Shear Wave Speed Measurement Using an Unfocused Ultrasound Beam

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

Tissue elasticity is related to pathology and, therefore, has important medical applications. Radiation force from a focused ultrasound beam has been used to produce shear waves in tissues for shear wave speed and tissue elasticity measurements. The feasibility of shear wave speed measurement using radiation force for an unfocused ultrasound beam is demonstrated in this study with a linear and a curved array transducer. Consistent measurement of shear wave speed was achieved over a relatively long axial extent (z = 10-40 mm for the linear array, and z = 15-60 mm for the curved array) in three calibrated phantoms with different shear moduli. In vivo measurements on the biceps of a healthy volunteer show consistent increase of shear wave speed for the biceps under 0, 1, 2 and 3 kg loading. Advantages and limitations of unfocused push are discussed.

Original languageEnglish (US)
Pages (from-to)1646-1655
Number of pages10
JournalUltrasound in Medicine and Biology
Volume38
Issue number9
DOIs
StatePublished - Sep 2012

Keywords

  • Elasticity
  • Shear wave
  • Ultrasound radiation force
  • Unfocused

ASJC Scopus subject areas

  • Biophysics
  • Radiological and Ultrasound Technology
  • Acoustics and Ultrasonics

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