On the Relationship between Spatial Coherence and In Situ Pressure for Abdominal Imaging.

Journal Article (Journal Article)

Tissue harmonic signal quality has been shown to improve with elevated acoustic pressure. The peak rarefaction pressure (PRP) for a given transmit, however, is limited by the Food and Drug Administration guidelines for mechanical index. We have previously demonstrated that the mechanical index overestimates in situ PRP for tightly focused beams in vivo, due primarily to phase aberration. In this study, we evaluate two spatial coherence-based image quality metrics-short-lag spatial coherence and harmonic short-lag spatial coherence-as proxy estimates for phase aberration and assess their correlation with in situ PRP in simulations and experiments when imaging through abdominal body walls. We demonstrate strong correlation between both spatial coherence-based metrics and in situ PRP (R2  = 0.77 for harmonic short-lag spatial coherence, R2  = 0.67 for short-lag spatial coherence), an observation that could be leveraged in the future for patient-specific selection of acoustic output.

Full Text

Duke Authors

Cited Authors

  • Zhang, B; Pinton, GF; Nightingale, KR

Published Date

  • August 2021

Published In

Volume / Issue

  • 47 / 8

Start / End Page

  • 2310 - 2320

PubMed ID

  • 33985826

Pubmed Central ID

  • PMC8494065

Electronic International Standard Serial Number (EISSN)

  • 1879-291X

International Standard Serial Number (ISSN)

  • 0301-5629

Digital Object Identifier (DOI)

  • 10.1016/j.ultrasmedbio.2021.03.008


  • eng