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Compressed sensing has shown great potential in reducing data acquisitiontime in magnetic resonance imaging (MRI). Recently, a spread spectrumcompressed sensing MRI method modulates an image with a quadratic phase. Itperforms better than the conventional compressed sensing MRI with variabledensity sampling, since the coherence between the sensing and sparsity basesare reduced. However, spread spectrum in that method is implemented via a shimcoil which limits its modulation intensity and is not convenient to operate. Inthis letter, we propose to apply chirp (linear frequency-swept) radio frequencypulses to easily control the spread spectrum. To accelerate the imagereconstruction, an alternating direction algorithm is modified by exploitingthe complex orthogonality of the quadratic phase encoding. Reconstruction onthe acquired data demonstrates that more image features are preserved using theproposed approach than those of conventional CS-MRI.

Spread spectrum compressed sensing MRI using chirp radio frequency pulses