Biplane digital subtraction angiography.

Biplane digital subtraction angiography was performed by placing a rapid switch between the anteroposterior and lateral T.V. cameras and the A-D converter. Alternate exposures from two X-ray tubes were employed. Excellent anteroposterior and lateral DSA was obtained especially for the brain and neck. Although there was more time required for positioning, biplane imaging saved the second or the third injection in many occasions. The technique has been especially valuable for intravenous DSA of the brain and the neck.