What image processing technique enhances the visibility of blood vessels in angiography?

The technique that enhances the visibility of blood vessels in angiography is road mapping digital subtraction angiography (DSA). This technique involves acquiring a series of images before and after the injection of a contrast agent. The initial series, known as the mask image, captures the anatomy without contrast, while subsequent images show the contrast-enhanced blood vessels.

By subtracting the mask image from the contrast images, road mapping DSA effectively removes the background structures, allowing for a clearer view of the blood vessels. This enhances the diagnostic quality of the images and provides a dynamic roadmap of the vascular anatomy, which is particularly valuable during interventional procedures.

The other techniques, while valuable in their respective contexts, do not provide the same level of enhancement specific to blood vessels as road mapping DSA. Radiopacity relates to the density of materials in imaging and doesn't specifically target vessel visibility. K-edge imaging focuses on dual-energy contrast agents but not specifically on enhancing blood vessel visibility. Temporal subtraction utilizes the time difference between images to remove stationary anatomical structures, which may not enhance the clarity of blood vessels as effectively as road mapping DSA.