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Array elevation requirements in phase aberration correction using an 8×128 1.75D array

Publication ,  Journal Article
Fernandez, AT; Dahl, JJ; Dumont, DM; Trahey, GE
Published in: Proceedings of SPIE - The International Society for Optical Engineering
January 1, 2002

Accurate measurement of tissue aberrations is necessary for effective adaptive ultrasound imaging. Higher order arrays provide more elements and a larger array footprint over which echo signals can be acquired. This allows for better sampling of the aberrator in both the azimuthal and elevation dimensions. These measured aberration profiles can then be used to correct the timing of transmitted and received RF signals to generate new images. We acquired single channel RF data on a 6.7 MHz, 8 × 128 array (Tetrad Co.) operating at F/1.0 in azimuth and F/2.9 in elevation. This array was interfaced to a Siemens Elegra scanner, allowing for data acquisition during routine phantom and clinical scanning. One-dimensional and two-dimensional physical near-field aberrators were used while imaging speckle only and spherical cyst-mimicking phantoms. In some experiments, neighboring elements were electronically tied in elevation to form "taller" elements. We collected individual channel data on each of 6 physical rows and then on a combination of rows to form 3×128, 2×128, and 1×128 arrays over a 6×128 aperture of the array. A least-mean-squares algorithm was employed to estimate the arrival time error induced by the tissue for the different array geometries. These aberration measurements were used to correct the images. In addition, point target simulations were performed to characterize the algorithm's performance for all four different array configurations. We present the performance of the adaptive imaging algorithm and discuss methods of combining arrival time profiles from axial and lateral tissue regions to improve adaptive imaging performance. Contrast results in simulation and phantom experiments with different aberrators are presented. We also discuss, in the context of our aberration measurement profiles, the array geometry requirements for successful adaptive imaging and the effects of the aberrators on sidelobe strength and contrast measurement. Results from performing adaptive imaging on clinical breast images using a 6×128 array geometry are also presented.

Duke Scholars

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

January 1, 2002

Volume

4687

Start / End Page

79 / 90

Related Subject Headings

  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
 

Citation

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Fernandez, A. T., Dahl, J. J., Dumont, D. M., & Trahey, G. E. (2002). Array elevation requirements in phase aberration correction using an 8×128 1.75D array. Proceedings of SPIE - The International Society for Optical Engineering, 4687, 79–90. https://doi.org/10.1117/12.462188
Fernandez, A. T., J. J. Dahl, D. M. Dumont, and G. E. Trahey. “Array elevation requirements in phase aberration correction using an 8×128 1.75D array.” Proceedings of SPIE - The International Society for Optical Engineering 4687 (January 1, 2002): 79–90. https://doi.org/10.1117/12.462188.
Fernandez AT, Dahl JJ, Dumont DM, Trahey GE. Array elevation requirements in phase aberration correction using an 8×128 1.75D array. Proceedings of SPIE - The International Society for Optical Engineering. 2002 Jan 1;4687:79–90.
Fernandez, A. T., et al. “Array elevation requirements in phase aberration correction using an 8×128 1.75D array.” Proceedings of SPIE - The International Society for Optical Engineering, vol. 4687, Jan. 2002, pp. 79–90. Scopus, doi:10.1117/12.462188.
Fernandez AT, Dahl JJ, Dumont DM, Trahey GE. Array elevation requirements in phase aberration correction using an 8×128 1.75D array. Proceedings of SPIE - The International Society for Optical Engineering. 2002 Jan 1;4687:79–90.

Published In

Proceedings of SPIE - The International Society for Optical Engineering

DOI

ISSN

0277-786X

Publication Date

January 1, 2002

Volume

4687

Start / End Page

79 / 90

Related Subject Headings

  • 5102 Atomic, molecular and optical physics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering