A Phase Compensation Technique for B-Mode Echoencephalography

  • D. J. Phillips
  • S. W. Smith
  • O. T. von Ramm
  • F. L. Thurstone

Abstract

Whereas A-mode echoencephalography has been found diagnostically useful, B-mode displays for similar object volumes have not yet provided the additional information that might be expected from a two-dimensional presentation. Poor image quality results from a number of causes stemming from the presence of skull bone (White, 1967; 1968). Large differences in specific acoustic impedance between skull bone and soft tissue combined with irregularities of skull bone surfaces result in unfavorable reflections and reverberations of acoustic energy. Severe attenuation of ultrasound at diagnostically useful frequencies further reduces system sensitivity and target acquisition. Additionally, significant differences between acoustic velocities in bone and tissue result in beam degradation and registration errors in the B-mode image. With one possible exception (Somer, 1969), the nature and extent of these aberrations have thus far limited practical utilization of B-mode scanners in clinical examinations of head structure.

Keywords

Attenuation Propa Refraction Azimuth 

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References

  1. 1.
    White, D.N., Clark, J.M., and White, M.N., “Studies in Ultrasonic Echoencephalography-VII: General Principles of Recording Information In Ultrasonic B-and C-Scanning, and the Effects of Scatter, Reflection, and Refraction by Cadaver Skull on this Information,” Med. and Biol, Engrg, 5:3–14, 1967.CrossRefGoogle Scholar
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Copyright information

© American Institute of Ultrasound in Medicine and Plenum Press, New York 1975

Authors and Affiliations

  • D. J. Phillips
    • 1
  • S. W. Smith
    • 1
  • O. T. von Ramm
    • 1
  • F. L. Thurstone
    • 1
  1. 1.Department of Biomedical EngineeringDuke UniversityDurhamUSA

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