
doi: 10.1148/113.2.470b
pmid: 4608869
The authors describe a new technique of second-order subtraction in which the degree of contrast is built up, separating vessels from the surrounding structures more clearly because the correction film is completely lucent over the vessels.
Subtraction Technique, Angiography, Humans, Vertebral Artery
Subtraction Technique, Angiography, Humans, Vertebral Artery
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