Wednesday, 26 July 2017

NECESSITY OF UNIFORM ACOUSTIC LAYER ON ULTRASOUND PROBES
WHAT IS AN ACOUSTIC LAYER ?????

  • It is a gray (other colors also) colored part looking like rubber attached to the tip of the ultrasound probe.
  • It is the intermediate material between the piezoelectric material and the object.
  • Also called acoustic lens and matching layer (for some probes).
  • It is designed to have adequate acoustic impedance value using a combination of different resins and is deposited uniformly on the tip of the probe. 
  • The suggested membrane thickness is 0.0002 inches


WHAT ARE THE FUNCTIONS OF AN ACOUSTIC LAYER?

  • Maintain the acoustic impedance between the piezoelectric material and the object.
  • Prevent the ultrasound wave from spreading and focused them in a slice direction to improve the resolution (Beam focusing). 
  • Act as protection barrier for piezoelectric crystals.



WHAT HAPPENS IF THE LAYER IS NOT UNIFORM ????

  • Poor Beam focusing : If the layer is not uniform over the surface then the transmitted ultrasound wave get spread over the plane which will lead to decrease in resolution.
  • Impedance mismatch : Changes in thickness will create impedance difference
  • It devastatingly lengthens the ultrasound wave and ring down time. 



US IMAGE OF URINARY BLADDER BY A NON-UNIFORMLY LAYERED  PROBE

US IMAGE OF URINARY BLADDER BY UNIFORMLY LAYERED  PROBE
To know more about the acoustic lens and lens replacement call  9847069684

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