Radial Stack-of-Stars Abdominal MRI at 7 Tesla

Abdominal MRI at 7T is sensitive to transmit field inhomogeneities and motion-induced artifacts. Transmit inhomogeneities have previously been addressed using time-interleaved acquistion of modes (TIAMO), providing uniform flip angles across a large field-of-view in the body. Meanwhile, the radial stack-of-stars sequence has been shown to be well-suited for motion-corrected MRI. In this work, TIAMO and motion-corrected radial MRI were combined to create abdominal images of three volunteers at high spatial resolutions. Results showed homogeneous transmit fields in all volunteers with excellent image quality at very high resolution. However, low-resolution scans suffered from artifacts due to gradient non-linearities and residual motion.