Tzu-Cheng Chao1, Jürgen Rahmer2, Sandeep Ganji3, Guruprasad Krishnamoorthy3, Peter Börnert2, and James G. Pipe1
1Department of Radiology, Mayo Clinic, Rochester, MN, United States, 2Philips Research, Hamburg, Germany, 3Philips Healthcare, Gainesville, FL, United States
1Department of Radiology, Mayo Clinic, Rochester, MN, United States, 2Philips Research, Hamburg, Germany, 3Philips Healthcare, Gainesville, FL, United States
An accurate estimation of gradient field is an important role in reconstructing spiral imaging. This study establish a model to estimate gradient field and its induced B0 variation for spiral imaging. The results show better geometry fidelity in the corrected spiral images.
Fig 3. The images reconstructed with the k-space coordinate and $$$B_0$$$ phases estimated from different methods are compared. Significant blurring can be found when using the predefined eddy current compensation model (red arrow), which can be mitigated substantially when more accurate k-space coordinates are applied in the other four cases. The inclusion of $$$B_0$$$ coupling improved the geometric consistency between the images by eliminating translation and distortion of the objects (yellow arrow).
Fig 1. One of the slew limited probing input is demonstrated with its corresponding measured current, $$$ gradient field $$$ and the $$$B_0$$$.
