Optimal PSNR values for CS reconstructions for each sampling geometry for both ON and OFF images. The optimal reconstructions are represented by the ‘o’ symbol. For comparison, the ‘+’ symbol represents the PSNR achieved by simply zero-filling the missing k-space samples. The plots are also partitioned in to PSNR values that demonstrated excellent reconstruction (PSNR > 40 dB), adequate reconstruction (PSNR < 40 dB, but > 30 dB) and inadequate reconstruction (PSNR < 30 dB). (a) The results of sampling k-space with the DPE geometry class. (b) The results of the RPE geometry class. (c) The results of the RSP geometry class. (d) The results of the SLP geometry class.