Currently, MRI is used not only for diagnosis but also for intraoperative surgical treatment. The surgeon determines the position of the disease region by comparing the MRI image and the patient's condition during the operation. Therefore, the predicted spatial position of the diseased part is based mainly on the surgeon's knowledge and experience, and surgeons do not fully utilize the information obtained from the MRI image. We have developed a prototype of a slice image overlay system, comprising an MRI-compatible display for open-type MRI systems and image registration and visualization software to acquire appropriate MRI slice images that are precisely correlated to the position of an MRI gantry. In this paper, we present the design of a fully MRI-compatible display device consisting of an optical fiber bundle, a lens system, and a half mirror, as well as the registration method used. We have achieved an image resolution of 1.0 mm/pixel. Phantom experiments have been performed to evaluate the MRI compatibility and image overlay accuracy of the device. Use of this device in the MRI gantry resulted in an S/N decay of 0.7% in the image and a target registration error of less than 1.2 ± 0.5 mm around the center of the display. It has been shown that the proposed system has adequate MRI compatibility and can function as a new vision system for open-type MRI systems and assist surgeons in minimally invasive surgeries.
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