Bioacoustics Research Lab
University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
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Your search for ultrasound produced 3296 results.

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Title Confirmation of an ultrasound-induced mutation.in two in-vitro mammalian cell lines.
Author Doida Y, Miller MW, Cox C, Church CC.
Journal Ultrasound Med Biol
Volume
Year 1990
Abstract In-vitro V79 and L5178Y cells were exposed in a rotating test tube to.continuous-wave (CW) 1 MHz 35 W/cm2 ultrasound (0-4 or 0-3 min, respectively).and subsequently assayed for mutation as evidenced by resistance to 6-thioguanine.(6-TG). There was a modest but statistically significant increase in mutation.frequency in both cell types with increase in ultrasound exposure duration. X-ray.exposures (3-9 Gy, a "positive control") yielded a large increase in 6-TG resistance..The data support an earlier report by Kaufman (1985) of an ultrasound-induced.increase in mutation to 6-TG resistance in in-vitro mammalian cells.


Title Confirmation of the protective effect of cysteamine in in vitro ultrasound exposures.
Author Inoue M, Church CC, Brayman A, Miller MW, Malcuit MS.
Journal Ultrasonics
Volume
Year 1989
Abstract Armour and Corry (Radiat Res (1982) 89, 369-380) reported that ultrasound-induced damage to in vitro Chinese hamster ovary cells was significantly reduced in the presence of cysteamine. The objective of this study was to attempt verification of this result. Four series of experiments were undertaken using in vitro cell suspensions, namely: (1) determination of the effect of cysteamine concentration on cell growth; (2) determination of the temperature dependence of ultrasonically induced cell damage; (3) determination of a dose-response relationship for the cytotoxicity of cysteamine; and (4) assessment of cell integrity and reproductive capacity in the presence or absence of cysteamine during ultrasonic exposure. Ultrasound parameters included a resonance frequency of 1 MHz, a continuous wave exposure duration of 5 min, and intensities from 0 to 21.6 W/cm2. The results indicated a dependence of ultrasound's efficacy on the medium's temperature during insonation and a significant reduction of ultrasound efficacy in compromising cellular integrity in the presence of cysteamine.


Title Conical reflection of ultrasound from a liquid-solid interface.
Author Diachok OI, Mayer WG.
Journal J Acoust Soc Am
Volume
Year 1970
Abstract Optical techniques are employed to investigate reradiation patterns of ultrasonic waves incident on flat liquid-solid interfaces. It is shown that, for Rayleigh-angle incidence, reflection takes place into a cone rather than only into the forward direction. The apex angle of the cone is found to be twice the Rayleigh angle.


Title Conservation of receptor expression and phagocytic activity of murine macrophages exposed to various ultrasonic regimens in vitro.
Author Prohaska SS, Rimer VG, Winters MA, Humphres RC, Tuse D, Edmonds PD.
Journal J Ultrasound Med
Volume
Year 1992
Abstract Murine peritoneal macrophages insonated in vitro at 37 ?C were assayed for impairment.of adhesion to and spreading on glass coverslips, expressions of Fcy gamma and C3b receptors,.and phagocytosis. Insonation conditions were typical for exposures by B-mode imaging.equipment and approximated the most severe exposures anticipated in use of pulsed Doppler.equipment. In no case were the assay results for insonated samples significantly different from.those for the sham-exposed controls.


Title Considerations underlying the use of ultrasound to detect gallstones and foreign bodies in tissue.
Author Ludwig GD, Struthers FW.
Journal Rep Nav Med Res Inst
Volume
Year 1949
Abstract The densities of a number of gallstones have been determined and found to vary between 0.82 and 1.10 gm/cm(3). The velocity of ultrasound through gallstones slabs, beef tissues, and living human muscles, has been measured. The velocity through the gallstones varied between 1400 and 2200 m/sec. The velocity through the calf, thigh, and arm muscles of five subjects was found to vary between 1490 and 1610 m/sec with a mean value of 1540 m/sec. The mean velocity through beef tissue at 20-21?C was 1540 m/sec. From these data the characteristic acoustic impedance of gallstones and of tissue was determined. Values between 1.3 x 10(5) and 2.3 x 10(5) gm/cm(2)/sec were found for the gallstones measured. The acoustic impedance of tissue consisting mostly of muscle is 1.6 x 10(5) to 1.7 x 10(5) gm/cm(2)/sec. The energy reflection coefficient for a gallstone in tissue was calculated, and the theoretical feasibility of detecting gallstones by the use of ultrasonic echo-ranging was established. Large signals were obtained from gallstones implanted in the back muscles and in the gallbladders of dogs. A frequency range of 1.0 to 2.5 megacycles has been found to be optimum for an ultrasonic instrument for diagnostic purposes. Penetration of soft tissues for 15 cm or more is afforded, without reaching damaging intensity levels. The wave length in tissue 0.6 to 1.5 mm provides adequate resolution for the detection of gallstones and most foreign bodies. The possibility of detecting foreign bodies and tumors by use of the echo-ranging principle is discussed.


Title Constrained least squares filtering algorithm for ultrasound image deconvolution.
Author Yeoh W-S, Zhang C.
Journal IEEE Trans Biomed Eng
Volume
Year 2006
Abstract A new medical ultrasound tissue model is considered in this paper, which incorporates random fluctuations of the tissue response and provides more realistic interpretation of the received pulse-echo ultrasound signal. Using this new model, we propose an algorithm for restoration of the degraded ultrasound image. The proposed deconvolution is a modification of the classical regularization technique which combines Wiener filter and the constrained least squares (LS) algorithm for restoration of the ultrasound image. The performance of the algorithm is evaluated based on both the simulated phantom images and real ultrasound radio frequency (RF) data. The results show that the algorithm can provide improved ultrasound imaging performance in terms of the resolution gain. The deconvolved images visually show better resolved tissue structures and reduce speckle, which are confirmed by a medical expert.


Title Constrained reconstruction of object acoustic parameters from noisy ultrasound scattering data.
Author Johnson SA, Zhou Y, Tracy MK, Berggren MJ, Carruth BL, Kim WW.
Journal Proc IEEE Ultrasonic Symposium
Volume
Year 1987
Abstract This paper explores the ill-conditioned nature of the inverse scattering problem when solving the exact Helmholtz equation for ultrasonic waves. A constrained reconstruction algorithm using the Gerchberg-Papoulis procedure and conjugate gradient iterations has been developed. Simulated human artery test objects have been used for generating scattering data. Applying this constrained algorithm to scattered data permits the reconstruction of larger images in less time with better quality and less sensitivity to noise than unconstrained algorithms.


Title Construction to quantiative ultrasound diffraction tomography.
Author Duchene B, Lesselier D, tabbara W.
Journal Ultrasonics
Volume
Year 1984
Abstract No Abstract Available.


Title Constructional peculiarities of the human tibia defined by reference to.ultrasound measurement data.
Author Jansons H, Tatarinov A, Dzenis V, Kregers A.
Journal Biomaterials
Volume
Year 1984
Abstract The distribution of the acoustic properties of the human tibia was studied by the method of ultrasound probing. This enabled the determination of some constructional peculiarities of the tibia. A considerable non-uniformity of ultrasound propagation velocity has been revealed along the entire length of the bone. The uniform velocity fields were longitudinally orientated in the diaphysis whereas in the epiphyseal parts of the bone they had a cross-sectional orientation. Isorapid zones formed spiral structures positioned at an angle of 6.7 +/- 0.5 degrees to the bone axis. Moreover, right-wound spiral was characteristic of the left bone but left-wound spiral of the right. A new parameter--acoustic stiffness of the construction is suggested. In the proximal third of the bone its acoustic stiffness was more pronounced in the sagittal plane; in the middle part it was best defined in the direction of the angular zones of the bone, but in the distal part it had a clearly marked frontal orientation. A statistically valid distinction of ultrasound velocity in the cross-sectional and longitudinal zones of separate bones has been established in all the bones studied.


Title Contact mechanics and dynamics of a special type of vibrating indenter acting on a soft solid.
Author Frost HM.
Journal Technical Report 2011-1
Volume
Year 2010
Abstract This summary paper presents recent analysis to further interpret experimental data reported in the author’s physics doctoral dissertation completed and approved in 1974 at the University of Vermont (UVM), Action of Ultrasound on a Viscoelastic Solid (“HMF”) with Wesley L. Nyborg (WLN) as advisor. This present paper also indicates relevance of both for better understanding the experimental observations reported in the physiology and biophysics doctoral dissertation of Ronald M. Schnitzler completed in 1969 at UVM as well, The Effect of Highly Localized Ultrasonic Vibration on Skeletal Muscle (“RMS”). The highly localized ultrasound was applied by means of rigid indenter tips of various geometries which were ultrasonically vibrated against the surfaces of soft solids, to thus indent or even penetrate them under either continuous or intermittent contact conditions. A long-range purpose of this study was to bring to the attention of researchers and practitioners in the field of medical ultrasound bioeffects mechanisms (MUBEM’s) the strong possibility of the pervasive existence of a generally overlooked fourth major MUBEM as based on interaction of distributed force, stress, and strain fields within solid-like biological tissue or solid phases therein as mediated by shear moduli of elasticity or viscoelasticity, such as the Young’s modulus, imparting mechanical rigidity. To form a quartet, this MUBEM is added to the triad now generally regarded by researchers and physicians as the only legitimate MUBEM’s: Cavitational, thermal, and hydrodynamic. “Hydrodynamic” can either be a stand-alone phenomenon in which no cavitation is present, or a consequence of cavitation.


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