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Comparison of dynamic CT and stable xenon CT in ischemic cerebrovascular disease
H Touho1, J Karasawa, H Ohnishi
1Department of Neurosurgery, Osaka Neurological Institute, Japan.
Insights
A new dynamic CT parameter, f, correlates positively with cerebral blood flow (CBF) in patients with ischemic cerebrovascular disease, aiding hemodynamic assessment.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Ischemic cerebrovascular disease impacts cerebral blood flow (CBF).
- Dynamic computed tomography (CT) offers potential for hemodynamic assessment.
- Accurate CBF measurement is crucial for evaluating cerebrovascular disease.
Observation:
- The study involved 23 patients with ischemic cerebrovascular disease, including acute and chronic stages.
- Cerebral blood flow (CBF) and hemodynamic parameters like area under the curve (A) and mean transit time (MTT) were measured using dynamic CT and stable xenon inhalation.
- A significant inverse correlation was observed between CBF and MTT.
Findings:
- A novel parameter, f (calculated as A/MTT), demonstrated a significant positive correlation with CBF.
- The derived formula relating MTT and CBF was MTT = 18.66 - 0.495.CBF + 0.005.CBF2 (r = .730, P < .001).
- This parameter 'f' is proposed to represent relative CBF.
Implications:
- The parameter 'f' shows promise for evaluating the hemodynamic status in patients with ischemic cerebrovascular disease.
- Dynamic CT-derived parameters can provide valuable insights into cerebral hemodynamics.
- This method may enhance the diagnostic capabilities for cerebrovascular conditions.
Purpose:
To investigate a new hemodynamic parameter that can be obtained by dynamic CT and that reflects cerebral blood flow (CBF), in patients with ischemic cerebrovascular disease.
Methods:
CBF and hemodynamic parameters including the area under the time-dependent contrast-medium dilution curve (A) and mean transit time (MTT) were measured in 23 patients with ischemic cerebrovascular disease. They included 17 patients in the chronic stage (more than 1 month after onset) and six with acute occlusion of the internal carotid or middle cerebral artery (within 24 hours of onset). CBF measurement was conducted by inhalation of stable xenon during CT scan and the hemodynamic study was performed using dynamic CT.
Results:
CBF in the territory of the middle cerebral artery had an inverse correlation with MTT. (A) divided by (MTT) defined as (f) had a significantly positive correlation with CBF (MTT = 18.66 - 0.495.CBF + 0.005.CBF2, r = .730, P < .001).
Conclusion:
This parameter (f) is thought to represent a relative CBF and it can be used in evaluation of the hemodynamic status in ischemic cerebrovascular disease.