Now showing items 1-7 of 7

    • An adaptive speckle suppression filter for medical ultrasound imaging 

      Karaman, M.; Kutay, M. A.; Bozdagi, G. (Institute of Electrical and Electronics Engineers, 1995-06)
      An adaptive smoothing technique for speckle suppression in medical B-scan ultrasonic imaging is presented. The technique is based on filtering with appropriately shaped and sized local kernels. For each image pixel, a ...
    • Enhancement of images corrupted with signal dependent noise: Application to ultrasonic imaging 

      Kutay, M.A.; Karaman, M.; Bozdagi G. (1993)
      An adaptive filter for smoothing images corrupted by signal dependent noise is presented. The filter is mainly developed for speckle suppression in medical B-scan ultrasonic imaging. The filter is based on mean filtering ...
    • Micromachinable leaky wave air transducers 

      Degertekin, F. L.; Atalar, Abdullah; Khuri-Yakub, B. T. (IEEE, 1997-11)
      In this paper, ultrasonic air transducers which use the lowest order antisymmetric (A/sub 0/) mode Lamb waves in a thin plate as a means of efficient coupling of ultrasonic energy to air are discussed. For a silicon plate ...
    • A phase aberration correction method for ultrasound imaging 

      Karaman, M.; Atalar, Abdullah; Köymen, H.; O'Donnell, M. (IEEE, 1993)
      A computationally efficient method for phase aberration correction in ultrasound imaging is presented. The method is based on time delay estimation via minimization of the sum of absolute differences between radio frequency ...
    • Reduction of effects of inactive array elements in phase aberration correction 

      Karaman, M.; Koymen H.; Atalar, Abdullah; O'Donnell, M. (IEEE, 1993)
      Phase aberration correction based on time delay estimation via minimization of sum of absolute difference (SAD) between radio frequency (RF) signals of neighboring elements is studied in the presence of missing elements. ...
    • VLSI circuits for adaptive digital beamforming in ultrasound imaging 

      Karaman, M.; Atalar, Abdullah; Köymen, H. (IEEE, 1993)
      For phased-array ultrasound imaging, alternative beamforming techniques and their VLSI circuits are studied to form a fully digital receive front-end hardware. In order to increase the timing accuracy in beamforming, a ...
    • A VLSI receive beamformer for digital ultrasound imaging 

      Karaman, M.; Kolagasioglu, E.; Atalar, Abdullah (IEEE, 1992-03)
      A VLSI architecture for real-time digital receive beamforming in phased array ultrasound imaging is proposed. The architecture is an inverse binary tree like structure with N stages where N is the number of array elements. ...