Patent ID: 8498463

Claim:
A method of performing digital subtraction angiography DSA in an imaging apparatus, comprising the steps of: generating a first image sequence of mask images of a subject to be examined, generating at least one first contrast image at a first contrast phase whereby in the first contrast image a part of the subject has a different contrast than in said first image sequence, subtracting the mask images from the at least one first contrast image generating a first DSA image sequence, subtracting the DSA images of the first DSA image sequence from the first contrast image within the first phase generating a sequence of extended mask images, generating a second contrast image at a second contrast phase, said second phase being separated from the first phase by a predetermined phase dividing time limit, subtracting the images of the sequence of the extended mask images from the second contrast image generating a second DSA image sequence, and displaying the DSA images of the second DSA image sequence on a display.