Value of 4D CT Angiography Combined with Whole Brain CT Perfusion Imaging Feature Analysis under Deep Learning in Imaging Examination of Acute Ischemic Stroke
Table 1
CTP findings before cerebral infarction.
Stage
CTP manifestations
Microcirculation state
Cerebral blood flow status
I1
All parameters were normal
Well-established local collateral circulation in the brain
No drop in CBF
I2
Prolonged TTP and normal MTTCBF and CBV
Uncompensated dilation of microvessels in the brain
CBF above electrical failure threshold
I3
Prolonged TTP and MTT, normal/slightly decreased CBF, and elevated CBV
Compensatory dilation of microvessels in the brain
CBF above electrical failure threshold
II1
Prolonged TTP and MTT, decreased CBF, and normal/slightly decreased CBV
Mild stenosis of local microvascular compression in the brain
CBF between electrical failure threshold and membrane failure
II2
Prolonged TTP and MTT and decreased CBF and CBV
The microvessels in the brain were obviously compressed and narrowed
CBF between electrical failure threshold and membrane failure