The ultrashort echo time (UTE) sequence is capable to provide information about tissues with short T2. On the other hand, as with all non-Cartesian data sampling schemes in general, it is sensitive to mismatching in the acquisition trajectory. This can be a potential source of errors, especially when used for quantitative applications such as proton density (PD) mapping. This problem can be reduced by calibration and correction of the k-space acquisition trajectories. The presented experiments demonstrate the importance of sampling trajectory corrections for UTE imaging, especially when applied for quantitative measurements.