10.1371/journal.pone.0118892.g004 Manli Song Manli Song Jyh-Horng Chen Jyh-Horng Chen Ji Chen Ji Chen In-Tsang Lin In-Tsang Lin The comparison of SNR gain with the HTS surface resonator at 77 K, the copper surface resonator at 300 K, the copper surface resonator at 77 K, the QD surface resonator at 300 K with the distance of 5 mm and the QD surface resonator at 300 K close to the phantom. Public Library of Science 2015 300 K 35 mm Quadrature Surface Resonator 40 mm diameter Bi 2Sr SNR gains 3 T MRI Imager SNR gain 77 K 35 mm surface resonator HTS surface resonator QD surface resonator 2015-03-26 04:45:27 Figure https://plos.figshare.com/articles/figure/_The_comparison_of_SNR_gain_with_the_HTS_surface_resonator_at_77_K_the_copper_surface_resonator_at_300_K_the_copper_surface_resonator_at_77_K_the_QD_surface_resonator_at_300_K_with_the_distance_of_5_mm_and_the_QD_surface_resonator_at_300_K_close_to_the_ph/1357682 <p>(a) It clearly shows almost no increase in signal intensity and mainly from the loss of noise. (b) The SNR gain of the HTS surface resonator at 77 K over the QD surface resonator at 300 K and professionally-made copper surface resonator at 77 K/ 300 K.</p>