Microvascular flow estimation by contrast-assisted ultrasound b-scan and statistical parametric images

Po Hsiang Tsui*, Chih Kuang Yeh, Chien Cheng Chang

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

21 Scopus citations

Abstract

The microbubbles destruction/replenishment technique has been previously applied to estimating blood flow in the microcirculation. The rate of increase of the time-intensity curve (TIC) due to microbubbles flowing into the region of interest (ROI), as measured from B-mode images, closely reflects the flow velocity. In previous studies, we proposed a new approach called the time-Nakagami-parameter curve (TNC) obtained from Nakagami images to monitor microbubble replenishment for quantifying the microvascular flow velocity. This study aimed to further explore some effects that may affect the TNC to estimate the microflow, including microbubble concentration, ultrasound transmitting energy, attenuation, intrinsic noise, and tissue clutter. In order to well control each effect production, we applied a typical simulation method to investigate the TIC and TNC. The rates of increase of the TIC and TNC were expressed by the rate constants βI and βN, respectively, of a monoexponential model. The results show that βN quantifies the microvascular flow velocity similarly to the conventional βI. Moreover, the measures of βI and βN are not influenced by microbubble concentration, transducer excitation energy, and attenuation effect. Although the effect of intrinsic signals contributed by noise and blood would influence the TNC behavior, the TNC method has a better tolerance of tissue clutter than the TIC does, allowing the presence of some clutter components in the ROI. The results suggest that the TNC method can be used as a complementary tool for the conventional TIC to reduce the wall filter requirements for blood flow measurement in the microcirculation.

Original languageEnglish
Pages (from-to)360-369
Number of pages10
JournalIEEE Transactions on Information Technology in Biomedicine
Volume13
Issue number3
DOIs
StatePublished - 2009
Externally publishedYes

Keywords

  • Blood flow
  • Contrast agent
  • Microbubble
  • Nakagami parameter

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