1. Fiber Bragg Grating Sensors for Performance Evaluation of Fast Magnetic Resonance Thermometry on Synthetic Phantom
- Author
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Alexey A. Wolf, Martina De Landro, Maxime Yon, Emiliano Schena, Jacopo Ianniello, Bruno Quesson, Paola Saccomandi, Centre de recherche Cardio-Thoracique de Bordeaux [Bordeaux] (CRCTB), and Université Bordeaux Segalen - Bordeaux 2-CHU Bordeaux [Bordeaux]-Institut National de la Santé et de la Recherche Médicale (INSERM)
- Subjects
gradient-echo echo-planar imaging ,Temperature monitoring ,magnetic resonance thermometry imaging ,Materials science ,Magnetic Resonance Spectroscopy ,accuracy evaluation ,Mean squared error ,[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging ,thermometry ,lcsh:Chemical technology ,01 natural sciences ,Biochemistry ,Imaging phantom ,Article ,030218 nuclear medicine & medical imaging ,Analytical Chemistry ,03 medical and health sciences ,0302 clinical medicine ,Optics ,Fiber Bragg grating ,Thermal ,lcsh:TP1-1185 ,Electrical and Electronic Engineering ,Instrumentation ,fiber bragg grating sensors ,Laser ablation ,business.industry ,Echo-Planar Imaging ,Phantoms, Imaging ,010401 analytical chemistry ,Limits of agreement ,Hyperthermia, Induced ,Magnetic Resonance Imaging ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Magnetic resonance thermometry ,laser ablation ,business - Abstract
The increasing recognition of minimally invasive thermal treatment of tumors motivate the development of accurate thermometry approaches for guaranteeing the therapeutic efficacy and safety. Magnetic Resonance Thermometry Imaging (MRTI) is nowadays considered the gold-standard in thermometry for tumor thermal therapy, and assessment of its performances is required for clinical applications. This study evaluates the accuracy of fast MRTI on a synthetic phantom, using dense ultra-short Fiber Bragg Grating (FBG) array, as a reference. Fast MRTI is achieved with a multi-slice gradient-echo echo-planar imaging (GRE-EPI) sequence, allowing monitoring the temperature increase induced with a 980 nm laser source. The temperature distributions measured with 1 mm-spatial resolution with both FBGs and MRTI were compared. The root mean squared error (RMSE) value obtained by comparing temperature profiles showed a maximum error of 1.2 °, C. The Bland-Altman analysis revealed a mean of difference of 0.1 °, C and limits of agreement 1.5/&minus, 1.3 °, C. FBG sensors allowed to extensively assess the performances of the GRE-EPI sequence, in addition to the information on the MRTI precision estimated by considering the signal-to-noise ratio of the images (0.4 °, C). Overall, the results obtained for the GRE-EPI fully satisfy the accuracy (~2 °, C) required for proper temperature monitoring during thermal therapies.
- Published
- 2020
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