Real‐time organ motion tracking and fast image registration system for MRI‐guided surgery

Abstract

SUMMARYThe advantage of magnetic resonance imaging (MRI)-guided surgery, in which MR images taken during surgery are used to guide the surgery, has been recognized recently. However, there is a problem, due to long imaging time of MRI, that it is difficult to capture the respiratory organ motion. It is often a constraint that the patient must hold his or her breath, especially in the treatment of the abdominal region. Consequently, this paper proposes a method of eliminating this constraint in MRI-guided surgery by real-time monitoring of the movement of the organ involved in the surgery by means of the signal derived from MRI. Specifically, the navigator echo is extracted in imaging during surgery. The movement of the organ involved in surgery is detected on the basis of the change in the calculated projection profile, and the results are presented to the surgeon. In this study, the procedure is built into a 1.5-T clinical MRI system. The feasibility of the proposed system was examined under clinical conditions by evaluating its accuracy and delay in a phantom experiment, and also in an in vivo experiment on the liver of a volunteer. The results are reported in this paper.

Vessel target location estimation during the TIPS procedure

“…A number of groups have evaluated displacement of the healthy liver with respiration, concluding that the liver moves approximately 10–15 mm during the respiratory cycle (Clifford et al, 2002; King et al, 2001; Tokuda et al, 2006). Motion is predominantly in the rostro-caudal (head to foot) direction, but movement of several millimeters occurs along the other two axes as well (Venkatraman et al, 2004).…”