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Abstract #4538

Improved Radial Spoiled Gradient Echo Imaging with Randomized RF Phases and Gradient Moments

Wei Lin1, Hee Kwon Song1

1Department of Radiology, University of Pennsylvania, Philadelphia, PA, USA

Conventional spoiled gradient echo imaging with quadratic RF spoiling generates non-ideal signal intensities, particularly at short repetition times and large flip angles. This translates to significant errors in various quantitative applications based on T1-weighted image contrast. This work proposes a novel spoiling scheme, based on random gradient moments and RF phases, in conjunction with the radial acquisition scheme to suppress artifacts caused by TR-to-TR signal variations. The proposed method achieves ideal spoiling within a wide range of flip angles (00-900) and repetition times (5-3000 ms). Simulations and phantom experiments demonstrate the superior performance over conventional RF spoiling.