Temperature Mapping using the water proton chemical shift: A chemical shift selective phase mapping method

Kuroda, Kagayaki; Oshio, Koichi; Chung, Angie Y.; Hynynen, Kullervo; Jólesz, Ferenc A.

doi:10.1002/mrm.1910380523

Cited by 122 publications

(97 citation statements)

References 18 publications

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“…Here the frequency shift is calculated from the MR spectra. The shift is measured between the water peak and a reference peak that remains constant with temperature, such as lipids (48) or N-acetyl-aspartate in the brain (49). This internal reference makes spectroscopic methods relatively immune to field drifts and interscan motion and allows for absolute temperature measurements (49), which have been demonstrated in the human brain (50).…”

Section: Spectroscopic Imaging Using the Prf Shiftmentioning

confidence: 99%

MR thermometry

Rieke

Pauly

2008

Magnetic Resonance Imaging

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952

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Minimally invasive thermal therapy as local treatment of benign and malignant diseases has received increasing interest in recent years. Safety and efficacy of the treatment require accurate temperature measurement throughout the thermal procedure. Noninvasive temperature monitoring is feasible with magnetic resonance (MR) imaging based on temperature-sensitive MR parameters such as the proton resonance frequency (PRF), the diffusion coefficient (D), T 1 and T 2 relaxation times, magnetization transfer, the proton density, as well as temperature-sensitive contrast agents. In this article the principles of temperature measurements with these methods are reviewed and their usefulness for monitoring in vivo procedures is discussed. Whereas most measurements give a temperature change relative to a baseline condition, temperature-sensitive contrast agents and spectroscopic imaging can provide absolute temperature measurements. The excellent linearity and temperature dependence of the PRF and its near independence of tissue type have made PRF-based phase mapping methods the preferred choice for many in vivo applications. Accelerated MRI imaging techniques for real-time monitoring with the PRF method are discussed. Special attention is paid to acquisition and reconstruction methods for reducing temperature measurement artifacts introduced by tissue motion, which is often unavoidable during in vivo applications.

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Section: Spectroscopic Imaging Using the Prf Shiftmentioning

confidence: 99%

MR thermometry

Rieke

Pauly

2008

Magnetic Resonance Imaging

1,006

952

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“…The acquired signals (Eq. [1]) can be used in a variety of ways to calculate ⌬ T and the corresponding temperature map. We have investigated two ways that we believe are the most practical and robust ones.…”

Section: Theorymentioning

confidence: 99%

“…Since the fat signal does not exhibit the temperaturedependent resonant frequency shift, the phase maps and spectra acquired during fat-selective acquisitions have been utilized for correcting the deleterious effect of field disturbances onto the resulting PRFS temperature maps (1)(2)(3). However, magnetic field disturbances are known to influence the quality of fat-water separation, making fat-and water-selective pulses less selective and adding undesired signal from the "to-be-suppressed" component to the desired signal from the imaged component.…”

mentioning

confidence: 99%

“…However, magnetic field disturbances are known to influence the quality of fat-water separation, making fat-and water-selective pulses less selective and adding undesired signal from the "to-be-suppressed" component to the desired signal from the imaged component. While the subtraction of fat phase maps from water ones still compensates for field disturbances and suboptimal fat-water separation to some extent, the temperature estimation error grows proportionally to the ratio of the imaged and "to-be-suppressed" signal amplitudes (1).…”

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confidence: 99%

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Correction of proton resonance frequency shift temperature maps for magnetic field disturbances using fat signal

Shmatukha¹,

Harvey²,

Bakker³

2007

Magnetic Resonance Imaging

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Purpose:To improve the immunity of the proton resonance frequency shift (PRFS) method of MRI temperature mapping against magnetic field disturbances. Since PRFS is a phase-sensitive method, it misinterprets magnetic field disturbances as artifact temperature changes. If not corrected, the resulting temperature artifacts can completely obscure the true temperature estimation, especially if the temperature elevations are small. Materials and Methods:Since the fat protons experience the same magnetic field disturbances as the water protons, but no temperature-related frequency shift, the fat signal has been used for correcting PRFS temperature maps for the disturbances. A simple correction method is proposed that has either better compensation capability than the phase correction methods previously reported or higher spatial and temporal resolution than the spectroscopic correction methods previously reported. The evaluated method is based on the utilization of several gradient and spin echoes acquired within one repetition interval with waterand fat-selective scans. Results:In a series of phantom experiments, the improved method is shown to enable the reconstruction of accurate temperature maps in spite of interscan motion, suboptimal fat-water separation, and a wide range of magnetic field disturbances. Conclusion:Our approach can be used for the guidance of thermal therapies involving tissues containing fat or surrounded by fat. THE ABILITY TO MEASURE small temperature changes, with high accuracy, using MRI, has many potential clinical applications; for instance, specific absorption rate (SAR) management or thermal ablation surgery guidance. The proton resonance frequency shift (PRFS) method is the most widely used method for MRI temperature monitoring because it does not depend on the imaged tissue and thus does not require any calibrations for a particular patient or anatomy. However, the temperature sensitivity of the method comes from the phase accumulated by water protons before the echo acquisition. In addition to the temperature-related term, the accumulated phase also contains contributions from all factors influencing the local magnetic field within the imaged anatomy; for instance, main and shimming field drifts, susceptibility changes resulting from breathing and/or anatomy repositioning, tissue property and perfusion changes with temperature, etc. As the demand for the increase of spatial, temporal, and temperature resolution of MRI temperature maps is growing, these disadvantages become even more restrictive.Since the fat signal does not exhibit the temperaturedependent resonant frequency shift, the phase maps and spectra acquired during fat-selective acquisitions have been utilized for correcting the deleterious effect of field disturbances onto the resulting PRFS temperature maps (1-3). However, magnetic field disturbances are known to influence the quality of fat-water separation, making fat-and water-selective pulses less selective and adding undesired signal from the "to-be-suppressed" componen...

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“…Thus, their resonance frequencies have much smaller temperature dependence. If these resonances are sufficiently distinct from the water proton resonant frequency, such compounds can provide a temperature-independent reference to correct for systematic errors in MR thermometry [4].…”

Section: Introductionmentioning

confidence: 99%

Measuring temperature using MRI: a powerful and versatile technique

Turner

Streicher

2012

Magn Reson Mater Phy

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The Larmor frequency of water protons has reliably linear temperature dependence. Since this frequency shift is easily measurable using relatively simple MRI techniques, a remarkable opportunity arises for uniquely non-invasive and accurate temperature evaluation, deep within any water-containing object. Major applications are appearing in the field of image-guided surgery. The cutting-edge papers collected in this Special Issue demonstrate both the versatility and the power of MRI thermometry.

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Temperature Mapping using the water proton chemical shift: A chemical shift selective phase mapping method

Cited by 122 publications

References 18 publications

MR thermometry

MR thermometry

Correction of proton resonance frequency shift temperature maps for magnetic field disturbances using fat signal

Measuring temperature using MRI: a powerful and versatile technique

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