Mitigation of B1+ inhomogeneity on single-channel transmit systems with TIAMO
Version of Record online: 8 AUG 2012
Copyright © 2012 Wiley Periodicals, Inc.
Magnetic Resonance in Medicine
Volume 70, Issue 1, pages 290–294, July 2013
How to Cite
Orzada, S., Johst, S., Maderwald, S., Bitz, A. K., Solbach, K. and Ladd, M. E. (2013), Mitigation of B1+ inhomogeneity on single-channel transmit systems with TIAMO. Magn Reson Med, 70: 290–294. doi: 10.1002/mrm.24453
- Issue online: 20 JUN 2013
- Version of Record online: 8 AUG 2012
- Manuscript Accepted: 11 JUL 2012
- Manuscript Revised: 5 JUL 2012
- Manuscript Received: 18 MAY 2012
- 7 Tesla;
- B1 Inhomogeneity
In magnetic resonance imaging, there has been a constant drive to higher static magnetic field strengths (B0) to achieve a higher signal-to-noise ratio and new or enhanced contrasts. In today's high-field systems, severe problems regarding the homogeneity of the transmission field are encountered. Recently, an acquisition scheme called Time-Interleaved Acquisition of Modes has been proposed to tackle the inhomogeneity problems in high-field magnetic resonance imaging. The basic premise is to excite two (or more) different B modes using static radiofrequency shimming in an interleaved acquisition, where the complementary radiofrequency patterns of the two modes can be exploited to improve overall signal homogeneity. In its usual implementation, a multichannel transmit system is required. In this work, the goal is to present a simple and inexpensive hardware setup which makes it possible to use time-interleaved acquisition of modes on any single-channel transmit system while making use of the vendor-provided single-channel radiofrequency safety system. To demonstrate the efficacy of this setup, spin echo images from the pelvis are acquired at 7 T exhibiting no complete signal dropouts. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.