Which method is commonly used to enhance the contrast in digital fluoroscopy?

Temporal subtraction is a technique used in digital fluoroscopy to enhance image contrast. This method involves the sequential acquisition of two images over time; one acquired during a sequence where there is no contrast agent present and the other acquired after the contrast agent has been administered. By subtracting the first image from the second, the structures that remain constant (such as bones or background) are removed from the final image, leaving a clearer depiction of the areas where the contrast agent has accumulated. This results in enhanced visualization of blood vessels or soft tissues, making it easier to identify abnormalities or lesions.

While the other techniques like image augmentation, edge enhancement, and digital filtering are also useful in image processing, they serve different purposes and may not specifically relate to the improvement of contrast in the same way temporal subtraction does. Image augmentation generally refers to methods of artificially expanding the datasets to improve model training, edge enhancement focuses on highlighting the edges of structures in an image, and digital filtering is used to reduce noise or improve signal quality. Therefore, temporal subtraction is specifically aligned with enhancing contrast in digital fluoroscopy.