Define Digital Radiography (DR).

Digital Radiography (DR) is defined as a method of capturing radiographic images using digital sensors instead of traditional film. This technology allows for rapid acquisition and processing of images, significantly improving workflow in clinical settings. With digital sensors, images are produced as electronic data, which can be easily stored, retrieved, and manipulated. This approach enhances image quality and enables advanced image analysis, making it a powerful tool in diagnostic radiology.

The other options describe different concepts that do not pertain to DR. Traditional film (as mentioned in the first option) refers to older methods of capturing images that involve chemical processing, which has largely been supplanted by digital techniques. The second option regarding X-ray therapy for tumors deals with treatment modalities rather than imaging techniques, while the fourth option refers to heart monitoring techniques, which do not relate to radiographic imaging at all. Thus, the defining characteristic of DR is its reliance on digital sensors, setting it apart from other methodologies.