Evaluation of nonscanned mode soft-tissue thermal index in the presence of the residual temperature rise

Karagöz, İrfan; Kartal, M. Kemal

doi:10.1016/j.ultrasmedbio.2006.02.1404

Cited by 4 publications

(6 citation statements)

References 20 publications

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“…It can be expected that similar results can be obtained for all other cases discussed in Karagoz and Kartal (2006). I conclude that for the case of a single stationary transducer there is no need to consider the effect of residual temperature rise.…”

Section: To the Editor-in-chiefsupporting

confidence: 72%

“…Recently, Karagoz and Kartal (2006) considered the temperature rise ⌬T in tissue at the focus of a stationary transducer, which is on for some time, after which an off-period follows, which finally is followed by a second on-period. The temperature rise caused by the first heating period remaining at (the beginning of) the second heating period is called the residual temperature rise (see their Fig.…”

Section: To the Editor-in-chiefmentioning

confidence: 99%

“…In our previous papers (Karagoz and Kartal 2005;2006), we calculated the residual temperature rise (RTR) at the focus of a transducer by assuming that the uniform temperature field occurs at the end of the first ultrasound examination to obtain worst-case temperature rise. After all, Lubbers (2006) theoretically proposed that there is no need to consider the effect of residual temperature rise for the case of a single stationary transducer.…”

Section: Response To Dr Lubber's Lettermentioning

confidence: 99%

“…In our previous papers, we calculated an RTR at focus (Karagoz and Kartal 2005;2006). In this study, we also obtained the temperature rise at other locations in the presence of the RTR.…”

Section: Response To Dr Lubber's Lettermentioning

confidence: 99%

See 3 more Smart Citations

The Effects of Residual Temperature Rise on Ultrasound Heating

Lubbers

2007

Ultrasound in Medicine & Biology

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Section: To the Editor-in-chiefsupporting

confidence: 72%

Section: To the Editor-in-chiefmentioning

confidence: 99%

Section: Response To Dr Lubber's Lettermentioning

confidence: 99%

“…In our previous papers, we calculated an RTR at focus (Karagoz and Kartal 2005;2006). In this study, we also obtained the temperature rise at other locations in the presence of the RTR.…”

Section: Response To Dr Lubber's Lettermentioning

confidence: 99%

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The Effects of Residual Temperature Rise on Ultrasound Heating

Lubbers

2007

Ultrasound in Medicine & Biology

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“…The minimum and maximum TIs are 0.4 and 4.1 at 100 V pp and 300 V pp , respectively. It is demonstrated that TIs obtained under given conditions here satisfy the FDA regulation regarding ultrasonic exposure over the range of tens of kHz [22,23]. All measured power and TI data are listed in Table 1.…”

Section: Resultsmentioning

confidence: 62%

Acoustic Power Measurement and Thermal Bioeffect Evaluation of Therapeutic Langevin Transducers

Kim

Lee

2022

Sensors

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We recently proposed an analytical design method of Langevin transducers for therapeutic ultrasound treatment by conducting parametric study to estimate the effect of compression force on resonance characteristics. In this study, experimental investigations were further performed under various electrical conditions to observe the acoustic power of the fully equipped transducer and to assess its heat-related bioeffect. Thermal index (TI) tests were carried out to examine temperature rise and thermal damage induced by the acoustic energy in fatty porcine tissue. Acoustic power emission, TI values, temperature characteristics, and depth/size of thermal ablation were measured as a function of transducer’s driving voltage. By exciting the transducer with 300 Vpp sinusoidal continuous waveform, for instance, the average power was 23.1 W and its corresponding TI was 4.1, less than the 6 specified by the Food and Drug Administration (FDA) guideline. The maximum temperature and the depth of the affected site were 74.5 °C and 19 mm, respectively. It is shown that thermal ablation is likely to be more affected by steep heat surge for a short duration rather than by slow temperature rise over time. Hence, the results demonstrate the capability of our ultrasonic transducer intended for therapeutic procedures by safely interrogating soft tissue and yet delivering enough energy to thermally stimulate the tissue in depth.

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Evaluation of biological effects induced by diagnostic ultrasound in the rat foetal tissues

et al. 2006

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In recent years, there has been growing interest in estimating the degree of heating caused by the diagnostic ultrasound in clinical practice. Both theoretical and experimental methods have been suggested for estimating the heating potential, or thermal hazard, of diagnostic ultrasound. Aim of this study was to evaluate in vivo effects of ultrasound exposure of variable duration (from 10 up to 20 min) with commercially available imaging systems commonly used for diagnostic imaging. Numerical results related to the thermal effect are obtained by simulation program based on B-mode (scanning) and Doppler (non-scanning). To investigate the biological effects of the ultrasound exposure to the brain and liver tissues, the antioxidant enzyme activity and thiobarbituric acid reactive substances (TBARS) of the tissues were evaluated. In liver tissue, as a lipid peroxidation index, TBARS levels very significantly increase in Doppler group compared to control. However, in B-mode, TBARS levels are the same with the control group. Use of B-mode in foetal tissue is more reliable than Doppler mode because temperature rise is very small compared to the Doppler mode. On the other hand, the antioxidant enzyme activities tend to increase in B-mode and Doppler groups compared to the control group as a defensive mechanism. In the brain tissue, lipid peroxidation is increased slightly in B-mode compared to the control group. This situation is related to the molecular structure of the brain tissue because of its high lipid concentration. In brain tissue, the antioxidant enzyme activities and lipid peroxidation were significantly increased, such as liver tissue in Doppler groups. Doppler ultrasound may produce harmful effects in rat foetus liver and brain tissues as a result of the high temperature rises.

show abstract

Evaluation of nonscanned mode soft-tissue thermal index in the presence of the residual temperature rise

Cited by 4 publications

References 20 publications

The Effects of Residual Temperature Rise on Ultrasound Heating

The Effects of Residual Temperature Rise on Ultrasound Heating

Acoustic Power Measurement and Thermal Bioeffect Evaluation of Therapeutic Langevin Transducers

Evaluation of biological effects induced by diagnostic ultrasound in the rat foetal tissues

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