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. Author manuscript; available in PMC: 2015 Jul 1.
Published in final edited form as: Magn Reson Med. 2013 Sep 12;72(1):124–136. doi: 10.1002/mrm.24913

Figure 2.

Figure 2

PSF analysis for the limited readouts scenario: (a) Schematic for the limited-readout sampling scenario for Cartesian and radial acquisition with equal number of readouts and readout resolution; Panels (b)-(d) show PSFs with NRO=64 readouts and NS=256 samples per readout (fixed readout FOV [-L,L]); (b1,b2) absolute value of the Cartesian PSF and its 1D cuts along x and y; the FOV along PE is [-0.75L,0.75L]; Panels (c1,c2) and (d1,d2) show the radial PSF and its 1D cut corresponding to non-apodized reconstruction and apodized reconstruction (apodizer as in Eq. [3] using Ω = 1.17), respectively. In contrast to radial sampling, insufficient k-space coverage along ky (PE) in Cartesian sampling results in low frequency oscillations along y (3 times wider side lobes than x), as shown in (b1,b2).