Body Temperature Mapping by Magnetic Resonance Imaging

Lewa, C. J.; Certaines, Jacques D. de

doi:10.1080/00387019408003244

Cited by 16 publications

(13 citation statements)

References 57 publications

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“…Mapping the spatial distribution of temperature by MRI has already been developed for monitoring interventional thermal therapy procedures on the human body (Lewa & Certaines, 1994). Those measurements are based on the sensitivity of water proton MRI parameters to temperature, including the chemical shift (Hall & Talagala, 1985), diffusion coefficient and relaxation times T1 (Doran et al ., 1994) and T2 (Jezzard et al ., 1992).…”

Section: Mrimentioning

confidence: 99%

Three‐dimensional MRI mapping of minimum temperatures achieved in microwave and conventional food processing

Bows

Patrick

Nott

et al. 2001

Int J of Food Sci Tech

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Microbiological assurance protocols for food preservation are based on the ‘worst‐case’ slowest heating point within the food product. For conduction‐limited processing, this leads to well‐known overheating near surface regions of products, with resultant quality loss. For volumetric heating processes such as microwave heating, it is practically impossible to guarantee where the slowest heating point will be. Consequently, microwave heating regimes are generally excessive and product quality is often similar to conventional conduction‐limited heating processes. It is well known that Magnetic Resonance Imaging (MRI) can provide three‐dimensional (3D) images which quantify the spatial distribution of water in foods, and also that the MRI parameters of water are temperature dependent. The present study demonstrates that a combination of these two concepts has led to a new approach for the validation of thermal processing in food manufacture. The potential for on‐line assurance of minimum and maximum temperatures for manufacture of microbiologically assured, minimally processed, high quality food is discussed.

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Section: Mrimentioning

confidence: 99%

Three‐dimensional MRI mapping of minimum temperatures achieved in microwave and conventional food processing

Bows

Patrick

Nott

et al. 2001

Int J of Food Sci Tech

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“…MURPS was implemented on a Signa 1.5T LX system for dynamic temperature monitoring using the proton resonant shift method (19–21). A glass tube was inserted into the center of an orange and placed in the MRI system.…”

Section: Methodsmentioning

confidence: 99%

“…For each voxel, a time series of 252 phase‐difference values was obtained. These were then converted directly to temperature change given a reported shift in the proton resonance of approximately 0.011 ppm per °C of change (21). Prior to conversion from phase to temperature values, the phase was “unwrapped” using a library function in Matlab (The Mathworks, Natick, MA) that removes abrupt wraparound phase changes.…”

Section: Methodsmentioning

confidence: 99%

Dynamic imaging with multiple resolutions along phase‐encode and slice‐select dimensions

Panych

Zhao

Jólesz

et al. 2001

Magnetic Resonance in Med

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An implementation is reported of an imaging method to obtain MUltiple Resolutions along Phase-encode and Slice-select dimensions (MURPS), which enables dynamic imaging of focal changes using a graded, multiresolution approach. MURPS allows one to trade spatial resolution in part of the volume for improved temporal resolution in dynamic imaging applications. A unique method of Hadamard slice encoding is used, enabling the varying of the phase encode and slice resolution while maintaining a constant effective TR throughout the entire 3-D volume. MURPS was implemented using a gradient-recalled echo sequence, and its utility was demonstrated for MR temperature monitoring. In this preliminary work, it has been shown that changes throughout a large volume can be effectively monitored in times that would normally only permit dynamic imaging in one or a very few slices. Magn Reson Med 45:940 -947, 2001.

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“…Several methods have been explored for measuring temperatures using MR imaging including measurement of the apparent diffusion constant, measurement of T1 or T2 relaxation constants, and measurement of temperature dependent chemical shift [31]. In particular, a number of investigators have reported successful application of proton resonance frequency (PRF) shift imaging for accurate non-invasive measurement of temperature [10,[32][33][34][35][36][37].…”

Section: Magnetic Resonance Thermal Imagingmentioning

confidence: 99%

MRI-guided laser thermal therapy in the prostate: preliminary results

et al. 2004

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Minimally invasive thermal therapies for the treatment of prostate cancer offer potential to reduce cost, treatment time, and patient trauma. A drawback to such therapies is that it is often difficult or impossible to know the exact volume of tissue which is being destroyed. In this work, we report on the use of magnetic resonance (MR) thermal imaging to provide real-time feedback control over laser interstitial thermal therapy (LITT) in an in vivo canine prostate model.

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Body Temperature Mapping by Magnetic Resonance Imaging

Cited by 16 publications

References 57 publications

Three‐dimensional MRI mapping of minimum temperatures achieved in microwave and conventional food processing

Three‐dimensional MRI mapping of minimum temperatures achieved in microwave and conventional food processing

Dynamic imaging with multiple resolutions along phase‐encode and slice‐select dimensions

MRI-guided laser thermal therapy in the prostate: preliminary results

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