Hybrid intravenous digital subtraction angiography of the carotid bifurcation.

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Abstract
A hybrid digital subtraction angiography technique and noise-reduction algorithm were used to evaluate the carotid bifurcation [in humans]. Temporal, hybrid and reduced-noise hybrid images were obtained in right and left anterior oblique projections, and both single- and multiple-frame images were created with each method. The resulting images were graded on a scale of 1 to 5 by 3 experienced neuroradiologists. Temporal images were preferred over hybrid images (average score = 3.2 and 2.4, respectively). The percentage of nondiagnostic examinations, as agreed upon by 2 readers, was higher for temporal alone than temporal + hybrid (4 and 1, respectively). In addition, also by agreement between 2 readers, temporal + hybrid images significantly increased the number of bifurcations seen in 2 views (87%), compared to temporal subtraction alone (64%). [Implications, are presented with respect to the use of this technique in the evaluation of cerebrovascular disorders.].

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