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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 3He (Larmor frequency of 67 kHz) in both sealed glass cells and excised rat lungs, using ∼0.1 G/cm gradients to...
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