Correcting K-Trajectory by using Multiple Function Models of Gradient Waveform for Ultrashort TE(UTE)

Masahiro Takizawa¹, Hikaru Hanada¹, Kuniharu Oka¹, Tetsuhiko Takahashi¹

The UTE sequence, based on radial sampling, acquires echo signal from central to outer parts of k-space. For this kind of sequence, K-trajectory error caused by gradient system response becomes a major problem. For clinical use of UTE it is important to be able to change imaging conditions and parameters for a general oblique imaging plane without causing K-trajectory errors. Even if there are errors on the gradient output, the K-trajectory can be estimated by calculating the error strictly. In this study, the multiple function models are used for correcting the total error of the gradient system response.