Anisotropy of apparent backscatter in the short-axis view of mouse hearts

Mark R. Holland, Attila Kovacs, Stephanie H. Posdamer, Kirk D. Wallace, James G. Miller

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The goals of this investigation were to measure the anisotropy of backscattered ultrasound observed in the short-axis view of mouse hearts in systole and diastole and to compare these measurements with predictions from a computer simulation. Measurements of midmyocardial apparent backscatter were obtained from analyses of the hearts of seven wild-type mice using a clinical imaging system utilizing a linear array with a nominal center frequency of 13 MHz. A computer model simulating the short-axis view was implemented based on previous measurements of the angle of insonification dependence of myocardial backscatter and attenuation. Results demonstrate that the measured backscatter was largest for those myocardial regions corresponding to approximately perpendicular insonification relative to the myofibers and the smallest for regions of approximately parallel insonification, with the minimum to maximum values of apparent backscatter differing by approximately 10 dB. The measured anisotropy of backscatter was similar for end-systole and end-diastole and was in good agreement with the predicted anisotropy obtained from the computer simulations.

Original languageEnglish
Pages (from-to)1623-1629
Number of pages7
JournalUltrasound in Medicine and Biology
Volume31
Issue number12
DOIs
StatePublished - Dec 2005

Keywords

  • Anisotropy
  • Apparent backscatter
  • Fiber orientation
  • Heart
  • Mouse
  • Myocardium
  • Ultrasonic tissue characterization

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