• Nicolas Pitteloud, Axel Gamulin, Christophe Barea, Jerome Damet, Guillaume Racloz, and Marta Sans-Merce.
• Physics Section, University of Geneva, Geneva, Switzerland. Nicolas.Pitteloud@chuv.ch.
• Eur Spine J. 2017 Mar 1; 26 (3): 651-657.

PurposeThis study was conducted to characterise the O-arm® surgical imaging system in terms of patient organ doses and medical staff occupational exposure during three-dimensional thoracic spine and pelvic examinations.MethodsAn anthropomorphic phantom was used to evaluate absorbed organ doses during a three-dimensional thoracic spine scan and a three-dimensional pelvic scan with the O-arm®. Staff occupational exposure was evaluated by constructing an ambient dose cartography of the operating theatre during a three-dimensional pelvic scan as well as using an anthropomorphic phantom to simulate the O-arm® operator.ResultsPatient organ doses ranged from 30 ± 4 μGy to 20.0 ± 3.0 mGy and 4 ± 1 μGy to 6.7 ± 1.0 mGy for a three-dimensional thoracic spine and pelvic examination, respectively. For a single three-dimensional acquisition, the maximum ambient equivalent dose at 2 m from the iso-centre was 11 ± 1 μSv.ConclusionDoses delivered to the patient during a three-dimensional thoracic spine image acquisition were found to be significant with the O-arm®, but lower than those observed with a standard computed tomography examination. The detailed dose cartography allows for the optimisation of medical staff positioning within the operating theatre while imaging with the O-arm®.

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