Radiology, Vol 152, 725-729, Copyright © 1984 by Radiological Society of North America
Hybrid intravenous digital subtraction angiography of the carotid bifurcation
FH Burbank, D Enzmann, GS Keyes and WR Brody
A hybrid digital subtraction angiography technique and noise-reduction
algorithm were used to evaluate the carotid bifurcation. 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 three 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 two readers,
was higher for temporal alone than temporal + hybrid (4 and 1,
respectively). In addition, also by agreement between two readers, temporal
+ hybrid images significantly increased the number of bifurcations seen in
two views (87%) compared to temporal subtraction alone (64%).
