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Medical & Biological Engineering

, Volume 11, Issue 1, pp 27–32 | Cite as

Physical sources of registration erros in pulse-echo ultrasonic systems

Part I-velocity and attenuation
  • M. Halliwell
  • R. A. Mountford
Article

Abstract

The extent to which ultrasonic beams are distorted under normal contact-scanning conditions has been investigated. It has been shown that considerable deformation of the beam occurs on passage through a human calf. Deviation and divergence effects are small, but the deformation could lead to registration errors of the order of 20 mm in standard diagnostic ultrasonic equipment.

Keywords

Utrasound 

Sommaire

La mesure dans laquelle les faisceaux d'ultrasons sont déformés dans des conditions normales d'analyse par contact a été étudiée. Il a été démontré qu'il se produit une déformation considérable du faisceau lors de son passage à travers le mollet humain. Les effects de déviation et de divergence sont réduits, mais le déformation peut mener à des erreurs de repérage de l'ordre de 20 mm dans le matériel de diagnostic standard aux ultrasons.

Zusammenfassung

Das Ausmass von Verzerrungen des Ultraschallstrahls unter normalen Kontaktabtast-bedingungen wurde untersucht. Es wurde gezeigt, dass erhebliche Strahlverzerrungen beim Durchtreten durch eine menschliche Wade erfolgt. Abweichungs- und Divergenzeffekte sind geringfügig, aber die Verzerrungen können zu Aufzeichnungsfehlern von ca. 20 mm in üblichem, diagnostischem Ultraschallgerät führen.

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Copyright information

© International Federation for Medical & Biological Engineering 1973

Authors and Affiliations

  • M. Halliwell
    • 1
  • R. A. Mountford
    • 2
  1. 1.Department of Medical PhysicsBristol General HospitalBristolEngland
  2. 2.Department of MedicineUniversity of BristolBristolEngland

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