Methods for Increasing the Lateral Resolution of B-Scan

  • C. B. Burckhardt
  • P.-A. Grandchamp
  • H. Hoffmann


B-scan displays a picture of a cross-section through the body and is widely used in ultrasonic diagnosis. The main deficiency of B-scan is the low lateral resolution, which has its origin in the large diameter of the ultrasound beam.

The first system to be described is a synthetic aperture sonar system working at 2 MHz (λ = 0.75 mm in water) . The important features of the system and the optical processing are given. A second system uses an annular transducer for focussing the ultrasound beam over a depth of 20 cm. The side lobes are reduced by subtracting an echo signal from a second pulse which contains echoes from reflectors in the region of the side lobes only. All systems have a lateral resolution of 2–3 mm and are thus almost one order of magnitude better than conventional B-scan.


Point Spread Function Lateral Resolution Side Lobe Zone Plate Fresnel Zone Plate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • C. B. Burckhardt
    • 1
  • P.-A. Grandchamp
    • 1
  • H. Hoffmann
    • 1
  1. 1.F. Hoffmann-La Roche & Co., AGBaselSwitzerland

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