Table 1. Comparison of the Returned Signal with the Two Configurations of Capsules with the Fixed Pitch and Optimized Variable-Pitch Coils: PSL Sequence, 12 Repeats of the Same Measurement Averaged.

	fixed pitch	optimized variable-pitch
Q (loaded)	87	76
Peak Height (×10–8) of Returned Signal
rows of capsules in center	6.04	4.42
rows of capsules at ends	5.15	4.81
average	5.60	4.62
variation about mean	±8%	±4%