From: A comparative study of perfusion CT and 99mTc-HMPAO SPECT measurement to assess cerebrovascular reserve capacity in patients with internal carotid artery occlusion
Impaired CVR in SPECT
Preserved CVR in SPECT
-Unilateral ICA occlusion
1 - Unilateral ICA occlusion, 3
-Moyamoya disease
1 - Moyamoya disease 3
-Bilateral ICA occlusion *
3 - Bilateral ICA occlusion * 1
-ICA/MCA occlusion
1 - ICA/MCA occlusion -