A dual-focus X-ray tube is described by which characteristics?

A dual-focus X-ray tube is characterized by having two filaments and two focal spot sizes. This design allows for greater flexibility in imaging, as the radiologic technologist can choose to use a smaller focal spot for higher-resolution images or a larger focal spot for imaging with higher power levels.

The two filaments facilitate this variable focal spot size: one filament typically produces a smaller focal spot, which is ideal for high-detail imaging, while the other filament provides a larger focal spot, useful for imaging thicker body parts or when higher radiation output is needed. This dual capability enhances the versatility of the X-ray tube in clinical practice, enabling it to accommodate a range of imaging needs and patient conditions more effectively.