A Study of Near Field Ultrasonic Beam Patterns from a Pulsed Linear Array

  • E. B. Miller
  • S. W. Smith
  • F. L. Thurstone


A major advantage of pulse-echo imaging in the near-field of an acoustic array is the improved lateral resolution that focusing makes possible. Usually, equivalence is tacitly assumed between a lateral beam dimension for continuous wave excitation and a lateral pulse dimension for the same geometry. Although distinctions certainly exist between the lateral dimensions in these two cases, it is convenient in dealing with pulsed ultrasound to speak of a “beam” or “beams” of ultrasonic energy. By analogy to the continuous wave case, such a beam may be defined as the envelope of a pulse dimension. This dimension may be specified by some absolute or r.m.s. pressure magnitude criterion (e.g., the distance to a point at which the absolute pressure is down “n” dB from the maximum value in the field).


Pressure Field Pulse Length Line Source Lateral Resolution Array Element 
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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • E. B. Miller
    • 1
  • S. W. Smith
    • 1
  • F. L. Thurstone
    • 1
  1. 1.Department of Biomedical EngineeringDuke UniversityDurhamUSA

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