Real-time estimation of the temperature field for invasive laser-induced thermal therapy employing a Kalman filter

IF 2.9 2区 生物学 Q2 BIOLOGY
Zhenbiao Li , Hong Chen , Yalan Ji , Guangjun Wang
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Abstract

Laser-induced thermal therapy (LITT) represents a developing, minimally invasive approach used in the practice of oncology, has received attention in the field of therapeutic techniques for malignant tumors. Research and the development of LITT technology rely on the online calculation of a biological tissue's transient thermal field. This paper investigates the online estimation of the temperature field of biological tissues for the invasive LITT process is investigated based on Kalman filter theory. Firstly, thermal conduction model for tissue sample for the invasive LITT process is established based on Penne's biological heat transfer equation and the Beer-Lambert law, and the associated state space model is built on this basis. Subsequently, time-dependent temperature distribution within the tissue of interest is estimated in real-time by integrating the temperature measurement data from a singular measurement point within the treatment site and a state-space representation of thermal transport within tissue sample and KF algorithm. In this paper, the reliability of the constructed state-space representation of thermal transfer within tissue sample is verified with the help of published experimental data on laser irradiation of tissue sample, and the influence of laser radiation form, model mismatch, and the issue of measurement noise when estimating temporary temperature distributions in tissues is discussed through numerical experimentation. The test results indicate that the transient maximal temperature deviation of the estimated temperature field is 0.751 K and 0.731 K under different forms of laser irradiation, respectively, indicating that the scheme in this paper is universal and can effectively estimate the temperature distribution within biological issue under varied optical irradiation forms. When the standard deviation δr of the measurement noise is 0.7 K, the instantaneous error of maximum magnitude pertaining to the estimation of the temperature field is about 0.75 K. The root means square error (RMSE) and MRE of the temperature estimation results are always lower than 0.30 K and 0.5 %. This scheme can provide a more accurate reckon of the inherent thermal distribution in tissue of interest better when model mismatch occurs in the offline link.
利用卡尔曼滤波实时估计侵入性激光诱导热治疗的温度场。
激光诱导热疗法(LITT)是一种新兴的、微创的肿瘤治疗方法,在恶性肿瘤治疗技术领域受到广泛关注。LITT技术的研究和发展依赖于生物组织瞬态热场的在线计算。研究了基于卡尔曼滤波理论的生物组织温度场在线估计方法。首先,基于Penne的生物传热方程和Beer-Lambert定律,建立了侵入性LITT过程中组织样本的热传导模型,并在此基础上建立了相关的状态空间模型。随后,通过整合处理场地内单个测量点的温度测量数据和组织样本内热传输的状态空间表示以及KF算法,实时估计感兴趣组织内随时间变化的温度分布。本文利用已发表的激光照射组织样品的实验数据,验证了所构建的组织样品内热传递状态空间表示的可靠性,并通过数值实验讨论了激光照射形式、模型失配和测量噪声对估计组织内临时温度分布的影响。实验结果表明,在不同激光照射形式下,估计温度场的瞬态最大温度偏差分别为0.751 K和0.731 K,表明本文方案具有通用性,可以有效估计不同光照射形式下生物体内的温度分布。当测量噪声的标准差δr为0.7 K时,温度场估计的最大瞬时误差约为0.75 K。温度估计结果的均方根误差(RMSE)和MRE均小于0.30 K和0.5%。当离线链路中出现模型失配时,该方案可以更好地提供对感兴趣组织内固有热分布的更准确估计。
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来源期刊
Journal of thermal biology
Journal of thermal biology 生物-动物学
CiteScore
5.30
自引率
7.40%
发文量
196
审稿时长
14.5 weeks
期刊介绍: The Journal of Thermal Biology publishes articles that advance our knowledge on the ways and mechanisms through which temperature affects man and animals. This includes studies of their responses to these effects and on the ecological consequences. Directly relevant to this theme are: • The mechanisms of thermal limitation, heat and cold injury, and the resistance of organisms to extremes of temperature • The mechanisms involved in acclimation, acclimatization and evolutionary adaptation to temperature • Mechanisms underlying the patterns of hibernation, torpor, dormancy, aestivation and diapause • Effects of temperature on reproduction and development, growth, ageing and life-span • Studies on modelling heat transfer between organisms and their environment • The contributions of temperature to effects of climate change on animal species and man • Studies of conservation biology and physiology related to temperature • Behavioural and physiological regulation of body temperature including its pathophysiology and fever • Medical applications of hypo- and hyperthermia Article types: • Original articles • Review articles
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