Sinogram-based coil selection for streak artifact reduction in undersampled radial real-time magnetic resonance imaging

Streak artifacts are a common problem in undersampled radial magnetic resonance imaging (MRI) (1). While even moderate undersampling can compromise image quality, the experimental settings for real-time MRI (2) exacerbate this problem. This is mainly because the degree of undersampling necessary for significantly reducing the acquisition time invariably emphasizes streak artifacts in the resulting images. Although most of these problems may effectively be mitigated by temporal regularization during nonlinear inverse (NLINV) reconstruction (2) or ameliorated by temporal median filtering afterwards, remaining artifacts arise from signal disturbances caused by magnetic field inhomogeneities or gradient nonlinearities or originate from off-resonance contributions of the object itself, e.g., due to pronounced fat signals or tissue susceptibility differences