Digital subtraction angiography (DSA) is an important technology in both medical diagnoses and interposal therapy,
which can eliminate the interferential background and give prominence to blood vessels by computer processing. After
contrast material is injected into an artery or vein, a physician produces fluoroscopic images. Using these digitized
images, a computer subtracts the image made with contrast material from a series of post injection images made without
background information. By analyzing the characteristics of DSA medical images, this paper provides a solution of
image fusion which is in allusion to the application of DSA subtraction. We fuse the images of angiogram and
subtraction, in order to obtain the new image which has more data information. The image that fused by wavelet
transform can display the blood vessels and background information clearly, and medical experts gave high score on the
effect of it.
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