Publikationsdatum:
2011-08-24
Beschreibung:
We describe a device for performing MRI with laser-polarized noble gas at low magnetic fields (〈50 G). The system is robust, portable, inexpensive, and provides gas-phase imaging resolution comparable to that of high field clinical instruments. At 20.6 G, we have imaged laser-polarized (3)He (Larmor frequency of 67 kHz) in both sealed glass cells and excised rat lungs, using approximately 0.1 G/cm gradients to achieve approximately 1 mm(2) resolution. In addition, we measured (3)He T(2)(*) times greater than 100 ms in excised rat lungs, which is roughly 20 times longer than typical values observed at high ( approximately 2 T) fields. We include a discussion of the practical considerations for working at low magnetic fields and conclude with evidence of radiation damping in this system. Copyright 1999 Academic Press.
Schlagwort(e):
Life Sciences (General)
Materialart:
Journal of magnetic resonance (San Diego, Calif. : 1997) (ISSN 1090-7807); Volume 141; 2; 217-27
Format:
text
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