- Transmission of acoustic waves through piezoelectric plates: modeling and experiment
- The transmission of acoustic waves through a piezoelectric plate is dealt with theoretically and experimentally. The analytical treatment engages the octet formalism of anisotropic piezoacoustics. A specific version of the plate admittance matrix is introduced, which incorporates the electric boundary conditions for a non-metallized or metallized p....
- Authors:Le Clezio;E.;Shuvalov;A.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Axial transmission techniques for bone assessment: an in vitro comparative study
- The objective of this paper was to compare three different approaches using ultrasonic axial transmission in vitro. Forty-one fresh human radii with soft tissue removed were investigated. Measurements of ultrasound velocity of the fastest signal contribution have been performed with a commercial device (Sunlight Omnisense/spl trade/, 1.25 MHz), a p....
- Authors:Muller;M.;Moilanen;P.;Talmant;M.;Kilappa;V.;Nicholson;P.;Timonen;J.;Cheng;S.;Laugier;P.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Application of the Kramers-Kronig relations to measurements of attenuation and dispersion in cancellous bone
- Ultrasonic (US) assessment of fracture risk in osteoporotic patients is based on measurements of broadband US attenuation and speed of sound (SOS) of cancellous bone. Discrepancies in estimates of SOS can result from dispersion and frequency-dependent attenuation. An improved understanding of the relation between attenuation and dispersion could be....
- Authors:Waters;K.R.;Hoffmeister;B.K.;Javarone;J.A.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Ultrasonic wave dispersion and attenuation in a periodically two-layered medium [cancellous bone modeling]
- In this work, we use numerical method to simulate wavefield propagation through a stratified cancellous bone model. A broadband Berlage pulse with a dominant frequency of 0.9 MHz was used to simulate an ultrasonic signal traveling through the model. Based on our preliminary work of elastic cases, the simulated signal displayed strong reverberation ....
- Authors:Lu Yu;Le;L.H.;Sacchi;M.D.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Characterization of human femoral trabecular bone in vitro using transmission and backscatter ultrasound measurements
- We investigated the relationships between ultrasonic properties and bone properties measured on the human proximal femur. Two-dimensional scans in transmission and pulse-echo mode were performed using 1-MHz focused transducers to measure ultrasound parameters: slope of the frequency-dependent attenuation coefficient (nBUA); speed of sound (SOS); br....
- Authors:Jenson;F.;Padilla;F.;Peyrin;F.;Cloetens;P.;Bousson;V.;Bergot;C.;Laredo;J.-D.;Latremouille;C.;Laugier;P.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Acoustic microscopy for detection of osteoporotic bone properties
- Acoustic microscopy reveals the possibility of delivering morphological and mechanical information simultaneously in the microscopic range and in two dimensions. Acoustic impedance was measured using a highly focussed 50 MHz transducer and a 200 MHz transducer to study the change in acoustic properties of bone in the case of osteoporotic skeletal d....
- Authors:Brandt;J.;Franke;A.;Raum;K.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Impact of material and structural bone properties on 1-MHz velocity measurements in human forearms
- The ultrasonic axial transmission technique allows investigation of skeletal sites, such as the cortical layer of long bones (radius, tibia). We investigated, in vitro, the relationships between 1 MHz axial transmission speed of sound (SOS) measurements at the radius and site-matched measurements of cortical thickness (C.TH), intracortical porosity....
- Authors:Bossy;E.;Talmant;M.;Akrout;L.;Laugier;P.;Peyrin;F.;Cloetens;P.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Quantitative blood flow estimation error due to the in-plane component of the flow with intravascular ultrasound
- Previously, we presented the flow estimation error introduced by in-plane flow using a slow-time FIR (finite impulse response) filter-bank method to measure quantitatively blood flow decorrelation through the image plane of an intravascular ultrasound (IVUS) imaging system. There exists a monotonic relationship between blood flow velocity and the n....
- Authors:de Ana;F.J.;O'Donnell;M.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- ECG-triggered retrospective colour flow imaging
- Colour flow imaging systems estimate flow velocities by measuring the phase/time shift between backscattered signals. Using a high-frequency single-element transducer, colour flow imaging of blood velocities has been accomplished in mice by sweeping the transducer over a region of interest. This technique, however, has limitations: tissue clutter a....
- Authors:Williams;R.;Needles;A.;Duckett;A.;Cherin;E.;Foster;F.S.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Clutter-free Doppler detection of signed velocity based on Legendre series expansion
- A clutter-free velocimetry based on Legendre polynomial series expansion, which can fully utilize the unique low-frequency cut-off characteristic of the polynomial regression filter, is conceived. A set of complex I/Q Doppler signals, with a packet size of N, is expanded into a series of Legendre polynomials, obtaining expansion coefficients, L(n),....
- Authors:Umemura;S.;Azuma;T.;Hayashi;T.Publisher:Ultrasonics Symposium;2004 IEEEConference Date:23-27 Aug. 2004ISSN:0-7803-8412-1Total Page:3 vol. (xxxvii+2333)
- Analysis and design of feeding structures
- Simultaneous propagation of bound and lea
- The effect of substrate anisotropy on the
- Monolithic integration of an X-band circu
- Thin film isolators utilizing MSSW transd
- A latching ferrite rotary-field phase shi
- Normal-mode analysis of coupled-slots wit
- 60-GHz monolithic oscillator using InGaP/
- A low cost 3.6V single-supply GaAs power
- A double-polysilicon bipolar process with
- A novel 3V, 7 mA PHEMT GaAs active MMIC m
- A low-current linearity sweet spot in HFE
- Mode-selective negative coupling for impl
- Dual-mode dielectric-loaded resonators wi
- Complete design for five-pole in line ell
- Mixed modes cylindrical planar dielectric
- Treatment of instabilities of one-way equ
- A broadband absorbing boundary condition
- A stretched coordinate technique for nume
- Application of the PML absorbing boundary
- A monolithic W-band high-gain LNA/detecto
- Design and modeling of multipatches plana
- Coupled radiation between concentrically
- Field simulation of applicators for inter
- Monopoles for microwave catheter ablation