Real-Time Spatiotemporal Control of High-Intensity Focused Ultrasound Thermal Ablation Using Echo Decorrelation Imaging in ex Vivo Bovine Liver

Ultrasound in Medicine & Biology
Mohamed A AbbassT Douglas Mast

Abstract

The ability to control high-intensity focused ultrasound (HIFU) thermal ablation using echo decorrelation imaging feedback was evaluated in ex vivo bovine liver. Sonications were automatically ceased when the minimum cumulative echo decorrelation within the region of interest exceeded an ablation control threshold, determined from preliminary experiments as -2.7 (log-scaled decorrelation per millisecond), corresponding to 90% specificity for local ablation prediction. Controlled HIFU thermal ablation experiments were compared with uncontrolled experiments employing two, five or nine sonication cycles. Means and standard errors of the lesion width, area and depth, as well as receiver operating characteristic curves testing ablation prediction performance, were computed for each group. Controlled trials exhibited significantly smaller average lesion area, width and treatment time than five-cycle or nine-cycle uncontrolled trials and also had significantly greater prediction capability than two-cycle uncontrolled trials. These results suggest echo decorrelation imaging is an effective approach to real-time HIFU ablation control.

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Citations

Jul 12, 2018·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Mohamed A AbbassT Douglas Mast
Nov 9, 2018·Network : Computation in Neural Systems·M E Karar, M A El-Brawany
Dec 14, 2018·Physics in Medicine and Biology·Jason L RaymondRonald A Roy
Jun 3, 2021·Annals of Biomedical Engineering·Ramy AbdlatyAhmed M Awadallah

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