. Author manuscript; available in PMC: 2014 Jul 1.

Published in final edited form as: Magn Reson Med. 2012 Aug 8;70(1):259–268. doi: 10.1002/mrm.24432

Table 1.

DGF calculations of B₁⁺ characteristics for sodium birdcages with a range of diameters and lengths. Values in each cell are: peak B₁⁺ normalized to the peak value for the birdcage with 22.9 cm diameter and 16 cm length, B₁⁺ FWHM (cm), and the ratio of B₁⁺ at x = 0, y = 0, z = 6 cm to B₁⁺ at the origin. Values for the dimensions of the constructed coil are highlighted in gray.

	Diameter (cm)

	22.9			25.4			27.9

Length (cm)	Peak B₁⁺	FWHM (cm)	B₁⁺ ratio	Peak B₁⁺	FWHM (cm)	B₁⁺ ratio	Peak B₁⁺	FWHM (cm)	B₁⁺ ratio
16	1.00	16.5	0.70	0.97	17.5	0.72	0.94	19.0	0.75
18	0.95	18.5	0.76	0.93	19.5	0.77	0.91	20.5	0.79
20	0.90	20.5	0.82	0.89	21.0	0.82	0.88	22.0	0.83
22	0.85	22.5	0.88	0.85	23.0	0.87	0.84	24.0	0.86
24	0.81	24.5	0.93	0.81	25.0	0.91	0.81	25.5	0.90