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Fast accurate MR thermometry using phase referenced asymmetric spin-echo EPI at high field

MPS-Authors
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Streicher,  Markus
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Schäfer,  Andreas
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Ivanov,  Dimo
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Müller,  Dirk K.
Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Reimer,  Enrico
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Huber,  Laurentius
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Dhital,  Bibek
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Rivera,  Deborah
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Kögler,  Carsten
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Trampel,  Robert
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Pampel,  André
Methods and Development Unit Nuclear Magnetic Resonance, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Turner,  Robert
Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society;

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Citation

Streicher, M., Schäfer, A., Ivanov, D., Müller, D. K., Amadon, A., Reimer, E., et al. (2014). Fast accurate MR thermometry using phase referenced asymmetric spin-echo EPI at high field. Magnetic Resonance in Medicine, 71(2), 524-533. doi:10.1002/mrm.24681.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-7DE9-F
Abstract
Purpose: A novel highly accurate method for MR thermometry, effective at high field, is introduced and validated, which corrects for slow and fast field fluctuations by means of reference images. Methods: An asymmetric spin-echo (ASE) EPI sequence was made frequency-selective to water or a reference substance by controlling the slice-select gradient polarity, or the durations of the excitation and refocusing RF pulses. Images were acquired pairwise, and the temperature-sensitive water images were corrected for field fluctuations using the reference images. In a phantom RF heating experiment, dissolved dimethyl sulfoxide was used as a reference substance. Temperature stability was tested in-vivo on the human brain, referenced using subcutaneous scalp fat. Water and fat phase images were acquired only 50 ms apart. Bloch simulations validated the frequency selection accuracy. Results: ASE imaging using simple frequency selection methods provides highly accurate referenced MR thermometry in phantoms and in-vivo at 7 Tesla. Effects of field fluctuations caused by field drift, breathing and heart beat were corrected. The technique is highly robust against B1 inhomogeneities. Conclusion: Frequency selection using gradient-reversal can enable fast accurate referenced in-vivo MR thermometry, assisting thermal characterization of RF coils and possibly in-vivo SAR monitoring.