Figure 4.
Similar as Figure 3, but upon zooming onto the olfactory bulb. In lieu of less informative sagittal images, we show two axial slices taken at different heights within the olfactory bulb. In this acquisition the read dimension corresponds to the red arrow direction, the 2nd (low bandwidth) SPEN dimension corresponds to the blue arrow direction, and the 3rd phase encoded dimension corresponds to the green arrow direction. SPEN's zoom-in ability is evidenced in the coronal slice, where it allows focusing on the olfactory bulb area without folding from the rest of the brain. Superimposed to these two axial slices are the images extracted from the Paxinos and Franklin mouse brain atlas (Franklin and Paxinos, 2008) at Bregma position of 3.56 and 4.28 mm for slices 1 and 2, respectively. The subtle horizontal stripes present in the axial FA images originate from minor phase disturbances between odd and even echoes and/or segments, limiting the self-referenced post-processing phase correction in the SPEN reconstruction. See Supplementary Information for 3D renderings of these data, and the main text for the meaning of the various layers in the atlas.