Acquisition of 3<scp>D</scp> temperature distributions in fluid flow using proton resonance frequency thermometry

Buchenberg, Waltraud B.; Wassermann, Florian; Grundmann, Sven; Jung, Bernd; Simpson, Robin

doi:10.1002/mrm.25874

Cited by 11 publications

(8 citation statements)

References 46 publications

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“…Despite the powerful advantages of MRT, this technique is sparcely developed in the engineering sciences. To our knowledge, few studies, which measure temperature by MRI in the field of fluid mechanics and thermal sciences, have been published [6,7,8]. The first study [6] presents qualitative results concerning the flow and heat transfer in a fluid layer of ethylene glycol submitted to a vertical temperature gradient for large values of temperature difference between the horizontal slabs (around 60…”

Section: Introductionmentioning

confidence: 99%

“…The studies [7,8] investigate the flow of water with addition of a contrast agent. The latter is used to increase the accuracy of the measurements by increasing the signal to noise ratio and decreasing the experiments duration, in respectively a heat exchanger [7] and a fully turbulent jet mixing [8]. Validation of the studies [7,8] is provided in [7] and [9].…”

Section: Introductionmentioning

confidence: 99%

“…The latter is used to increase the accuracy of the measurements by increasing the signal to noise ratio and decreasing the experiments duration, in respectively a heat exchanger [7] and a fully turbulent jet mixing [8]. Validation of the studies [7,8] is provided in [7] and [9]. The MRI Thermometry difficulties are associated to the indirect measurement technique which depends essentially on the fluid properties.…”

Section: Introductionmentioning

confidence: 99%

“…This technique is the most common method used in the medical field. It has also been used in the temperature acquisition in the case of turbulent fluid flows including heat transfer [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Depending of the chosen method, the temperature measurement is either absolute or relative. In the case where the measurement is relative, it involves a comparison with a reference obtained in similar experimental conditions and at relatively close times [7,8].…”

Section: Introductionmentioning

confidence: 99%

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MRI temperature and velocity measurements in a fluid layer with heat transfer

Leclerc

Métivier

2018

Exp Fluids

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To cite this version:Sébastien Leclerc, C. Métivier. MRI temperature and velocity measurements in a fluid layer with heat transfer. Experiments in Fluids, Springer Verlag (Germany), 2018, 59 (2), 10.1007/s00348-018-2494-3. hal-01693075Noname manuscript No. Résumé Magnetic Resonance Thermometry (MRT) is an innovative technique which can provide 2D and 3D temperature measurements using Magnetic Resonance Imaging (MRI). Despite the powerful advantages of MRT, this technique is sparcely developed and used in the engineering sciences. In this paper, we investigate the possibility to measure temperatures with MRI in a fluid layer submitted to heat transfer. By imposing a vertical temperature gradient, we study the temperature fields in both conductive and convective regimes. The temperature fields are obtained by measuring the transverse relaxation time T 2 in glycerol, a Newtonian fluid. The MRT protocol is described in detail and the results are presented. We show that for a conductive regime, temperature measurements are in very good agreement with the theoretical profile. In the convective regime, when comparing the temperature and velocity fields obtained by MRI, we get an excellent agreement in terms of flow structure. Temperature uncertainties are found to be less than 1• C for all our results.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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MRI temperature and velocity measurements in a fluid layer with heat transfer

Leclerc

Métivier

2018

Exp Fluids

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A strategy to prevent a temperature‐induced MRI artifact in warm liquid phantoms due to convection currents

2021

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MRI phantom studies often fail to mimic the temperature of the human body, which can negatively impact accuracy. An artifact induced by increasing temperature in liquid phantoms was observed, presenting a significant challenge to temperature‐controlled experiments. In this study we characterize and provide a solution to eliminate this temperature‐induced MRI artifact. Low concentration (0.5–2.5 mM) agar phantoms were prepared. Utilizing a temperature‐controlled phantom holder, T1‐ and T2‐weighted structural images were acquired at 7 T along with quantitative B0, B1, T1, T2 and ADC maps at both 25 and 37°C. Additionally, computer simulations were conducted to demonstrate the fluid flow and thermal flux patterns in water to provide an insight into the origins of the artifact. Evidence from computer simulation and quantitative MRI strongly suggest the artifact was caused by heat transfer in the form of natural convection leading to structured patterns of signal loss in MR images. The artifact was present up to agar concentrations of 1.5 mM (T1 = 3068 ± 16 ms, T2 = 1052 ± 20 ms, ADC = 2.29 ± 0.36 × 10−3 mm2/s at 25°C; T1 = 3928 ± 44 ms, T2 = 1122 ± 24 ms, ADC = 2.64 ± 0.49 × 10−3 mm2/s at 37°C), above which point increased sample viscosity no longer allows for convection currents, thereby eliminating the artifact. The methodology described in this work simplifies quantitative MR acquisition of liquid phantoms at physiological temperature by suppressing convection currents with relatively small changes to intrinsic MR parameters (T1 increased by 1.4% and T2 decreased by 17% for 1.5 mM agar at 25°C).

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