Non‐invasive thermometry for monitoring hepatic radiofrequency ablation

Frich, Lars

doi:10.1080/13645700500470025

Cited by 35 publications

(19 citation statements)

References 52 publications

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“…An overview of possible methods for temperature monitoring for hepatic radiofrequency (RF) ablation brings article [3]. Frich defined ideal requirements for noninvasive thermometry during the ablation (temperature accuracy: < 1-2 • C, spatial resolution: < 1-2 mm while low cost of the technology being a bonus).…”

Section: ) Microwave Differential Tomographymentioning

confidence: 99%

Microwave Non-Invasive Temperature Monitoring Using Uwb Radar for Cancer Treatment by Hyperthermia

Fišer¹,

Helbig²,

Sachs³

et al. 2018

PIER

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Abstract-Objective:In this paper we present a study of a novel method to noninvasively monitor temperature during thermotherapy for instance in cancer treatment using M-sequence radar technology. The main objective is to investigate the temperature dependence of reflectivity in UWB radar signal in gelatine phantoms using electrically small antennas. Methods: The phantom was locally heated up, and consequently changes of signal reflectivity were observed. Results: An approximate linear relationship between temperature change and reflectivity variations was formulated. To show the potential of this approach we used an M-sequence MIMO radar system. The system was tested on breast-shape phantom with local heating by circulating water of controlled temperature. Delay and Sum algorithm was implemented for two-dimensional imaging. Significance: The article is a study of temperature measurement using UWB radar system for possible usage in thermotherapy.

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Section: ) Microwave Differential Tomographymentioning

confidence: 99%

Microwave Non-Invasive Temperature Monitoring Using Uwb Radar for Cancer Treatment by Hyperthermia

Fišer¹,

Helbig²,

Sachs³

et al. 2018

PIER

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“…A real-time feedback of temperature distribution within the organ may be useful to estimate the amount of damaged tissue, hence to lead the physician in the adjustment of laser settings, to optimize the clinical outcomes [6]. Thermometry in thermal treatments has to fulfil strict criteria: spatial resolution better than 5 mm, acquisition time of some seconds, and temperature accuracy of ~1-2 °C [7,8].…”

Section: Introductionmentioning

confidence: 99%

Error of a Temperature Probe for Cancer Ablation Monitoring Caused by Respiratory Movements: <italic>Ex Vivo</italic> and <italic>In Vivo</italic> Analysis

et al. 2016

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Hyperthermal techniques are spreading as an alternative to conventional surgery for cancer removal. A real-time temperature feedback can be used to adjust the treatment settings, in order to improve the clinical outcomes. In this paper, we experimentally assessed the feasibility for distributed temperature monitoring of a custom probe, which consists of a needle embedding six fiber Bragg gratings (FBGs). Since FBGs are also sensitive to strain, we focused on the analysis of the measurement error (artifact) caused by respiratory movements. We assessed the artifact both on ex vivo pig liver and lung (by mimicking the movement of these organs caused by respiration) and on in vivo trial on pig liver. Lastly, we proposed an algorithm to detect and minimize the artifact during ex vivo liver laser ablation. During both ex vivo and in vivo trials, the probe insertion within the organ was easy and safe. The artifact was significant (up to 3 °C), but the correction algorithm allows minimizing the error. The main advantages of the proposed probe are: 1) spatially resolved temperature monitoring (in six points of the tissue by inserting a single needle) and 2) the needle is magnetic resonance (MR)-compatible, hence can be used during MR-guided procedure. Even if the model is close to humans, further trials are required to investigate the feasibility of the probe for clinical applications.

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“…As the nuclei re-align, they emit energy that can be detected by a receiver coil. 188 Figure 3 shows the main components of a MRI system. The mechanical integration of any applicator for thermotherapy with magnetic resonance (MR)-tomographs is generally easy to realize.…”

Section: Operationmentioning

confidence: 99%

“…Some techniques are currently in clinical use, while others are still in the preclinical or experimental stage. 188 Thermal imaging is classifi ed into two main types: active and passive. Active methods for thermal imaging expose the region of interest to energy.…”

Section: Noninvasive Techniquesmentioning

confidence: 99%

Thermal Therapy, Part IV: Electromagnetic and Thermal Dosimetry

Habash

Bansal

Krewski

et al. 2007

Crit Rev Biomed Eng

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ABSTRACT:In this article some of the important techniques in electromagnetic (EM) and thermal dosimetry are reviewed. Three major areas are discussed: modeling power deposition and estimation of EM energy absorbed by tissues exposed to EM radiation, electrical-thermal modeling for thermal therapy with various models of heat transfer in living tissues, and thermal dosimetry using invasive and noninvasive thermometry. Knowledge about the temperature distributions achieved can only be obtained by treatment planning of patient therapy. This process is called thermal therapy planning system (TTPS), which is a large and complex system for design, control, documentation, and evaluation of the treatment that also provides data for treatment optimization. Various imaging techniques for guidance and monitoring necessary for clinical treatments are also discussed. The review concludes by suggesting future avenues for investigations.

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Non‐invasive thermometry for monitoring hepatic radiofrequency ablation

Abstract: This paper reviews a selection of methods for non-invasive thermometry with special attention to limitations of possible relevance for hepatic radiofrequency ablation.

Cited by 35 publications

References 52 publications

Microwave Non-Invasive Temperature Monitoring Using Uwb Radar for Cancer Treatment by Hyperthermia

Microwave Non-Invasive Temperature Monitoring Using Uwb Radar for Cancer Treatment by Hyperthermia

Error of a Temperature Probe for Cancer Ablation Monitoring Caused by Respiratory Movements: <italic>Ex Vivo</italic> and <italic>In Vivo</italic> Analysis

Thermal Therapy, Part IV: Electromagnetic and Thermal Dosimetry

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