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.

<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>