No. of Cases with Superimposed Bone in Standard CTAb | Presence of Superimposed Bone in CTPa | No. of Cases with Superimposed Veins in Standard CTAc | Presence of Superimposed Veins in CTPa | |||
---|---|---|---|---|---|---|
Av Obs 1 | Av Obs 2 | Av Obs 1 | Av Obs 2 | |||
Proximal area | ||||||
ACA territory | 12 | 5 % | 5 % | 18 | 4 % | 4 % |
MCAd territories | 4 | 5 % | 3 % | 23 | 6 % | 11 % |
PCA territory | 23 | 3 % | 3 % | 24 | 4 % | 9 % |
More peripheral area | ||||||
ACA territory | 2 | 3 % | 3 % | 22 | 5 % | 16 % |
MCAd territories | 8 | 5 % | 2 % | 24 | 7 % | 20 % |
PCA territory | 0 | – | – | 24 | 5 % | 20 % |
Note:—Av indicates average; Obs, observer.
↵a A 0% score indicates no presence of superimposed bone and veins in CTPa compared with the full presence in standard CTA.
↵b Number of cases (of 24) in which bony structures hampered evaluation of arteries within the specific territory on standard CTA.
↵c Number of cases (of 24) in which veins hampered evaluation of arteries within the specific territory on standard CTA.
↵d Average over left and right sides.