Gradient-modulated PETRA

We introduce a novel PETRA technique with gradient modulation (GM) which enables higher readout bandwidth while keeping the missing center k-space region small. GM enables use of higher readout bandwidth while keeping excitation bandwidth relatively low, which reduces off-resonance blurring in images. The proposed sequence was evaluated by comparing PETRA techniques with and without GM for an equine knee sample in a human 7T scanner. GM-PETRA showed significantly less off-resonance blurring compared to the conventional PETRA technique under the same excitation bandwidth condition. GM can improve the PETRA image quality without any special hardware modification of clinical scanners.

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