Skip to main content
. Author manuscript; available in PMC: 2010 Nov 19.
Published in final edited form as: NMR Biomed. 2009 Dec 15;23(4):368–374. doi: 10.1002/nbm.1471

Figure 2.

Figure 2

Comparison of the standard B0 and B1+ maps and the RF transmitter calibration images of the phantom acquired with nominal 90° at on-resonance and 100-, 300-, and 500-Hz off-resonance. Standard B0 map (A) and B1+ map (B) acquired in an axial plane at magnet isocenter. Image-guided RF calibration images at on-resonance (C) and 100-, 300-, and 500-Hz off-resonance (D–F) are shown. The image-guided RF calibration sequence is relatively insensitive to off-resonance up to 300 Hz. Note that the dark regions correspond to locations where the RF excitation is approximately 90°.