What equipment feature is characteristic of a central DXA device?

The characteristic feature of a central DXA (dual-energy X-ray absorptiometry) device is the C-arm that hangs overhead. This design allows for precise positioning of the X-ray source and detectors, enhancing the accuracy and reliability of the bone density measurements collected. Central DXA devices are typically used in clinical settings and are designed with the C-arm configuration to enable comprehensive scanning of various skeletal sites, such as the spine and hip, which are critical for assessing bone health.

Other options do not accurately represent the primary features of a central DXA system. For instance, a movable table is generally found in some portable or peripheral DXA systems rather than central ones. Handheld scanning devices are more indicative of peripheral DXA, which targets specific areas and is used for quick assessments. A curved examination surface may be seen in some diagnostic imaging equipment but is not a typical characteristic associated with central DXA systems, which prioritize stability and precision in their scans.