Effects of air susceptibility on proton resonance frequency MR thermometry

Streicher, Markus; Schäfer, Andreas; Reimer, Enrico; Dhital, Bibek; Trampel, Robert; Ivanov, Dimo; Turner, Robert

doi:10.1007/s10334-011-0249-8

Cited by 17 publications

(16 citation statements)

References 23 publications

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“…As an example, the severe over-and underestimation of PRF readings due to perfusion changes in muscle and tumour tissue is demonstrated in Figure 1b. In general alterations in the concentration of oxygen, which in its pure form is paramagnetic and diamagnetic when bound to hemoglobin (oxyhemoglobin) affect the local static magnetic field (49,68). The direction of perfusion influences these local field changes (69).…”

Section: Perfusionmentioning

confidence: 99%

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Winter

Oberacker

Paul

et al. 2015

International Journal of Hyperthermia

185

165

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Clinically established thermal therapies like thermo ablative approaches or adjuvant hyperthermia treatment rely on accurate thermal dose information for the evaluation and adaptation of the thermal therapy. Intratumoral temperature measurements have been correlated successfully with clinical endpoints. Magnetic resonance imaging is the most suitable technique for non-invasive thermometry avoiding complications related to invasive temperature measurements. Since the advent of MR thermometry two decades ago, numerous MR thermometry techniques have been developed continuously increasing accuracy and robustness for in vivo applications. While this progress was primarily focused on relative temperature mapping, current and future efforts will likely close the gap towards quantitative temperature readings. These efforts are essential to benchmark thermal therapy efficiency, understand temperature related biophysical and physiological processes and to use these insights to set new landmarks for diagnostic and therapeutic applications. With that in mind, this review summarizes and discusses advances in MR thermometry providing practical considerations, pitfalls and technical obstacles constraining temperature measurement accuracy, spatial and temporal resolution in vivo. Established approaches and current trends in thermal therapy hardware are surveyed with respect to potential benefits for MR thermometry.3

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Section: Perfusionmentioning

confidence: 99%

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Winter

Oberacker

Paul

et al. 2015

International Journal of Hyperthermia

185

165

View full text Add to dashboard Cite

show abstract

“…These include a) drift in the static field [146], b) patient motion [16,63,147], c) local or global changes in magnetic susceptibility (e.g. due to tissue swelling [148], fat [46,161] air [149], movement of interstitial applicators [43] or injection of contrast agent [150]), which can be altered by heating itself [49]. For example, although the screening constant of fat is not temperature-dependent, its susceptibility is, and so is the susceptibility of every other tissue, thus introducing weak tissue-type dependence.…”

Section: Limitations In Methods Based On the Chemical Shift Of Water mentioning

confidence: 99%

MRI for Noninvasive Thermometry

Kardoulaki

Syms

Young

2016

eMagRes

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“…They may arise from organ movement [6,7], tissue susceptibility changes due to freezing [8] or fat susceptibility change due to the temperature changes [9]. They may even be caused by susceptibility changes in surrounding air [10].…”

Section: Contentsmentioning

confidence: 99%

“…Streicher et al [10] showed in measurements and simulations that air susceptibility change with temperature has a measurable effect on uncorrected MR thermometry and an even stronger effect when oxygen concentration is changed. This effect can lead to PRF temperature errors of up to 40 K.…”

Section: Contentsmentioning

confidence: 99%

Measuring temperature using MRI: a powerful and versatile technique

Turner

Streicher

2012

Magn Reson Mater Phy

Self Cite

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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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Effects of air susceptibility on proton resonance frequency MR thermometry

Cited by 17 publications

References 23 publications

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

Magnetic resonance thermometry: Methodology, pitfalls and practical solutions

MRI for Noninvasive Thermometry

Measuring temperature using MRI: a powerful and versatile technique

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