In vivo imaging using a copolymer phased array.


:Phased-array images have been obtained in vivo with a steered copolymer array operating at 2.5 MHz. The array was fabricated using 28 microns copolymer film, lambda/4 resonant at 21 MHz, which was bonded to a glass ceramic backing with a thin film bond. The 32 array elements were created by laser ablation of the continuous gold electrode on one side of the film. The transducer was driven by 200 V shock excitation, and the received signal was processed by 32 custom IC preamplifiers that were mounted to the array connector. The amplifiers had a high input impedance compared to that of the array elements and their output impedance matched that of the coaxial cable that connected to the scanner. Because the copolymer transducer had a broad bandwidth, the spectrum of the pulse echo image was modified by the frequency dependent attenuation of tissue and the bandpass of the ultrasound scanner, resulting in a center frequency of 2.5 MHz. The performance of the copolymer array was compared to that of a 3 MHz, PZT array with similar dimensions. On the Duke phased-array scanner, the copolymer sensitivity was 28 dB less than that of PZT. The copolymer elements had a 6 dB pulse-echo angular response of 30 degrees, and the interelement cross-coupling was -35 dB. Phased-array images were made of the heart of a 25 year-old normal male.


Ultrason Imaging


Ultrasonic imaging


Goldberg RL,Smith SW,Brown LF




Has Abstract


1992-07-01 00:00:00












  • In vivo study of online liver tissue classification based on envelope power spectrum analysis.

    abstract::An ultrasonic imaging and signal analysis system, combining a 3.5 MHz linear array B-scanner and an array processor, has been realized for a clinical liver tissue classification study. Based on the complete unprocessed rf data set of a real time B-image, local envelope power spectra averaged over interactively defined...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Lang M,Ermert H,Heuser L

    更新日期:1994-04-01 00:00:00

  • Digital simulation of pulsed ultrasonic waveforms.

    abstract::When modeling or simulating an ultrasonic pulse-echo system it is necessary to know the transducer waveforms that are the input to the system. In general, accurate transducer modeling is complex and waveform calculation is computationally intensive. Because of this, investigators often assume these waveforms to be sim...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Barber FE,Goodsitt MM

    更新日期:1987-10-01 00:00:00

  • Subharmonic contrast microbubble signals for noninvasive pressure estimation under static and dynamic flow conditions.

    abstract::Our group has proposed the concept of subharmonic aided pressure estimation (SHAPE) utilizing microbubble-based ultrasound contrast agent signals for the noninvasive estimation of hydrostatic blood pressures. An experimental system for in vitro SHAPE was constructed based on two single-element transducers assembled co...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Halldorsdottir VG,Dave JK,Leodore LM,Eisenbrey JR,Park S,Hall AL,Thomenius K,Forsberg F

    更新日期:2011-07-01 00:00:00

  • Computerized quantification analysis of left ventricular wall motion from echocardiograms.

    abstract::Two-dimensional echocardiography (2-D echo) imaging is a more attractive clinical tool than other modalities that either involve radiation exposure or are too slow to image heart motion in real-time. Computer-aided analysis of left ventricular(LV) wall motion provides quantitative parameters for diagnosis. This study ...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Chen T,Chen TP,Tsai LM

    更新日期:1997-04-01 00:00:00

  • Reconstructive ultrasound elasticity imaging for renal transplant diagnosis: kidney ex vivo results.

    abstract::It may be possible to diagnose and monitor scarring, inflammation and edema in transplant kidney using reconstructive ultrasound elasticity imaging. Kidney elasticity is expected to change dramatically with scar, and to a lesser degree, with acute inflammation and edema. The hypothesis that changes in kidney elasticit...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Emelianov SY,Lubinski MA,Skovoroda AR,Erkamp RQ,Leavey SF,Wiggins RC,O'Donnell M

    更新日期:2000-07-01 00:00:00

  • A study of the display pixel-based focusing method in ultrasound imaging.

    abstract::This paper presents a new beamforming technique, in which ultrasound waves are focused at the display pixels on the Cartesian coordinates, rather than sampling points located on the uniformly-separated scanlines on either the polar or Cartesian coordinates. Consequently, this method does not require a digital scan con...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Hwang JS,Song TK

    更新日期:2001-01-01 00:00:00

  • Mean scatterer spacing estimation in normal and thermally coagulated ex vivo bovine liver.

    abstract::The liver has been hypothesized to have a unique arrangement of microvasculature that presents as an arrangement of quasiperiodic scatterers to an interrogating ultrasound pulse. The mean scatterer spacing (MSS) of these quasiperiodic scatterers has been proposed as a useful quantitative ultrasound biomarker for chara...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Rubert N,Varghese T

    更新日期:2014-04-01 00:00:00

  • Classification of scattering objects by regular arrays of scatterers using Fourier analysis.

    abstract::For a class of scattering objects the mean separation between the scatterers is determined. Over a range of frequencies, ultrasonic back-scattered pressure signals are recorded. It is suggested to derive the mean spacing of an unknown scattering object by employing Fourier analysis and comparing the signal with signal...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Koch I

    更新日期:1983-10-01 00:00:00

  • Ultrasound attenuation measurements of the liver in vivo using a commercial sector scanner.

    abstract::Attenuation measurements of various tissue mimicking phantoms and three different groups of patients were obtained using a modified commercial sector scanner. Estimates of attenuation were made using the spectral shift method with mean frequencies at different depths of a region of interest being obtained by both zero...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Garra BS,Shawker TH,Nassi M,Russell MA

    更新日期:1984-10-01 00:00:00

  • Improved Fourier-transform-based parallel receive beam formation.

    abstract::A Fourier transform (FT)-based technique for forming parallel receive beams has been previously employed to increase the imaging frame rate in ultrasonic imaging. However, the image quality in FT-based parallel reconstruction is degraded because differences in range focusing delays are ignored and a wide transmit beam...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Li ML,Li PC

    更新日期:2003-04-01 00:00:00

  • Skeletal Muscle Fatigue State Evaluation with Ultrasound Image Entropy.

    abstract::Muscle fatigue often occurs over a long period of exercise, and it can increase the risk of muscle injury. Evaluating the state of muscle fatigue can avoid unnecessary overtraining and injury of the muscle. Ultrasound imaging can non-invasively visualize muscle tissue in real-time. Image entropy is commonly used to ch...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Li P,Yang X,Yin G,Guo J

    更新日期:2020-11-01 00:00:00

  • Toward Noninvasive Mapping of Diffuse Scattering in the Presence of Motion.

    abstract::Ultrasonic coda wave analysis techniques localize defects in fields such as seismography and nondestructive testing. In medical ultrasound, these techniques might provide novel mapping of tissue properties in diseases characterized by local fibrosis. In this work, we present an approach for localizing variation in sca...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Lindsey BD,Collins GC

    更新日期:2020-01-01 00:00:00

  • Statistical relationship between ultrasound echo envelope and envelope peak.

    abstract::This study shows that the amplitude information of ultrasound echoes is carried mainly by the envelope peaks (EPs). It is first shown that the EPs in an A-line represent the maximum number of independent amplitude data. It is then demonstrated that the entire envelope could be approximately reconstructed from the EPs....

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: He P

    更新日期:1988-10-01 00:00:00

  • Autoregressive spectral estimation in ultrasonic scatterer size imaging.

    abstract::An autoregressive (AR) spectral estimation method was considered for the purpose of estimating scatterer size images. The variance and bias of the resulting estimates were compared with those using classical FFT periodograms for a range of input signal-to-noise ratios and echo-signal durations corresponding to various...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Chaturvedi P,Insana MF

    更新日期:1996-01-01 00:00:00

  • Phase-derivative imaging. II: Effects of beam diffraction and scatterer density.

    abstract::The potential of using the phase derivative (PD) of the radio-frequency echograms for producing 2-dimensional grey scale images was further investigated. The PD images were produced by five different algorithms, which according to the results described in the companion paper yield PD images dominated by the amplitude ...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Oosterveld BJ,Romijn RL,Thijssen JM

    更新日期:1989-07-01 00:00:00

  • A Variance-reduction Approach to Detection of the Thyroid-nodule Boundary on Ultrasound Images.

    abstract::To perform computer-aided diagnosis of the thyroid nodules on ultrasound images, the location and boundary of nodules should be clearly defined. However, the identification of thyroid nodule boundary is a difficult issue due to the biological characteristics of the nodules, the physics and quality of ultrasound imagin...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Chiu LY,Chen A

    更新日期:2019-07-01 00:00:00

  • Breast tissue classification using diagnostic ultrasound and pattern recognition techniques: II. Experimental results.

    abstract::The methods of statistical pattern recognition have been applied to the problem of in vivo ultrasonic characterization of breast disease in humans. Backscattered A-mode signals obtained from a commercial pulse imaging system were used to generate a large set of potentially useful features. Using statistical tests, a s...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Finette S,Bleier AR,Swindell W,Haber K

    更新日期:1983-01-01 00:00:00

  • An efficient motion estimation and compensation method for ultrasound synthetic aperture imaging.

    abstract::This paper describes a method for overcoming motion artifacts in synthetic aperture imaging. The method is based on a computer simulation study on the influence of target motion on synthetic aperture techniques. A region-based motion compensation approach is used in which only the axial motion is estimated and compens...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Kim KS,Hwang JS,Jeong JS,Song TK

    更新日期:2002-04-01 00:00:00

  • Mathematical simulation of pressure pulse propagation in biological tissues.

    abstract::The propagation of pressure pulses of arbitrary time form in inhomogeneous attenuating media with characteristics similar to real biological tissues is considered. A mathematical model using the quasi-optical approximation is developed to solve the wave equation. Such a model proves to be convenient for computer reali...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Adrov VN,Chernomordik VV

    更新日期:1993-01-01 00:00:00

  • Characterization of tongue shape.

    abstract::Mathematical techniques are described for analyzing tongue shapes obtained with ultrasound images. The surface of the mid-sagittal section of the tongue was approximated by discrete points. In turn, these points were used to approximate position, slope and curvature of the tongue surface at a fixed time during speech....

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Morrish KA,Stone M,Sonies BC,Kurtz D,Shawker T

    更新日期:1984-01-01 00:00:00

  • Effective scatterer diameter estimates for broad scatterer size distributions.

    abstract::Acoustic form factors have been used to model the frequency dependence of acoustic scattering in phantoms and tissues. This work demonstrates that a broad range of scatterer sizes, individually well represented by Faran theory or a Gaussian form factor, is not accurately described by a single effective scatterer from ...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Nordberg EP,Hall TJ

    更新日期:2015-01-01 00:00:00

  • A comparison method for mean frequency estimators for Doppler ultrasound.

    abstract::Mean frequency estimators as used in pulsed Doppler ultrasound equipment should provide an accurate (quality) and consistent (robustness) estimate over a wide range of signal conditions. In a simplified signal model, the main parameters to consider are the noise level, mean frequency, bandwidth and power of both the D...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Brands PJ,Hoeks AP

    更新日期:1992-10-01 00:00:00

  • A quantitative approach to speckle reduction via frequency compounding.

    abstract::Coherent speckle is a source of image noise in ultrasonic B-mode imaging. The use of multiple imaging frequencies has been suggested as a technique for speckle contrast reduction. This technique involves the averaging of images whose speckle patterns have been modified by a change in the spectrum of the transmitted or...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Trahey GE,Allison JW,Smith SW,von Ramm OT

    更新日期:1986-07-01 00:00:00

  • Feasibility exploration of blood flow estimation by contrast-assisted Nakagami imaging.

    abstract::The microbubble contrast agent destruction/replenishment technique has been widely applied to ultrasound-based blood flow estimation. The rate of increase of the time-intensity curve (TIC) due to microbubbles flowing into the region of interest as measured from B-mode images closely reflects the flow velocity. In this...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Tsui PH,Yeh CK,Chang CC

    更新日期:2008-07-01 00:00:00

  • Transducer characterization from pressure amplitude distribution measurements using a Kalman filter as parameter estimation algorithm.

    abstract::The amplitude and frequency contents of a received ultrasound pulse depends on the spatial pressure amplitude distribution of the sound field, as produced by the transducer in the medium, and on the position and orientation of the reflecting surface in this field. Often, the geometry of the reflecting surface and the ...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Linssen FM,Hoeks AP

    更新日期:1990-10-01 00:00:00

  • Ultrasonic backscatter and attenuation (11-27 MHz) variation with collagen fiber distribution in ex vivo human dermis.

    abstract::This ex vivo study explores the relationship of ultrasonic attenuation and backscatter to dermal microarchitecture by comparing ultrasonic measurements of these parameters (11-27 MHz) to a microscopic analysis of three parameters describing the collagen distribution (mean thickness and spacing of collagen bundles alon...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Bridal SL,Fournier C,Coron A,Leguerney I,Laugier P

    更新日期:2006-01-01 00:00:00

  • Adaptive texture feature extraction with application to ultrasonic image analysis.

    abstract::Computer texture analysis methods use texture features that are traditionally chosen from a large set of fixed features known in literature. These fixed features are often not specifically designed to the problem at hand, and as a result they may have low discriminative power, and/or may be correlated. Increasing the ...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章,评审


    authors: Huisman HJ,Thijssen JM

    更新日期:1998-04-01 00:00:00

  • Phase-derivative imaging. I: Methods and stabilization analysis.

    abstract::The potential of using the phase derivative (PD) for echographic imaging was investigated. The PD data were calculated by four methods: zero crossing (ZCS) with squelch addition, analytic signal either with squelch addition (ASS) or with employment of a Wiener kernel (ASW), and unwrapped phase (UWP). The large peaks w...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Romijn RL,Oosterveld BJ,Thijssen JM

    更新日期:1987-07-01 00:00:00

  • Frequency diversity speckle processing.

    abstract::Ultrasonic waveform data from a tissue-mimicking phantom containing low contrast targets was digitized, stored and processed prior to creating and displaying ultrasonic images. Speckle reduction was performed by digital filtering of the waveform data with appropriately spaced and weighted digital filters, prior to bot...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Gehlbach SM,Sommer FG

    更新日期:1987-04-01 00:00:00

  • Optimal transmit phasing for harmonic-background suppression with bipolar square-wave pulser.

    abstract::Optimal transmit phasing has been proposed to increase contrast-to-tissue ratio (CTR) by relatively phasing the tissue and leakage harmonic components to cancel each other out for tissue-background suppression in harmonic imaging. Since most clinical systems are only equipped with a bipolar square-wave pulser, effecti...

    journal_title:Ultrasonic imaging

    pub_type: 杂志文章


    authors: Shen CC,Yang YC,Chen WS

    更新日期:2010-01-01 00:00:00