoid swan neck deformity of the finger. In a prospective study of 14 cases (13 failures of conservative treatment and one case of untreated mallet finger), we performed percutaneous ultrasound-guided central slip tenotomy with a 19 G needle using the wide-awake local anesthesia and no tourniquet (WALANT) technique. The mean extensor lag before surgery was 28° (range 20°-40°) and three patients had a swan neck deformity...
April 2017: Hand Surgery and Rehabilitation
https://www.readbyqxmd.com/read/28324997/assessing-the-development-of-fetal-myocardial-function-by-a-novel-doppler-myocardial-performance-index
#4
Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami
Doppler-derived myocardial performance index are used to assess aspects of systolic and diastolic function in adult as well as fetal heart. The Tei Index (TI) is a useful and non-invasive tool. The aim of this study was to determine normal values of fetal left ventricular (LV) TI in early (16-32 weeks) and late trimester (35-41 weeks) fetuses and to develop a new myocardial performance index (K-index; KI) which focuses on fetal diastolic interval when oxygenated blood from the placenta filled in the LV. Simultaneous recordings of Doppler Ultrasound Signal (DUS) of the LV outflow tracts and fetal electrocardiogram signals were obtained in 55 early- and late-trimester fetuses...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28320658/compressed-sensing-based-synthetic-transmit-aperture-imaging-validation-in-a-convex-array-configuration
#5
Jing Liu, Qiong He, Jianwen Luo
According to the linear acoustic theory, the channel data of a plane wave emitted by a linear array is a linear combination of the full dataset of synthetic transmit aperture (STA). Combining this relationship with compressed sensing (CS), a novel CS based ultrasound beamforming strategy, named compressed sensing based synthetic transmit aperture (CS-STA), was previously proposed to increase the frame rate of ultrasound imaging without sacrificing the image quality for a linear array. In this paper, assuming linear transfer function of pulse-echo ultrasound system, we derived and applied the theory of CS-STA for a slightly curved array and validated CS-STA in a convex array configuration...
March 14, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28320447/subclinical-dermal-involvement-is-detectable-by-high-frequency-ultrasound-even-in-patients-with-limited-cutaneous-systemic-sclerosis
#6
A Sulli, B Ruaro, V Smith, S Paolino, C Pizzorni, G Pesce, M Cutolo
BACKGROUND: The aim of the study was to detect by skin high-frequency ultrasound (US) possible subclinical skin involvement in patients affected by limited cutaneous systemic sclerosis (lcSSc), in those skin areas apparently not affected by the disease on the basis of a normal modified Rodnan skin score (mRSS). Differences in dermal thickness (DT) in comparison with healthy subjects were investigated. METHODS: Fifty patients with lcSSc (age 62 ± 13 years (mean ± SD), disease duration 5 ± 5 years) and 50 sex-matched and age-matched healthy subjects (age 62 ± 11 years) were enrolled...
March 20, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/28318888/characterization-of-the-lung-parenchyma-using-ultrasound-multiple-scattering
#7
Kaustav Mohanty, John Blackwell, Thomas Egan, Marie Muller
The purpose of the study described here was to showcase the application of ultrasound to quantitative characterization of the micro-architecture of the lung parenchyma to predict the extent of pulmonary edema. The lung parenchyma is a highly complex and diffusive medium for which ultrasound techniques have remained qualitative. The approach presented here is based on ultrasound multiple scattering and exploits the complexity of ultrasound propagation in the lung structure. The experimental setup consisted of a linear transducer array with an 8-MHz central frequency placed in contact with the lung surface...
March 16, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28303912/new-technologies-for-the-assessment-of-neuropathies
#8
REVIEW
Roberto Gasparotti, Luca Padua, Chiara Briani, Giuseppe Lauria
Technical advances are rapidly changing the clinical and instrumental approach to peripheral nerve diseases. Magnetic resonance neurography, diffusion tensor imaging and nerve ultrasonography are increasingly entering the diagnostic workup of peripheral neuropathies as tools that complement neurophysiology and enable investigation of proximal structures, such as plexuses and roots. Progress in the design of magnetic resonance scanners and sequences, and the development of high-frequency ultrasound probes mean that high-resolution peripheral nerve imaging is possible, enabling detailed examination of nerve size, morphology and internal fascicular structure that can integrate nerve conduction studies into clinical practice...
March 17, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28303659/invasive-characterization-of-atherosclerotic-plaque-in-patients-with-peripheral-arterial-disease-using-near-infrared-spectroscopy-intravascular-ultrasound
#9
Amr E Abbas, Sibin K Zacharias, James A Goldstein, Ivan D Hanson, Robert D Safian
OBJECTIVES: We describe the characteristics of atherosclerotic plaque in patients with peripheral arterial disease (PAD) using near-infrared spectroscopy-intravascular ultrasound (NIRS-IVUS) BACKGROUND: Imaging and autopsy studies have described atherosclerotic plaque in different vascular beds, including varying degrees of lipid, fibrosis, and calcification. Recently, NIRS has been validated as an accurate method for detecting lipid-core plaque (LCP) in the coronary circulation. Invasive evaluation of plaque composition using NIRS-IVUS has not been reported in different peripheral arterial circulations...
March 17, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28301597/boiling-histotripsy-lesion-characterization-on-a-clinical-magnetic-resonance-imaging-guided-high-intensity-focused-ultrasound-system
#10
Avinash Eranki, Navid Farr, Ari Partanen, Karun V Sharma, Hong Chen, Christopher T Rossi, Satya V V N Kothapalli, Matthew Oetgen, AeRang Kim, Ayele H Negussie, David Woods, Bradford J Wood, Peter C W Kim, Pavel S Yarmolenko
PURPOSE: High intensity focused ultrasound (HIFU) is a non-invasive therapeutic technique that can thermally ablate tumors. Boiling histotripsy (BH) is a HIFU approach that can emulsify tissue in a few milliseconds. Lesion volume and temperature effects for different BH sonication parameters are currently not well characterized. In this work, lesion volume, temperature distribution, and area of lethal thermal dose were characterized for varying BH sonication parameters in tissue-mimicking phantoms (TMP) and demonstrated in ex vivo tissues...
2017: PloS One
https://www.readbyqxmd.com/read/28299710/high-resolution-microultrasound-%C3%AE-us-investigation-of-the-gastrointestinal-gi-tract
#11
Thineskrishna Anbarasan, Christine E M Démoré, Holly Lay, Mohammed R S Sunoqrot, Romans Poltarjonoks, Sandy Cochran, Benjamin F Cox
High resolution, microultrasound (μUS) scanning of the gastrointestinal (GI) tract has potential as an important transmural imaging modality to aid in diagnosis. Operating at higher frequencies than conventional clinical ultrasound instruments, μUS is capable of providing scanned images of the GI tract with higher resolution. To investigate the use of μUS for this application, a phantom which is cost effective, within ethical guidelines and, most importantly, similar in histology to the human GI tract is necessary...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28298968/feasibility-of-imaging-superficial-palmar-arch-using-micro-ultrasound-7t-and-3t-magnetic-resonance-imaging
#12
Alison N Pruzan, Audrey E Kaufman, Claudia Calcagno, Yu Zhou, Zahi A Fayad, Venkatesh Mani
AIM: To demonstrate feasibility of vessel wall imaging of the superficial palmar arch using high frequency micro-ultrasound, 7T and 3T magnetic resonance imaging (MRI). METHODS: Four subjects (ages 22-50 years) were scanned on a micro-ultrasound system with a 45-MHz transducer (Vevo 2100, VisualSonics). Subjects' hands were then imaged on a 3T clinical MR scanner (Siemens Biograph MMR) using an 8-channel special purpose phased array carotid coil. Lastly, subjects' hands were imaged on a 7T clinical MR scanner (Siemens Magnetom 7T Whole Body Scanner) using a custom built 8-channel transmit receive carotid coil...
February 28, 2017: World Journal of Radiology
https://www.readbyqxmd.com/read/28297139/usefulness-of-ultrasonography-in-the-diagnosis-of-neonatal-dacryocystocele
#13
Igor Vázquez-Osorio, Angela Hernández-Martín
Neonatal dacryocystocele is an uncommon process that may evolve into acute dacryocystitis within the first weeks of life. Neonatal acute dacryocystitis must be treated promptly to avoid potential severe infectious complications. High-frequency ultrasound is a noninvasive method of diagnosing dacryocystocele, facilitating early therapeutic intervention.
March 2017: Pediatric Dermatology
https://www.readbyqxmd.com/read/28287967/vibrational-responses-of-bound-and-non-bound-targeted-lipid-coated-single-microbubbles
#14
Tom van Rooij, Ines Beekers, Kirby R Lattwein, Ton van der Steen, Nico de Jong, Klazina Kooiman
One of the main challenges for ultrasound molecular imaging is acoustically distinguishing non-bound microbubbles from those bound to their molecular target. In this in vitro study, we compared two types of in-house produced targeted lipidcoated microbubbles, either consisting of DPPC or DSPC lipid as the main lipid, using the Brandaris 128 ultra-high-speed camera to determine vibrational response differences between bound and non-bound biotinylated microbubbles. In contrast to previous studies that studied vibrational differences upon binding, we used a covalently bound model biomarker (i...
March 7, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28287528/ultrasound-based-pulse-wave-velocity-evaluation-in-mice
#15
Nicole Di Lascio, Claudia Kusmic, Francesco Stea, Francesco Faita
Arterial stiffness can be evaluated by calculating pulse wave velocity (PWV), i.e., the speed with which the pulse wave travels in a conduit vessel. This parameter is being increasingly investigated in small rodent models in which it is used for assessing alterations in vascular function related to particular genotypes/treatments or for characterizing cardiovascular disease progression. This protocol describes an image processing algorithm which leads to non-invasive arterial PWV measurement in mice using ultrasound (US) images only...
February 14, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28284883/etomidate-versus-propofol-sedation-for-complex-upper-endoscopic-procedures-a-prospective-double-blinded-randomized-controlled-trial
#16
Mi Gang Kim, Se Woo Park, Jae Hyun Kim, Jin Lee, Sea Hyub Kae, Hyun Joo Jang, Dong Hee Koh, Min Ho Choi
BACKGROUND AND AIMS: Although a growing body of evidence demonstrates that propofol-induced deep sedation can be effective and performed safely, cardiopulmonary adverse events have been frequently observed. Etomidate is a new emerging drug that provides hemodynamic and respiratory stability, even in high-risk patient groups. The objective of this study was to compare safety and efficacy profiles of etomidate and propofol for endoscopic sedation. METHODS: A total of 128 patients undergoing endoscopic ultrasound were randomized to receive either etomidate or propofol blinded administered by a registered nurse...
March 8, 2017: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/28283264/uterine-contractility-and-elastography-as-prognostic-factors%C3%A2-for-pregnancy-after-intrauterine-insemination
#17
Nelly Swierkowski-Blanchard, Florence Boitrelle, Laura Alter, Jacqueline Selva, Thibaud Quibel, Antoine Torre
OBJECTIVE: To determine the impact of the frequency and intensity of uterine contractions (UCs) at the time of IUI on subsequent fertility. DESIGN: Observational pilot study. SETTING: University hospital. PATIENT(S): One hundred volunteer women scheduled for IUI between April 2011 and July 2013, in whom UCs were assessed during the ultrasound before IUI. INTERVENTION(S): A two-dimensional sagittal uterus elastography was recorded for 5 minutes...
March 7, 2017: Fertility and Sterility
https://www.readbyqxmd.com/read/28275563/neonatal-cranial-sonography-ultrasound-findings-in-neonatal-meningitis-a-pictorial-review
#18
REVIEW
Nishant Gupta, Hemal Grover, Itisha Bansal, Kusum Hooda, Joshua M Sapire, Rama Anand, Yogesh Kumar
Neonatal bacterial meningitis is a common manifestation of late onset neonatal sepsis. Cranial sonography (CRS) has a crucial role in assessment of infants with clinical suspicion of bacterial meningitis as well as follows up of its complications. CRS is performed with high frequency transducer through anterior fontanelle in both coronal and sagittal planes. Various sonographic findings range from echogenic and widened sulci, ventriculomegaly, ventriculitis, hydrocephalus, extra-axial fluid collections, cerebritis and brain abscess...
February 2017: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28275221/magnetic-resonance-mr-cholangiopancreatography-demonstration-of-the-cystic-duct-entering-the-right-hepatic-duct
#19
Tommaso D'Angelo, Sergio Racchiusa, Silvio Mazziotti, Giuseppe Cicero
BACKGROUND MR cholangiopancreatography is widely performed before laparoscopic cholecystectomy to rule out choledocholithiasis and to avoid iatrogenic injuries that may be related to the high frequency of anatomical variations of the biliary tree. Although most of these variants have already been demonstrated surgically and by endoscopic retrograde cholangiopancreatography and CT cholangiography, there are no references in which MR cholangiopancreatography has shown a cystic duct draining into the right hepatic biliary duct...
March 9, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28275021/m%C3%A3-llerianosis-of-the-urinary-bladder-a-rare-and-problematic-bladder-tumour
#20
Amit Patel, Pranali Desai, Frances Malczewski, Daryl Stephens
Müllerianosis of the bladder is an extremely rare and highly symptomatic bladder tumour comprising of at least two types of Müllerian derived tissues. We present the case of a 59-year-old woman presenting with painful macroscopic haematuria associated with urgency, frequency and incontinence. She is a nulliparous postmenopausal woman without malignancy risk factors or previous abdominal surgery. Initially identified on ultrasound scan, she was taken for transurethral resection of bladder tumour (TURBT). Histology confirms the diagnosis...
March 8, 2017: BMJ Case Reports
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