STROKE: IMAGING

1
STROKE IMAGING

• STROKE IMAGING STATISTICS
• NON-HAEMORRHAGIC STROKE
• 1. DIFFUSION WEIGHTED IMAGING (DWI)
• Sensitivity -90
• Specificity -95
• Accuracy -90
• Positive Predictive Value -100
• Negative Predictive Value -50
• 2. CT SCANNING (UNCONTRASTED)
• Sensitivity 60
• Specificity 65
• Accuracy 60
• Positive Predictive Value 95
• Negative Predictive Value 10

2
HAEMORRHAGIC STROKE 1. MRI Sensitivity
100 Specificity 100 Please note that care
should be taken for the possibility for
subarachnoid haemorrhage (SAH) which may be very
difficult to see on MRI Scanning. 2. CT
SCANNING Sensitivity 100 Specificity
100 Please note that abovementioned statistics
apply to the hyperacute and acute stages of
haemorrhagic stroke. Subacute may be isodense
on CT. Chronic micro bleeds are definitely better
seen on MRI Scanning compared to CT Scanning.