Results 11 to 20 of about 250,186 (352)

Correction of concentrated and distributed aberrations in medical ultrasound imaging [PDF]

, 1996
A method is presented for iterative correction of wave fields aberrated in a plane located at an arbitrary distance from an array transducer. The signals received from the transducer are processed by an inverse extrapolator in such a way that the output ...
Berkhoff, A.P., Thijssen, J.M.
core   +9 more sources

Efficacy of ultrasonics and Er,Cr:YSGG laser on root surface calculus removal: A comparative in vitro field emission scanning electron microscope study [PDF]

Journal of Advanced Periodontology and Implant Dentistry
Background. Scaling and root planing (SRP) is an inevitable primary step in non-surgical periodontal therapy. Debridement carried out with manual instruments and ultrasonics results in the removal of tooth structure.
Afreen Jannath, Rajasekar Sundaram, Suganya Selvarangam, Krishnan Viswanathan, Srinivasan Sivapragasam   +4 more
doaj   +1 more source

Ultrasound-Based Radiomics Analysis for Preoperatively Predicting Different Histopathological Subtypes of Primary Liver Cancer

Frontiers in Oncology, 2020
BackgroundPreoperative identification of hepatocellular carcinoma (HCC), combined hepatocellular–cholangiocarcinoma (cHCC-ICC), and intrahepatic cholangiocarcinoma (ICC) is essential for treatment decision making.
Yuting Peng, Peng Lin, Linyong Wu, Da Wan, Yujia Zhao, Li Liang, Xiaoyu Ma, Hui Qin, Yichen Liu, Xin Li, Xinrong Wang, Yun He, Hong Yang   +12 more
doaj   +1 more source

Ultrasonic wave propagation in cylindrical vessels and implications for ultrasonic reactor design [PDF]

, 2010
Reactors in which processes are enhanced by ultrasound are hampered by the lack of a theoretical framework on their design. Simulation results of ultrasonic wave propagation in a cylindrical geometry are presented in this work, which are then used to ...
Gachagan, A., Mutasa, T., Nordon, A., O'Leary, R.L.   +3 more
core   +1 more source

Intensity-adjustable pain management with prolonged duration based on phase-transitional nanoparticles-assisted ultrasound imaging-guided nerve blockade

Journal of Nanobiotechnology, 2022
Background The lack of a satisfactory strategy for postoperative pain management significantly impairs the quality of life for many patients. However, existing nanoplatforms cannot provide a longer duration of nerve blockage with intensity-adjustable ...
Bin Qiao, Xinye Song, Weiyi Zhang, Ming Xu, Bowen Zhuang, Wei Li, Huanling Guo, Wenxin Wu, Guangliang Huang, Minru Zhang, Xiaoyan Xie, Nan Zhang, Yong Luan, Chunyang Zhang   +13 more
doaj   +1 more source

A comparison of two configurations for a dual-resonance cymbal transducer [PDF]

, 2018
The ability to design tuned ultrasonic devices that can be operated in the same mode at two different frequencies has the potential to benefit a range of applications, such as surgical cutting procedures where the penetration through soft then hard ...
Feeney, Andrew, Lucas, Margaret
core   +1 more source

Myocardial contrast echocardiography in the diagnosis of postoperative takotsubo myocardiopathy: case report and literature review

BMC Cardiovascular Disorders, 2019
Background Takotsubo cardiomyopathy (TCM) is a brief ventricular dysfunction that usually occurs after emotional or physical stress. Here, we report a patient who underwent cardiac surgery and then developed TCM during the postoperative period.
Jia-Hui Zeng, Wei Li, Feng-Juan Yao, Dong-Hong Liu, Cui-Ling Li, Yan-Qiu Liu, Rui Fan, Min Ye, Hong Lin   +8 more
doaj   +1 more source

On the optical nonlinearity in the GeSbSe chalcogenide glasses

Materials Research Express, 2020
Chalcogenide glasses Ge _x Sb _40−x Se _60 with composition 12, 25 and 30 at.%, synthesized from elements with 5N purity (Ge, Sb, Se) by the conventional melt-quenching method were studied.
Nicoleta Nedelcu, Veturia Chiroiu, Ligia Munteanu, Iulian Girip   +3 more
doaj   +1 more source

Simulation of the influence of hydrophones used for the characterization of pressure field distribution in low frequency, high power ultrasonic reactor vessels [PDF]

, 2007
This paper describes the use of a finite element (FE) modeling approach to investigate the influence of different hydrophone designs in laboratory scale reactor vessels.
Gachagan, A., Harvey, G., O'Leary, R.L.
core   +1 more source

Directivity pattern of the sound radiated from square stepped-plate radiators

Acta Acustica, 2020
A square flat-plate radiator driven by a longitudinal vibrator at the resonant frequency of its fourth-order natural vibration mode at its center for the generation of highly directional ultrasonic radiation in air is studied herein.
Xiping He, Na Li
doaj   +1 more source