2D Multi-Spectral Imaging For Fast MRI Near Metal
This approach offers a fast (tens of seconds per slice) approach to MRI near metal while correcting much of the signal loss, distortion and abnormally bright signal that can occur near implanted metal.
While many passive implanted metal devices are safe for MRI scanning, they cause severe magnetic field variations that cause artifacts. Reversing the sign of the slice selection gradient in common spin-echo methods can enable selective excitation of both limited slice and limited frequency range. This allows separate imaging of the wide range of signal frequency bands that would otherwise result in distortion and other artifacts. The signal for a slice is built up by different frequency bands, which are combined to form a final image.
Hargreaves BA, Taviani V, Litwiller DV, Yoon D. 2D multi-spectral imaging for fast MRI near metal. Magn Reson Med. 2017 Apr 25. doi: 10.1002/mrm.26724.
Valentina Taviani is an alumnus of the BMR group