Edwin Versteeg1, Dennis W.J. Klomp1, and Jeroen C.W. Siero1,2
1Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Spinoza centre for neuroimaging Amsterdam, Amsterdam, Netherlands
1Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Spinoza centre for neuroimaging Amsterdam, Amsterdam, Netherlands
Positioning of a silent gradient axis driven in synergy with the body gradients is prone to misalignment due to operator errors. Thismisalignment with the body-gradients can be estimated and corrected using a PSF based reconstruction, which significantly reduces ghosting artifacts.
Figure 3: Reconstruction
results without and with inclusion of the PSF-mapping (top row). Here, the
zoomed FOV is shown (112 x 112 mm2 to show more detail in the
phantom). The differences between the different reconstructions (bottom row).
Note that we can clearly see the large effect of the 0th order PSF
component on the ghosting. The horizontal lines in all images are caused by a
stimulated echo.
Figure 4: Reconstruction results for the 0th order correction on a large head
phantom. Due to the large phantom size, large B1+-inhomogeneities
are visible in the bottom of the phantom. In addition, some air bubble induced
susceptibility artifacts and signal pile-up due to field non-linearities are
visible in the bottom of the image
