What is the digital subtraction process used for in fluoroscopy?

The digital subtraction process in fluoroscopy is specifically used to create a mask image that is later subtracted from other images. This technique is crucial for enhancing visualization of the structures of interest by effectively removing background noise and overlying tissues.

During the procedure, an initial mask image is acquired when the anatomy is at its baseline state, often before the injection of contrast material. This mask captures all the features of the area being examined, without any added contrast. When the contrast agent is introduced, additional images are taken; these show the vascular structures highlighted by the contrast. By subtracting the mask image from the subsequent images, the vascular details can be emphasized, allowing for clearer assessment and diagnosis.

This process is particularly useful in vascular imaging and interventional procedures, as it provides a stark contrast between the enhanced vascular structures and the surrounding tissues, eliminating clutter and improving the diagnostic quality of the images. Other options do not accurately describe this process's primary objective or function in the context of fluoroscopy.