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Comparison of 7T MRA and DSA regarding the number of detected collateral networks and image quality for anastomoses to major trunk vessels and collateral pathways to cortical vessels
Type Connecting Vessels in Collateral Networks DSA TOF-MRA MPRAGE
Collateral networks connecting to cortical arteries 
    a Striate/choroidal arteries and medullary-cortical arteries 11 16 8
    b Striate/choroidal arteries and the pericallosal arteries 7 9 4
Total 18 25 12
Image quality (n = 18)^{^a} (mean) (SEM) (range) 4.0 (0.26, 3–5) 4.8 (0.10, 3–5) 2.4 (0.35, 1–5)
Collateral networks connecting to major trunk vessels 
    c Choroidal arteries or PcomA and thalamostriate arteries 21 19 9
    d Intrastriatal arteries 21 22 16
    e Intrathalamic arteries 8 8 6
    f Moyamoya vessels in the basal cistern 32 32 30
Total 82 81 61
Image quality (n = 82)^{^a} (mean) (SEM) (range) 4.6 (0.07, 2–5) 4.4 (0.12, 3–5) 2.7 (0.13, 1–5)
Note:—PcomA indicates posterior communicating artery.
↵a Image quality was evaluated in collateral networks detected by DSA as a clinical standard using a 5-point scale.