Validation of a Real-Time Ultrasound Parametric Imaging System for Monitoring Radio-Frequency Ablation
Date Issued
2014
Date
2014
Author(s)
Chuang, Shih-Peng
Abstract
With medical improvements , continue to improve methods of treating liver cancer, radiofrequency ablation(RFA) is an emerging therapy in recent years as , also widely used in the clinical treatment. In order to monitor RFA, requiring an auxiliary, guiding tool to evaluate ablation zone, ultrasound imaging is the most commonly used clinical evaluating tools, with a non-invasive, real-time, non-ionizing radiation, easy to carry, and inexpensive . Conventionally, ultrasound imaging is displayed as B-mode imaging, but B-mode imaging can’t identify thermal zone clearly.
In this study, we investigate the use of ultrasound Nakagami developed in our laboratory imaging as a new tool for monitoring RFA therapy. Ultrasound Nakagami imaging has been shown to be capable of differentiating the characteristics of local tissues through the distribution, arrangement, and concentration differences in local scattering, combined to enhance the sensitivity of the frequency diversity and compounding technology, with later polynomial approximation imaging . We develop the real-time ultrasound monitoring system. Using in vitro to verify the effectiveness and feasibility on the RFA monitoring system.
Using in vitro (liver tissue) to evaluate tissue ablation zone, we can verify imaging ablation area and true ablation area of liver tissue sections in the polynomial approximation imaging of -6 dB of the correlation coefficients is highest. Therefore we regulate -6 dB as the standard of imagnig area.
In the experiments ,we try to use different electrode lengths for verifying ablation area. The results show that the use of real-time parametric imaging system monitoring radiofrequency ablation, using small electrode length (0.5, 1.0 cm) to detect ablation area of tissue assessment will be compared accurately.
Subjects
射頻燒灼治療,超音波
Nakagami影像
頻率分集與複合技術
SDGs
Type
thesis
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