Low field magnetic resonance images of polarized noble gases obtained with a dc superconducting quantum interference device

Using a low transition temperature superconducting quantum interference device as a detector, we have obtained magnetic resonance images of laser-polarized ${}^3\mathrm{He}$ gas and solid ${}^{129}\mathrm{Xe}$ at 4.2 K in magnetic fields as low as 0.54 mT ${(}^3\mathrm{He})$ and 1 mT ${(}^{129}\mathrm{Xe}\mathrm{),}$ corresponding to Larmor frequencies of 17.6 and 11.8 kHz, respectively. The experimental resolution of the images is $\text{∼500\hspace{0.17em}μ}\mathrm{m}$ for ${}^3\mathrm{He}$ in the gas phase and $\text{∼950\hspace{0.17em}μ}\mathrm{m}$ for ${}^{129}\mathrm{Xe}$ in the solid state.