Figure 5.

(a) Absolute SNR (shaded boxes, in ml⁻¹ Hz^1∕2) computed by EM MoM at ρ=1 cm from the junction for antennae made with λ_c∕4 cable portions tuned at 0.5, 1, 1.5, 2, 3, 4, 4.7, and 5 T in the 0.35% saline (squares). Experimental values measured at 1.5, 3, and 4.7 T (stars) are overlaid. The data are best fit to a curve of the form $B_0^2$ (solid). Experimental data are corrected to eliminate contributions from system noise (NF), but all data include cable losses. The dotted curves show the 95% confidence interval for the fitted curve. (b) Absolute computed SNR performance of the loopless antenna in blood based on the electrical properties in Table 1. This SNR has a 7∕4th power dependence on B₀.