Total attenuation compensation for backscatter coefficient estimation using full angular spatial compounding in physical phantoms

Andres Coila, Julien Rouyer, Omar Zenteno, Adam Luchies, Michael L. Oelze, Roberto Lavarello

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The backscatter coefficient (BSC) quantifies the frequency-dependent reflectivity of tissues. Accurate estimation of the BSC requires knowledge of the attenuation coefficient slope (ACS) of tissues in the beam path between the transducer and the insonified region of interest, namely, the total attenuation. In this study, the total attenuation is calculated as the cumulative sum of values of a local attenuation map devised using full angular spatial compounding (FASC). The BSC was parameterized through the integrated backscatter coefficient (iBSC) obtaining iBSC maps. Experimental validation of the proposed approach consisted of scanning two cylindrical physical phantoms with off-centered inclusions having different ACS and BSC values than the background. Additional iBSC maps were computed assuming an uniform ACS map of 0.5 dB/cm/MHz (which is a value assumed for soft tissues) instead of the FASC-ACS map. Finally a iBSC map was obtained using an ideal ACS map formed with ground truth ACS values and knowledge of inclusion true position. The results were comparable when using the FASC-ACS map or the ideal ACS map in term of inclusion detectability and estimation accuracy. The use of the uniform ACS map resulted in some cases with very high fractional error (>9 dB), which highlights the relevance of accurate compensation for total attenuation. These results suggest that BSCs can be reliably estimated using total attenuation compensation from FASC-ACS maps.

Original languageEnglish (US)
Title of host publicationMedical Imaging 2021
Subtitle of host publicationUltrasonic Imaging and Tomography
EditorsBrett C. Byram, Nicole V. Ruiter
PublisherSPIE
ISBN (Electronic)9781510640337
DOIs
StatePublished - 2021
EventMedical Imaging 2021: Ultrasonic Imaging and Tomography - Virtual, Online, United States
Duration: Feb 15 2021Feb 19 2021

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume11602
ISSN (Print)1605-7422

Conference

ConferenceMedical Imaging 2021: Ultrasonic Imaging and Tomography
CountryUnited States
CityVirtual, Online
Period2/15/212/19/21

Keywords

  • Backscatter coefficient
  • Full angular spatial compounding
  • Spectral-log-difference
  • Total attenuation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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