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Magnetic Resonance Materials in Physics, Biology and Medicine

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04.12.2018 | Research Article

A phase-cycled temperature-sensitive fast spin echo sequence with conductivity bias correction for monitoring of mild RF hyperthermia with PRFS

verfasst von: Mingming Wu, Hendrik T. Mulder, Yuval Zur, Silke Lechner-Greite, Marion I. Menzel, Margarethus M. Paulides, Gerard C. van Rhoon, Axel Haase

Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 3/2019

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Abstract

Objective

Mild hyperthermia (HT) treatments are generally monitored by phase-referenced proton resonance frequency shift calculations. A novel phase and thus temperature-sensitive fast spin echo (TFSE) sequence is introduced and compared to the double echo gradient echo (DEGRE) sequence.

Theory and methods

For a proton resonance frequency shift (PRFS)-sensitive TFSE sequence, a phase cycling method is applied to separate even from odd echoes. This method compensates for conductivity change-induced bias in temperature mapping as does the DEGRE sequence. Both sequences were alternately applied during a phantom heating experiment using the clinical setup for deep radio frequency HT (RF-HT). The B₀ drift-corrected temperature values in a region of interest around temperature probes are compared to the temperature probe data and further evaluated in Bland–Altman plots. The stability of both methods was also tested within the thighs of three volunteers at a constant temperature using the subcutaneous fat layer for B₀-drift correction.

Results

During the phantom heating experiment, on average TFSE temperature maps achieved double temperature-to-noise ratio (TNR) efficiency in comparison with DEGRE temperature maps. In-vivo images of the thighs exhibit stable temperature readings of ± 1 °C over 25 min of scanning in three volunteers for both methods. On average, the TNR efficiency improved by around 25% for in vivo data.

Conclusion

A novel TFSE method has been adapted to monitor temperature during mild HT.

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Titel: A phase-cycled temperature-sensitive fast spin echo sequence with conductivity bias correction for monitoring of mild RF hyperthermia with PRFS
verfasst von: Mingming Wu
Hendrik T. Mulder
Yuval Zur
Silke Lechner-Greite
Marion I. Menzel
Margarethus M. Paulides
Gerard C. van Rhoon
Axel Haase
Publikationsdatum: 04.12.2018
Verlag: Springer International Publishing
Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine / Ausgabe 3/2019
Print ISSN: 0968-5243
Elektronische ISSN: 1352-8661
DOI: https://doi.org/10.1007/s10334-018-0725-5

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A phase-cycled temperature-sensitive fast spin echo sequence with conductivity bias correction for monitoring of mild RF hyperthermia with PRFS