A CT based correction method for speed of sound aberration for ultrasound based image guided radiotherapy

  • Fontanarosa D
  • Van Der Meer S
  • Harris E
 et al. 
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Abstract

To introduce a correction for speed of sound (SOS) aberrations in three dimensional (3D) ultrasound (US) imaging systems for small but systematic positioning errors in image guided radiotherapy (IGRT) applications. US waves travel at different speeds in different human tissues. Conventional US-based imaging systems assume that SOS is constant in all tissues at 1540 m/s which is an accepted average value for soft tissues. This assumption leads to errors of up to a few millimeters when converting echo times into distances and is a source of systematic errors and image distortion in quantitative US imaging.

Author-supplied keywords

  • CT imaging
  • IGRT
  • distance error
  • radiotherapy
  • speed of sound
  • ultrasound imaging

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