Two-dimensional temperature estimation using diagnostic ultrasound

Claudio Simon, Philip Vanbaren, Emad S. Ebbini

Research output: Contribution to journalArticlepeer-review

351 Scopus citations

Abstract

A two-dimensional temperature estimation method was developed based on the detection of shifts in echo location of backscattered ultrasound from a region of tissue undergoing thermal therapy. The echo shifts are due to the combination of the local temperature dependence of speed of sound and thermal expansion in the heated region. A linear relationship between these shifts and the underlying tissue temperature rise is derived from first principles and experimentally validated. The echo shifts are estimated from the correlation of successive backscattered ultrasound frames, and the axial derivative of the accumulated echo shifts is shown to be proportional to the temperature rise. Sharp lateral gradients in the temperature distribution introduce ripple on the estimates of the echo shifts due to a thermo-acoustic lens effect. This ripple can be effectively reduced by filtering the echo shifts along the axial and lateral directions upon differentiation. However, this is achieved at the expense of spatial resolution. Experimental evaluation of the accuracy (0.5°C) and spatial resolution (2 mm) of the algorithm in tissue mimicking phantoms was conducted using a diagnostic ultrasound imaging scanner and a therapeutic ultrasound unit. The estimated temperature maps were overlaid on the gray-scale ultrasound images to illustrate the applicability of this technique for image guidance of focused ultrasound thermal therapy.

Original languageEnglish (US)
Pages (from-to)1088-1099
Number of pages12
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume45
Issue number4
DOIs
StatePublished - 1998

Bibliographical note

Funding Information:
Manuscript received September 5, 1997; accepted April 9, 1998. This work was partially funded by NSF Young Investigator Award ECS 9358301, NIH Grant CA66602, and the O ce of Vice President for Research at University of Michigan. CAPES/Brazil partially supported the rst author during his graduate studies.

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