Abstract
Existence of accurate temporal-spatial temperature models, which would enable non-invasive estimates, will promote ultrasound-based thermal therapy applications. These models should reflect the tissue temperature with a maximum absolute error of 0.5 ºC within 1 cm3.
In-vitro experiments have been developed to evaluate the temperature variations induced by standard ultrasound therapeutic device emitting continuously on gel-based phantom and on pork meat tissue using three different emitting intensities (1, 1.5 and 2 W/cm3). Temperature estimates were performed based on raw RF data collected using a second ultrasound transducer (imaging transducer). This second transducer worked in pulse-echo mode, and was placed perpendicularly to the therapeutic transducer. In order to access the quality of the estimates, temperatures were acquired by five and by two thermocouples placed in the gel-based phantom and on the porcine sample, respectively. At every 10 seconds the temperature and one RF-line is stored in a PC for future processing.
The possibility to estimate temperature was assessed by considering two RF-line features: temporal echo-shifts produced by changes in speed-of-sound and medium expansion/contraction and by changes on the backscattered energy originated by medium inhomogeneities.
On one hand, results prove that echo-shifts correlated with temperature in both types of medium (phantom and ex-vivo porcine muscle). On the other hand, analyzing the backscattered energies one may conclude that this measures correlates with temperature in the porcine sample and not on the phantom. This led us to conclude that the developed phantom is not appropriate for studying changes on backscattered energy with temperature. Energy analysis of the porcine sample confirms the non-uniform temperature variation due to the existence of a heterogeneous media with different sound propagation velocities.
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References
Arthur, R.M., Straube, W.L., Trobaugh, J.W., Moros, E.G.: Noninvasive temperature estimation of hyperthermia temperatures with ultrasound. Int. J. Hyperthermia 21, 589–600 (2005)
Paulsen, K.D., Moskowitz, M.J., Ryan, T.P., Mitchell, S.E., Hoopes, P.J.: Initial in vivo experience with eit as a thermal estimator during hyperthermia. Int. J. Hyperthermia 12, 573–591 (1996)
Meaney, P.M., Paulsen, K.D.: Microwave imaging for tissue assessment: initial evaluation in multitarget tissue equivalent phantoms. IEEE Trans. Biomed. Eng. 43, 878–890 (1996)
Hynynen, K., Chung, A., Fjield, T., Buchanan, M., Daum, D., Colucci, V., Lopath, P., Jolesz, F.: Feasibility of using ultrasound phased arrays for mri monitored noninvasive surgery. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 43, 1043–1052 (1996)
Simon, C., VanBaren, P., Ebbini, E.S.: Two-dimensional temperature estimation using diagnostic ultrasound. IEEE Trans. Ultrason. Ferroelectr. Freq. Control 45, 1088–1099 (1998)
Damianou, C.A., Sanghvi, N.T., Fry, F.J., MaassMoreno, R.: Dependence of ultra-sonic attenuation and absorption in dog soft tissues on temperature and thermal dose. Journal of the Acoustical Society of America 102, 628–634 (1997)
Teixeira, C.A., Graça Ruano, M., Ruano, A.E., Pereira, W.C.A.: Non-invasive tissue temperature evaluation during application of therapeutic ultrasound: precise time-spatial non-linear modelling. In: Kim, S.I., Suh Seoul, T.S. (eds.) IFMBE Proceedings –WC 2006 World Congress on Medical Physics and Biomedical Engineering, Seoul, Korea, August 27- September 1, pp. 70–73 (2006)
Teixeira, C.A., Pereira, W.C.A., Ruano, A.E., Graça Ruano, M.: NARX structures for non-invasive temperature estimation in non-homogeneous media. In: Proceedings of the IEEE International Symposium on Intelligent Signal Processing, Alcalá de Henares, Spain, October 3-5, pp. 169–174 (2007)
Teixeira, C.A., Graça Ruano, M., Ruano, A.E., Pereira, W.C.A.: A soft-computing methodology for non-invasive time-spatial temperature estimation. IEEE Transactions on Biomedical Engineering 55(2), 572–580 (2008)
Teixeira, C.A., Pereira, W.C.A., Ruano, A.E., Graça Ruano, M.: On non-invasive multilayer temperature estimation using soft-computing methods. Ultrasonics 50(1), 32–43 (2010)
Alvarenga, A.V., Teixeira, C.A., Graça Ruano, M., Pereira, W.C.A.: Influence of temperature variations on the entropy and correlation of the gray-level co-occurence matrix from B-Mode images. Ultrasonics 50, 2 (2010)
Viola, F., Walker, W.F.: A spline-based algorithm for continuous time-delay estimation using sampled data. IEEE Trans. Ultrasonics, Ferroelectrics, Frequency Control 52(1), 80–89 (2005)
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Ruano, M.G., Teixeira, C.A., Rahmati, J.J. (2013). Characterization of Temperature-Dependent Echo-Shifts and Backscattered Energy Induced by Thermal Ultrasound. In: Balas, V., Fodor, J., Várkonyi-Kóczy, A., Dombi, J., Jain, L. (eds) Soft Computing Applications. Advances in Intelligent Systems and Computing, vol 195. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-33941-7_39
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DOI: https://doi.org/10.1007/978-3-642-33941-7_39
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