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 


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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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