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Table 2: 
Technical parameters for different DSA examinations; protocol 1: diagnostic angiography of cerebral vessels^a
Vessels RICA Head RICA Head RICA Head RICA Head RVA Head LICA Head LVA Head
Projections for DSA runs AP/LAT biplane Oblique monoplane Oblique monoplane 3D RA AP /LAT biplane AP/LAT biplane AP/LAT biplane
fps:duration 2 fps:4 s 2 fps:4 s 2 fps:4 s 25 fps:4 s 2 fps:4 s 2 fps:4 s 2 fps:4 s
1 fps:5 s 1 fps: 2 s 1 fps:2 s 1 fps:5 s 1 fps:5 s 1 fps:5 s
No. of frames 26 10 10 100 26 26 26
FOV (cm) 22/23 17 17 17 22/23 22/23 22/23
SID 102/99 102 103 119 104/99 106/100 102/101
kV(p) (AP/LAT) 80/75 85/– 82/– 92/– 80/75 80/75 80/75
mAs per f (AP/LAT) 91/25 102/– 101/– 1.1/– 114/28 97/25 92/27

Note:—RICA indicates right internal carotid artery; LICA, left internal carotid artery; RVA, right internal vertebral artery; LVA, left internal vertebral artery; 3D RA, 3D rotational angiography; AP, anterior posterior direction; LAT, lateral direction; fps, frames per second; SID, source to image distance (cm); mAs, tube current time product; Al, aluminum, HVL, half-value layer; Cu, copper.

 
↵a AEC was used. Filtration was 2.9 mm Al HVL and 0.1 mm Cu. The total number of frames was 224 in protocol 1 and 275 in protocol 2. The fluoroscopy time was 5 minutes in both protocols.