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Abstract #0271

High Resolution TRASE by Rapid Echo Encoding with Twisted Solenoid RF Phase Gradient Coils

Hongwei Sun1, Aaron Purchase1, Abbas AlZubaidi2, Pallavi Bohidar2, Gordon Sarty2, Boguslaw Tomanek1, and Jonathan C. Sharp1

1Department of Onoclogy, University of Alberta, Edmonton, AB, Canada, 2Department of Biomedical Engineering, University of Saskatchewan, Saskatoon, SK, Canada

TRASE is an MRI k-space encoding method that uses radio-frequency transmit phase gradient fields to achieve millimeter-level spatial resolution. To avoid resolution loss, the total echo train duration should be less than 1.2 times T2. However, previously demonstrated TRASE experiments have been limited by a large echo spacing (~1100 us). Here we present the use of the twisted solenoid to achieve short echo spacing of ~370 us, while remaining within SAR limits. This rapid echo encoding will enable in vivo imaging of short T2 tissues (e.g. ~50ms T2 for muscle at 0.2T) with resolution of 1.2 mm per pixel.

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