Multidimensional strain and temperature measurements using a novel high-birefringent fiber Bragg grating interrogation system

2004 ◽  
Author(s):  
Edmon Chehura ◽  
Alexandros A. Skordos ◽  
Chen-Chun Ye ◽  
Stephen W. James ◽  
Ivana K. Partridge ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Temperature Measurements ◽  
Bragg Grating ◽  
Birefringent Fiber

scholarly journals Fiber Bragg Grating Sensors for Millimetric-Scale Temperature Monitoring of Cardiac Tissue Undergoing Radiofrequency Ablation: A Feasibility Assessment

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6490
Author(s):  
Martina Zaltieri ◽  
Greta Allegretti ◽  
Carlo Massaroni ◽  
Emiliano Schena ◽  
Filippo Maria Cauti
Keyword(s):  
Radiofrequency Ablation ◽  
Temperature Distribution ◽  
Fiber Bragg Grating ◽  
Treatment Time ◽  
Ex Vivo ◽  
Single Point ◽  
Temperature Measurements ◽  
Bragg Grating ◽  
Fiber Bragg Grating Sensors ◽  
Scale Temperature

Radiofrequency ablation (RFA) is the most widely used technique for the treatment of cardiac arrhythmias. A variety of factors, such as the electrode tip shape, the force exerted on the tissue by the catheter and the delivered power, combine to determine the temperature distribution, and as consequence, the lesion shape and size. In this context, being able to know the temperature reached in the myocardium during the RFA can be helpful for predicting the lesion dimensions to prevent the occurrence of undesired tissue damage. The catheters used so far in such procedures provide single-point temperature measurements within the probe (by means of embedded thermocouples or thermistors), so no information regarding the temperature changes occurring in myocardial tissues can be retrieved. The aim of this study was to assess the feasibility of fiber Bragg grating sensors (FBGs) to perform multi-point and millimetric-scale temperature measurements within myocardium subjected to RFA. The assessment has been performed on ex vivo porcine myocardium specimens undergoing RFA. Data show the feasibility of the proposed solution in providing spatial temperature distribution within the myocardial tissue during the entire RFA. These high-resolved measurements may allow reconstructing the temperature distribution in the tissue. This study lays the foundations for the implementation of 3D thermal maps to investigate how the supplied power, treatment time, force of contact and irrigation flow of the catheter influence the thermal effects within the tissue.

Dispersion effects in a highly birefringent fiber laser sensor with fiber Bragg grating reflectors

2002 ◽  
Vol 27 (11) ◽  
pp. 897 ◽  
Author(s):  
Karim Haroud ◽  
Klaus Bohnert ◽  
Andreas Frank ◽  
Hubert Brändle
Keyword(s):  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Laser Sensor ◽  
Dispersion Effects ◽  
Birefringent Fiber
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