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Abstract #4633

A Novel Approach to Investigate 1D TRASE MRI Pulse Sequence Performance in Imperfect B1 Fields

Pallavi Bohidar1, Hongwei Sun2, Gordon Sarty1, and Jonathan Sharp2

1University of Saskatchewan, Saskatoon, SK, Canada, 2University of Alberta, Edmonton, AB, Canada

The Transmit Array Spatial Encoding (TRASE) MRI technique uses transmit radio-frequency (RF) magnetic field (B1) phase gradients for spatial encoding. Imaging performance is reliant on |B1| homogeneity. This study investigates the performance of a set of variants of 1-dimensional TRASE under conditions of |B1| inhomogeneity. Both Bloch equation simulations and experimental confirmations are presented. Results show that one variant of the sequence allows imaging over ~90% of the FOV for Δ|B1| = ± 15% allowing the use of practical B1 transmit coil designs. This improves upon the previous sequence which generated ~75% usable field-of-view (FOV).

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