肺結節の術中局在診断のためのポータブルコーンビームCTシステム：初期経験

Advances in imaging have expanded options for diagnosis and therapy, including wedge resection of small pulmonary nodules. Cone-beam computed tomography (CBCT) can substitute for hybrid operating rooms to identify impalpable nodules. We report the initial clinical use of a portable CBCT system (Cios Spin, Siemens, Germany) for intraoperative localization of small pulmonary nodules.

Four patients (three men, one woman; mean age, 68.3 years) with peripheral nodules were included. Under general anaesthesia, an initial pre-scan confirmed that the lesion was within the field of view. Thoracoscopic surgery was initiated, and a surgical clip was placed on the visceral pleura at the site predicted from preoperative computed tomography (CT) to be closest to the tumour. During surgery, the C-arm was removed and later repositioned for intraoperative scanning.

All nodules, 1.4-cm ground-glass, 2.0-cm part-solid, and two 0.7-cm, were clearly visualized, with image quality comparable to preoperative CT. The portable system accommodated table flexion and lateral decubitus positioning. No complications occurred, and radiation exposure, measured in one case, was acceptable.

To our knowledge, this is the first report to demonstrate that portable CBCT enables accurate, flexible, and real-time intraoperative localization of pulmonary nodules without requiring a hybrid operating room.