. Author manuscript; available in PMC: 2013 May 5.

Published in final edited form as: Magn Reson Med. 2011 Aug 25;67(2):353–362. doi: 10.1002/mrm.23010

Table 4.

The Iterative reVERSE Approach was Demonstrated With Dual-Band Excitations by Comparing Three Different Initial Designs

G_max (mT/m) Initial design	L	Pulse duration (ms)		Peak \|B_1,_n\|				Profile NRMSE (%)
G_max (mT/m) Initial design	L	REV⁰	REV^L	REV⁰	VER	REV¹	REV^L	REV⁰	VER	REV¹	REV^L
5.0	4	9.18	4.89	1.78	0.90	1.18	0.97	0.45	7.21	0.45	0.44
10.0	2	5.49	5.28	3.70	0.90	1.30	0.99	0.64	3.58	0.69	0.69
∞	3	4.31	5.46	6.89	0.90	2.08	0.98	1.22	5.42	1.55	1.21

G_max, maximum gradient amplitude constraint of the initial design; L, number of iterations of the final reVERSE pulse; REVl, lth reVERSE pulse (REV⁰ is the original pulse); VER, VERSE pulse. Each initial pulse was designed with a specified maximum gradient amplitude constraint as shown in the leftmost column. The target peak |B_1,_n| of VERSE reshaping was set to 0.9, lower than the the nominal target magnitude of 1.0, for a faster convergence. Note that the same G_max = 40 mT/m constraint was used for VERSE and reVERSE operations.