title: Enhanced video image guidance for biopsy using the safety map.
abstract: We present the system design and the methods of video-based guidance to assist with brain tumor biopsy procedures. The system comprises of a three-dimensional (3-D) position sensor, a CCD camera, a liquid crystal display (LCD) and a graphics computer equipped with a video capture board. The markers for positional measurement are attached to the CCD camera, a surgical tool, and the patient head. In order to be integrated into the camera-viewing capacity, 3-D images of the head and guidance indicators are visualized to form a life like video image. For reliable guidance, we also use the surgical plan, called the "safety map", which is a sphere surface highlighting the covering area of anatomically significant tissues and obstacles around the target for the indication of the biopsy needle's insertion starting-point. The safety map can be visualized in exactly the same way as it would be in a real life situation. The preliminary experiments were performed at the National Cancer Center. A high degree of flexibility in terms of views was created by using general apparatuses which are a CCD camera and a LCD. The display of the safety map enabled a successful completion of both craniotomy and biopsy needle insertion procedures.
authors.affiliation: Mitsubishi Electric Corp. Information Technology R&D Center, Kanagawa, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nakajima
authors.forename: H
authors.initials: H
authors.lastname: Oyama
authors.forename: A
authors.initials: A
authors.lastname: Sawada
authors.forename: K
authors.initials: K
authors.lastname: Muroi
mesh_terms: D001707:Biopsy, Needle / Q000295:instrumentation*; D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D019047:Phantoms, Imaging; D012449:Safety; D013238:Stereotaxic Techniques / Q000295:instrumentation*; D014584:User-Computer Interface