"Be nice to your gradients!" Useful gradient modifications for SPI

Single Point Imaging (SPI) is a pure phase encoding sequence and it requires long scan times and it has high level gradients which are active during RF excitation. In this work, a novel k-space ordering scheme is proposed which results in less heating of gradient coils. Additionally, the sequence is modified such as the gradient levels are limited during RF excitation which provides a smoother excitation profile while preserving the low acoustic noise levels. The idea of limiting gradient amplitudes during RF excitation can be applied to other projection reconstruction sequences.

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