Which of the following is NOT an image processing technique used in digital fluoroscopy?

Mosaic imaging is not typically considered a standard image processing technique used in digital fluoroscopy. Instead, it refers to a method of combining multiple images to create a larger or more comprehensive view, often used in different imaging contexts or modalities, rather than a direct enhancement or manipulation technique applied to single fluoroscopic images.

In contrast, temporal frame averaging involves taking multiple sequential images and averaging them to reduce noise and improve overall image clarity. This technique is particularly useful in digital fluoroscopy to enhance picture quality, especially in dynamic studies where motion is prevalent.

Edge enhancement is a commonly used technique in fluoroscopy that improves the visibility of structures by increasing the contrast at the borders of objects in an image. This can help in better delineation of anatomical features and pathology.

Last image hold is a useful feature in fluoroscopy that keeps the last acquired image on the screen while a snapshot view may be required, allowing for clearer observations without losing the context of the procedure. This method aids in maintaining visibility during prolonged interventions.