Fiber Bragg Grating Sensors for Performance Evaluation of Fast Magnetic Resonance Thermometry on Synthetic Phantom

Landro, Martina De; Ianniello, Jacopo; Yon, Maxime; Wolf, Alexey A.; Quesson, Bruno; Schena, Emiliano; Saccomandi, Paola

doi:10.3390/s20226468

Cited by 15 publications

(10 citation statements)

References 49 publications

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“…In some cases, thermal treatment monitoring is based on temperature measurement. Magnetic resonance (MR) thermometry is the main image-based technique recognized in clinical practice [ 6 ]. Despite the non-invasiveness and its potential in providing two or three-dimensional information of the tissue temperature, it is costly and holds important limitations related to the motion artifacts and the necessity of working with MR-compatible devices [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Imagery for Assessing Laser-Induced Thermal State Change in Liver

Landro

García-Molina

Barberio

et al. 2021

Sensors

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This work presents the potential of hyperspectral imaging (HSI) to monitor the thermal outcome of laser ablation therapy used for minimally invasive tumor removal. Our main goal is the establishment of indicators of the thermal damage of living tissues, which can be used to assess the effect of the procedure. These indicators rely on the spectral variation of temperature-dependent tissue chromophores, i.e., oxyhemoglobin, deoxyhemoglobin, methemoglobin, and water. Laser treatment was performed at specific temperature thresholds (from 60 to 110 °C) on in-vivo animal liver and was assessed with a hyperspectral camera (500–995 nm) during and after the treatment. The indicators were extracted from the hyperspectral images after the following processing steps: the breathing motion compensation and the spectral and spatial filtering, the selection of spectral bands corresponding to specific tissue chromophores, and the analysis of the areas under the curves for each spectral band. Results show that properly combining spectral information related to deoxyhemoglobin, methemoglobin, lipids, and water allows for the segmenting of different zones of the laser-induced thermal damage. This preliminary investigation provides indicators for describing the thermal state of the liver, which can be employed in the future as clinical endpoints of the procedure outcome.

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Section: Introductionmentioning

confidence: 99%

Hyperspectral Imagery for Assessing Laser-Induced Thermal State Change in Liver

Landro

García-Molina

Barberio

et al. 2021

Sensors

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“…The proposed approach sets the basis for the implementation of a patient-specific model for procedure dosimetry and temperature estimation based on the temperature information from FBGs. When compared to thermometry based on diagnostic imaging [29], [30], sensors provide limited information about the temperature profile, but they are more interesting from a clinical point of view for their usability and cost-effectiveness. To reconstruct the temperature map from FBGs-based measurement, we propose to use an Unscented Kalman Filter combined with a heat transfer model.…”

Section: Liver Data Resultsmentioning

confidence: 99%

Model-Based Thermometry for Laser Ablation Procedure Using Kalman Filters and Sparse Temperature Measurements

Schulmann

Soltani-Sarvestani

Landro

et al. 2022

IEEE Trans. Biomed. Eng.

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We implement a data-assimilation Bayesian framework for the reconstruction of the spatiotemporal profile of the tissue temperature during laser irradiation. The predictions of a physical model simulating the heat transfer in the tissue are associated with sparse temperature measurements, using an Unscented Kalman Filter. Methods: We compare a standard state-estimation filtering procedure with a joint-estimation (state and parameters) approach: whereas in the state-estimation only the temperature is evaluated, in the joint-estimation the filter corrects also uncertain model parameters (i.e., the medium thermal diffusivity, and laser beam properties). We have tested the method on synthetic temperature data, and on the temperature measured on agar-gel phantom and porcine liver with fiber optic sensors. Results: The joint-estimation allows retrieving an accurate estimate of the temperature distribution with a maximal error < 1.5 °C in both synthetic and liver 1D data, and < 2 °C in phantom 2D data. Our approach allows also suggesting a strategy for optimizing the temperature estimation based on the positions of the sensors. Under the constraint of using only two sensors, optimal temperature estimation is obtained when one sensor is placed in proximity of the source, and the other one is non-symmetrical. Conclusion: The joint-estimation significantly improves the predictive capability of the physical model. Significance: This work opens new perspectives on the benefit of data-assimilation frameworks for laser therapy monitoring.

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“…SHM systems use a number of advanced sensors, such as fiber Bragg grating (FBG) sensors [ 21 , 22 , 23 , 24 ]. There are also works connected with the application of laser vibrometers in SHM application [ 8 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], but authors have not found any information about the use of such sensors onboard ships.…”

Section: Introductionmentioning

confidence: 99%

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Szeleziński

Muc

Murawski

et al. 2021

Sensors

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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Fiber Bragg Grating Sensors for Performance Evaluation of Fast Magnetic Resonance Thermometry on Synthetic Phantom

Cited by 15 publications

References 49 publications

Hyperspectral Imagery for Assessing Laser-Induced Thermal State Change in Liver

Hyperspectral Imagery for Assessing Laser-Induced Thermal State Change in Liver

Model-Based Thermometry for Laser Ablation Procedure Using Kalman Filters and Sparse Temperature Measurements

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

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