A swept-scanning mode for estimation of blood velocity in the microvasculature

Dustin E. Kruse, Ronald H. Silverman, Rafael J. Fornaris, D. Jackson Coleman, Katherine W. Ferrara

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

In contrast to previous systems in which an ultrasonic pulse wass repeatedly directed to a discrete line of sight, a new method has been developed to continuously scan over a region in order to rapidly assess blood velocities in superficial small blood vessels. Using this technique, which we call swept-scan, a high frequency transducer can rapidly translate across a region of interest, and sensitive maps of blood velocity in small blood vessels can be constructed. This system has been applied to flow mapping in the anterior segment of the eye, which is clinically significant in cases of trauma and glaucoma. No previous imaging technique has been capable of estimating blood velocities within this region in a clinically useful manner. With this new technique, each 2-D scan of the eye can be obtained in an interval on the order of 1 second, and blood flow through the iris and ciliary body can be detected in vessels as small as 40 microns. A major implication of this new technique is that a wall filter can be applied continuously to the return from all regions, thus eliminating the transient response that occurs along each line of sight in traditional Doppler systems.

Original languageEnglish (US)
Pages (from-to)1437-1443
Number of pages7
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume45
Issue number6
DOIs
StatePublished - 1998
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Acoustics and Ultrasonics

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