Abstract
A helical computed tomography (CT) has been introduced in our operating room for intraoperative CT. We examined several points of anesthetic management during intraoper-ative CT. Measurements of a scatter dose were made in a CT room. The scatter dose was 5.6μSv/lscan at 1.5m from the phantom, and maximum scatter doses were noted at scatter-ing angles between 45° and 135°. A lead gown and a protective screen reduced the radiation dose to 13.4% and 1.6%, respectively. On simulation of anesthetic management for intra-cranial surgery, a radiation screen reduced the radiation dose to 8%. Simulation of every surgical position was performed, and the arrangements of apparatus in a CT room (i.e. a surgical bed, an anesthetic apparatus, etc.) were decided. Moreover, the respiratory circuit was changed to an elastic and flexible circuit (RX Circuit, Intertec Resources Inc.).Measurements of a scatter dose and simulation of intraoperative CT were useful for preparation of a manual, and consequently they have made it possible for us to carry out intraoperative CT rapidly, smoothly and safely.
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