Performance study of aluminum shielded room for ultra-low-field magnetic resonance imaging based on SQUID: Simulations and experiments

Li Bo^{1, 2, 3}, Dong Hui^{2, 3}, Huang Xiao-Lei^{2, 3, 4}, Qiu Yang^{1, 2, 3}, Tao Quan^{2, 3}, Zhu Jian-Ming^{1, †}

(a) Broadband noise specturm, and (b) noise in image bandwidth measured by the second-order SQUID gradiometer in the free space (black), and in the 3-mm-thick shielded room (gray). Panels (c) and (d) are the broadband noise and image-band noise spectra measured in the free space (black), and in the magnetically shielded barrel (gray).