MR Motion Fingerprinting

This work proposes a new framework, called MR motion fingerprinting, for fast real-time 3D MRI with an imaging latency<500ms. MR motion fingerprinting has two stages of imaging. The first stage, called the off-view mode, acquires and reconstructs a 4D motion database consisting of hundreds of real-time 3D images and associated 2D motion fingerprints. The second step, called the live-view mode, only acquires 2D motion fingerprints, which are used to search for matched 3D images from the motion database. This new approach enables efficient, accurate and robust real-time imaging with ultralow latency, which could be used for adaptive radiotherapy on MRI-Linac.