1. Fig 3. Biplanar system is shown.
Fig 3. Biplanar system is shown. A, Siemens Magnetom Open Viva system located in the operating room complex at University Hospitals of Cleveland. With head in imaging position, side access is possible, but the upper magnet pole blocks direct vertical access. Head fixation during surgery is provided with a prototype coil developed by the Heidelberg Neurosurgical Group (arrowhead). Concentric markings on the floor signify 20-mT (200-gauss), 0.5-mT (5- gauss), and 0.15-mT (1.5-gauss) field lines. Anesthesia gas columns, telephone, computer connections, and surgical lighting and ventilation meet same requirements as adjacent standard surgical suites.B, As a variation on the “neighboring work-space” concept, the head end of the table can be smoothly rotated 120° from the magnet bore on a fixed base for surgical procedures, placing the surgical field (arrowhead) beyond the 5-gauss line. In this rotated operating position, the table can be tilted or raised to allow standard surgical positioning of the patient, and access for the surgeons and anesthesiologist is identical to a standard surgical suite. Because the surgical field is at less than 5-gauss field strength, standard surgical instruments, a standard Zeiss neurosurgical microscope (arrows), as well as standard ultrasonic suction-aspirator, electrocautery, and cortical stimulation equipment can be used. Retractors, curettes, and other equipment used in the magnet bore during image acquisition for monitoring or guidance must be MR-compatible.
Jonathan S. Lewin AJNR Am J Neuroradiol 1999;20:
©1999 by American Society of Neuroradiology