Fig 4.

(a) Mean normalized mean squared error (NMSE) and (b) quantitative normalized vessel sharpness measures for all reconstructions of rates 2 to 5. Error bars represent standard deviation across subjects. sRAKI outperforms SPIRiT and l₁-SPIRiT at all rates for both metrics. The improvements in NMSE are statistically significant at all rates over both SPIRiT and l₁-SPIRiT, whereas the improvements in vessel sharpness with sRAKI are significant at rates 2 and 3 over SPIRiT, and rates 3–5 over l₁-SPIRiT. Red lines mark significant differences in the graphs.