Figure 3.

During procedures performed under ultrasound (A), X-rays (B), or under computed tomography scan (C), the screens should be placed in front of the operator to allow a downward viewing angle of 10–15°, which improves the position of the operator’s cervical spine during the whole procedure. Ceiling-mounted monitors can be placed in a wide variety of positions while gathering all the information needed by the operator, including the electromagnetic navigation system, and reducing the congestion of space (D, arrow). Head and body movements used to navigate and search among the screens of all the systems required are therefore limited (to the right, as shown by the dashed line).