Radial keyhole sequences for low field projection reconstruction interventional MRI

Interventional. magnetic resonance imaging (IMRI) is a rapidly emerging app lication for MRI in which diagnostic and therapeutic procedures are perform ed with AM Image guidance. Real-time or near-real-time image acquisition an d relative Insensitivity to motion are essential for most intraoperative, t herapeutic, and diagnostic procedures performed under MR guidance. The purp ose of this work was to demonstrate the development and utility of two alte rnative rapid acquisition strategies during IMRI that are analogous to comp uted tomography fluoroscopy or keyhole MRI in a radial rather than rectilin ear coordinate frame. The two strategies discussed here, interleaved projec tion reconstruction and continuous projection reconstruction, are compared and the feasibility of their application in experimental interventional app lications Is studied. (C) 2001 Wiley-Liss, Inc.