Ke Feng1, Neal Anthony Hollingsworth1, John Carl Bosshard1, Douglas C. Noll2, Steven M. Wright1
1Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA; 2Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA
Using a vector modulator system constructed for B1 shimming, full capability of high speed modulation for more complex transmit pulses is shown. By exciting the vector modulators with a hard pulse from a host Varian Inova system, and analog modulation control signals from a D/A card, each board is able to create four completely independent RF waveforms. In order to test the system, one channel was used to create a checkerboard pattern, and the results are shown to be comparable to the Varian Inova system.