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Abstract #4511

Performance of Short, Gradient Modulated RF Pulses due to Asynchrony Between RF and Gradient Waveforms

Chathura Kumaragamage1, Peter B Brown1, Scott McIntyre1, Terence W Nixon1, Henk M De Feyter1, and Robin A de Graaf1
1Radiology and Biomedical Imaging, Yale University, New Haven, CT, United States


The effect of asynchrony between RF and gradient modulated (GM) waveforms on the performance of 3 ms gradient modulated GOIA-WURST RF pulses (BW = 15 kHz) was evaluated in simulation and experimentally. Results demonstrate that a 20+ μs asynchrony between RF and GM functions substantially degrades inversion performance when using large RF offsets to achieve translation. A projection-based method is presented that was used to calibrate RF and GM asynchrony on a 4T human MR system, where a ~40 µs asynchrony was present. The projection method allows a quick calibration of RF and GM asynchrony on pre-clinical/clinical MR systems.

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