Comput Math Methods Med - An approach for the visualization of temperature distribution in tissues according to changes in ultrasonic backscattered energy.

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Resumo

Previous studies developed ultrasound temperature-imaging methods based on changes in backscattered energy (CBE) to monitor variations in temperature during hyperthermia. In conventional CBE imaging, tracking and compensation of the echo shift due to temperature increase need to be done. Moreover, the CBE image does not enable visualization of the temperature distribution in tissues during nonuniform heating, which limits its clinical application in guidance of tissue ablation treatment. In this study, we investigated a CBE imaging method based on the sliding window technique and the polynomial approximation of the integrated CBE (ICBEpa image) to overcome the difficulties of conventional CBE imaging. We conducted experiments with tissue samples of pork tenderloin ablated by microwave irradiation to validate the feasibility of the proposed method. During ablation, the raw backscattered signals were acquired using an ultrasound scanner for B-mode and ICBEpa imaging. The experimental results showed that the proposed ICBEpa image can visualize the temperature distribution in a tissue with a very good contrast. Moreover, tracking and compensation of the echo shift were not necessary when using the ICBEpa image to visualize the temperature profile. The experimental findings suggested that the ICBEpa image, a new CBE imaging method, has a great potential in CBE-based imaging of hyperthermia and other thermal therapies.

Resumo Limpo

previous studi develop ultrasound temperatureimag method base chang backscatt energi cbe monitor variat temperatur hyperthermia convent cbe imag track compens echo shift due temperatur increas need done moreov cbe imag enabl visual temperatur distribut tissu nonuniform heat limit clinic applic guidanc tissu ablat treatment studi investig cbe imag method base slide window techniqu polynomi approxim integr cbe icbepa imag overcom difficulti convent cbe imag conduct experi tissu sampl pork tenderloin ablat microwav irradi valid feasibl propos method ablat raw backscatt signal acquir use ultrasound scanner bmode icbepa imag experiment result show propos icbepa imag can visual temperatur distribut tissu good contrast moreov track compens echo shift necessari use icbepa imag visual temperatur profil experiment find suggest icbepa imag new cbe imag method great potenti cbebas imag hyperthermia thermal therapi

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