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Journal Cover   Ultrasonic Imaging
  [SJR: 0.818]   [H-I: 34]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0161-7346 - ISSN (Online) 1096-0910
   Published by Sage Publications Homepage  [821 journals]
  • 40th International Symposium on Ultrasonic Imaging and Tissue
           Characterization, Program and Abstracts
    • PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734615602622
      Issue No: Vol. 37, No. 4 (2015)
  • Reproducibility of Acetabular Landmarks and a Standardized Coordinate
           System Obtained from 3D Hip Ultrasound
    • Authors: Mabee, M; Dulai, S, Thompson, R. B, Jaremko, J. L.
      Pages: 267 - 276
      Abstract: Two-dimensional (2D) ultrasound detection of developmental dysplasia of the hip (DDH) is limited by variation in acetabular appearance and alpha angle measurements, which change with position of the ultrasound probe. Three-dimensional (3D) ultrasound captures the entire acetabular shape, and a reproducible "standard central plane" may be generated, from two landmarks located on opposite ends of the acetabulum, for measurement of alpha angle and other indices. Two users identified landmarks on 51 3D ultrasounds, with ranging severity of disease, and inter- and intra-observer reproducibility of landmark and "standard plane" locations was compared; landmarks were chosen within 2 mm, and the "standard plane" rotation was reproducible within 10° between observers. We observed no difference in variability between alpha angles measured on the "standard plane" in comparison with 2D ultrasound. Applications of the standardized 3D ultrasound central plane will be to fuse serial ultrasounds for follow-up and development of new indices of 3D deformity.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614558278
      Issue No: Vol. 37, No. 4 (2015)
  • A PDE-Based Regularization Algorithm Toward Reducing Speckle Tracking
           Noise: A Feasibility Study for Ultrasound Breast Elastography
    • Authors: Guo, L; Xu, Y, Xu, Z, Jiang, J.
      Pages: 277 - 293
      Abstract: Obtaining accurate ultrasonically estimated displacements along both axial (parallel to the acoustic beam) and lateral (perpendicular to the beam) directions is an important task for various clinical elastography applications (e.g., modulus reconstruction and temperature imaging). In this study, a partial differential equation (PDE)–based regularization algorithm was proposed to enhance motion tracking accuracy. More specifically, the proposed PDE-based algorithm, utilizing two-dimensional (2D) displacement estimates from a conventional elastography system, attempted to iteratively reduce noise contained in the original displacement estimates by mathematical regularization. In this study, tissue incompressibility was the physical constraint used by the above-mentioned mathematical regularization. This proposed algorithm was tested using computer-simulated data, a tissue-mimicking phantom, and in vivo breast lesion data. Computer simulation results demonstrated that the method significantly improved the accuracy of lateral tracking (e.g., a factor of 17 at 0.5% compression). From in vivo breast lesion data investigated, we have found that, as compared with the conventional method, higher quality axial and lateral strain images (e.g., at least 78% improvements among the estimated contrast-to-noise ratios of lateral strain images) were obtained. Our initial results demonstrated that this conceptually and computationally simple method could be useful for improving the image quality of ultrasound elastography with current clinical equipment as a post-processing tool.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614561128
      Issue No: Vol. 37, No. 4 (2015)
  • Generalization of Multipulse Transmission Techniques for Ultrasound
    • Authors: Lin, F; Cachard, C, Varray, F, Basset, O.
      Pages: 294 - 311
      Abstract: To increase the contrast-to-tissue ratio (CTR) in contrast imaging or the signal-to-noise ratio (SNR) in tissue harmonic imaging, many multipulse transmission techniques have been suggested. This article first recalls the various imaging techniques proposed in the literature and then presents a mathematical background to synthesize and generalize most of the multipulse ultrasound imaging techniques. The formulation presented can be used to predict the relative amplitude of the nonlinear components in each frequency band and to design new transmission sequences to either increase or decrease specified nonlinear components in each harmonic band. Simulation results on several multipulse techniques agree with the results from previous studies.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614566696
      Issue No: Vol. 37, No. 4 (2015)
  • The Role of Acoustic Radiation Force Impulse Elastography in the
           Differentiation of Infectious and Neoplastic Liver Lesions
    • Authors: Goya, C; Hamidi, C, Yavuz, A, Hattapoglu, S, Uslukaya, O, Cetincakmak, M. G, Teke, M, Urakci, Z.
      Pages: 312 - 322
      Abstract: We aimed to evaluate the effectiveness of acoustic radiation force impulse (ARFI) elastography in differentiating between hepatic lesions. The prospective study included 117 patients with liver masses. Shear wave velocity (SWV) values for lesions were determined by ARFI imaging and compared statistically. The difference between SWV values for benign and malignant hepatic masses was significant (p < 0.01). The threshold SWV value for malignant hepatic lesions was established at 2.52 m/s, and the sensitivity and specificity of this cut-off value were 97% and 66%, respectively. We concluded that ARFI elastography provides supplementary data that aid in the differential diagnosis of liver masses.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614566697
      Issue No: Vol. 37, No. 4 (2015)
  • Shear Wave Wavefront Mapping Using Ultrasound Color Flow Imaging
    • Authors: Yamakoshi, Y; Kasahara, T, Iijima, T, Yuminaka, Y.
      Pages: 323 - 340
      Abstract: A wavefront reconstruction method for a continuous shear wave is proposed. The method uses ultrasound color flow imaging (CFI) to detect the shear wave’s wavefront. When the shear wave vibration frequency satisfies the required frequency condition and the displacement amplitude satisfies the displacement amplitude condition, zero and maximum flow velocities appear at the shear wave vibration phases of zero and rad, respectively. These specific flow velocities produce the shear wave’s wavefront map in CFI. An important feature of this method is that the shear wave propagation is observed in real time without addition of extra functions to the ultrasound imaging system. The experiments are performed using a 6.5 MHz CFI system. The shear wave is excited by a multilayer piezoelectric actuator. In a phantom experiment, the shear wave velocities estimated using the proposed method and those estimated using a system based on displacement measurement show good agreement.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614568532
      Issue No: Vol. 37, No. 4 (2015)
  • Crawling Waves Speed Estimation Based on the Dominant Component Analysis
    • Authors: Rojas, R; Ormachea, J, Salo, A, Rodriguez, P, Parker, K. J, Castaneda, B.
      Pages: 341 - 355
      Abstract: A novel method for estimating the shear wave speed from crawling waves based on the amplitude modulation–frequency modulation model is proposed. Our method consists of a two-step approach for estimating the stiffness parameter at the central region of the material of interest. First, narrowband signals are isolated in the time dimension to recover the locally strongest component and to reject distortions from the ultrasound data. Then, the shear wave speed is computed by the dominant component analysis approach and its spatial instantaneous frequency is estimated by the discrete quasi-eigenfunction approximations method. Experimental results on phantoms with different compositions and operating frequencies show coherent speed estimations and accurate inclusion locations.
      PubDate: 2015-09-21T00:19:42-07:00
      DOI: 10.1177/0161734614568651
      Issue No: Vol. 37, No. 4 (2015)
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