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MASK CONSTRUCTION FOR CARDIAC SUBTRACTION
专利权人:
发明人:
申请号:
EP09786837.6
公开号:
EP2320801B1
申请日:
2009.08.06
申请国别(地区):
EP
年份:
2016
代理人:
摘要:
To provide an improved method for achieving DSA images where the effect of residual motions in cardiac DSA during the perfusion phase is reduced and in order to display subtracted images containing less motion artefacts, a method of performing digital subtraction angiography DSA in an imaging apparatus comprises the steps of generating a first image sequence of mask images (10) of a subject to be examined, generating at least one first contrast image (22) at a first phase (16) whereby in the first contrast image part of the subject has a different contrast than in said first image sequence, subtracting the mask images (10) from the at least one first contrast image (22) generating a first DSA image sequence (24), subtracting the DSA images of the first DSA image sequence (24) from the first contrast image (22) within the first phase (16) generating a sequence of extended mask images (32) generating a second contrast image (34) with the imaging system at a second phase (18), said second phase (18) being separated from the first phase (16) by a predetermined phase dividing time limit (20), subtracting the images of the sequence of the extended mask images (32) from the second contrast image (34) generating a second DSA image sequence (38), displaying the second DSA image sequence (38) on a display (28).
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