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  MRI of the human brain at 130 microtesla

Inglis, B., Buckenmaier, K., SanGiorgio, P., Pedersen, A., Nichols, M., & Clarke, J. (2013). MRI of the human brain at 130 microtesla. Proceedings of the National Academy of Sciences of the United States of America, 110(48), 19194-19201. doi:10.1073/pnas.1319334110.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1492-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-3D87-3
Genre: Journal Article

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http://www.pnas.org/cgi/reprint/110/48/19178 (Publisher version)
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Inglis, B, Author
Buckenmaier, K1, Author              
SanGiorgio , P, Author
Pedersen, AF, Author
Nichols, MA, Author
Clarke, J, Author
Affiliations:
1Department of Physics, University of California, Berkeley, ou_persistent22              

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 Abstract: We present in vivo images of the human brain acquired with an ultralow field MRI (ULFMRI) system operating at a magnetic field B0 ∼ 130 μT. The system features prepolarization of the proton spins at Bp ∼ 80 mT and detection of the NMR signals with a superconducting, second-derivative gradiometer inductively coupled to a superconducting quantum interference device (SQUID). We report measurements of the longitudinal relaxation time T1 of brain tissue, blood, and scalp fat at B0 and Bp, and cerebrospinal fluid at B0. We use these T1 values to construct inversion recovery sequences that we combine with Carr–Purcell–Meiboom–Gill echo trains to obtain images in which one species can be nulled and another species emphasized. In particular, we show an image in which only blood is visible. Such techniques greatly enhance the already high intrinsic T1 contrast obtainable at ULF. We further present 2D images of T1 and the transverse relaxation time T2 of the brain and show that, as expected at ULF, they exhibit similar contrast. Applications of brain ULFMRI include integration with systems for magnetoencephalography. More generally, these techniques may be applicable, for example, to the imaging of tumors without the need for a contrast agent and to modalities recently demonstrated with T1ρ contrast imaging (T1 in the rotating frame) at fields of 1.5 T and above.

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 Dates: 2013-11
 Publication Status: Published in print
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 Identifiers: DOI: 10.1073/pnas.1319334110
BibTex Citekey: InglisBSPNC2013
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 110 (48) Sequence Number: - Start / End Page: 19194 - 19201 Identifier: -