Human magnetic resonance imaging at 8 T

In this work, we present the first human magnetic resonance image (MRI) obtained at ultrahigh field strengths (8 T). We demonstrate that clinical imaging will be possible at 8 T and that reasonable quality head images can be obtained at this field strength. Most importantly, we emphasize that the po...

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Bibliographic Details
Published in:	NMR in biomedicine Vol. 11; no. 6; pp. 263 - 265
Main Authors:	Robitaille, P.-M. L., Abduljalil, A. M., Kangarlu, A., Zhang, X., Yu, Y., Burgess, R., Bair, S., Noa, P., Yang, L., Zhu, Hui, Palmer, B., Jiang, Z., Chakeres, D. M., Spigos, D.
Format:	Journal Article
Language:	English
Published:	New York John Wiley & Sons, Ltd 01-10-1998 Wiley
Subjects:	Biological and medical sciences Brain - anatomy & histology Humans Investigative techniques, diagnostic techniques (general aspects) Magnetic Resonance Imaging - methods Medical sciences Nervous system Radiodiagnosis. Nmr imagery. Nmr spectrometry RF power thermal absorption ultra high field Human Image quality Absorption Device Central nervous system High field Medical imagery Technique Nuclear magnetic resonance imaging Energy level Brain (vertebrata)
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Summary:	In this work, we present the first human magnetic resonance image (MRI) obtained at ultrahigh field strengths (8 T). We demonstrate that clinical imaging will be possible at 8 T and that reasonable quality head images can be obtained at this field strength. Most importantly, we emphasize that the power required to excite the spins at 8 T is much lower than had previously been predicted by the nuclear magnetic resonance theory. A 90° pulse in the head at 8 T requires only ∼0.085 J of energy (90 W for a 2‐lobe 4 ms sinc pulse). Based on measurements at 4 T, 1–2 J of energy should have been utilized to achieve a 90° excitation at 8 T. The fact that the energy required for spin excitation at 8 T is much lower than predicted by the NMR theory, will be extremely important to the viability of ultrahigh field imaging, since concerns related to power absorption and specific absorption rate (SAR) violations at ultrahigh field are alleviated. As such, it will be possible to utilize RF intensive pulse sequences and adiabatic spin excitation at 8 T without significant risk to the subject. © 1998 John Wiley & Sons, Ltd.
Bibliography:	ArticleID:NBM549 istex:085D9778312A0171D610BE5E208C71BB2C999ECB ark:/67375/WNG-0V92RCP7-M NIM - No. ML45120 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0952-3480 1099-1492
DOI:	10.1002/(SICI)1099-1492(199810)11:6<263::AID-NBM549>3.0.CO;2-0