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Magn Reson Med. 2013 Nov 26. doi: 10.1002/mrm.25060. [Epub ahead of print]

Prototype phantoms for characterization of ultralow field magnetic resonance imaging.

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  • 1Electromagnetics Division, National Institute of Standards and Technology, Boulder, Colorado, USA.

Abstract

PURPOSE:

Prototype phantoms were designed, constructed, and characterized for the purpose of calibrating ultralow field magnetic resonance imaging (ULF MRI) systems. The phantoms were designed to measure spatial resolution and to quantify sensitivity to systematic variation of proton density and relaxation time, T1 .

METHODS:

The phantoms were characterized first with conventional magnetic resonance scanners at 1.5 and 3 T, and subsequently with a prototype ULF MRI scanner between 107 and 128 μT .

RESULTS:

The ULF system demonstrated a 2-mm spatial resolution and, using T1 measurements, distinguished aqueous solutions of MnCl2 differing by 20 μM  [Mn2+ ].

CONCLUSION:

The prototype phantoms proved well-matched to ULF MRI applications, and allowed direct comparison of the performance of ULF and clinical systems. Magn Reson Med, 2013. © 2013 Wiley Periodicals, Inc.

Copyright © 2013 Wiley Periodicals, Inc.

KEYWORDS:

T1; phantom; proton density; spatial resolution; superconducting quantum interference device; ultralow field; ultralow field magnetic resonance imaging

PMID:
24281979
[PubMed - as supplied by publisher]
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