2023 Volume 8 Issue 2 Pages 49-54
Objective: CT perfusion image (CTP) scans to quantitatively evaluate cerebral blood flow is a useful procedure because of its convenience and rapidity. However, CTP has a disadvantage of increased irradiative exposure several times. We usually conduct CTP scans according to a protocol of maker recommendation. Therefore, we examined retrospectively whether the reduction in scan times could lead to the reduction in exposure keeping the radiological findings.
Methods: CTP scans were performed for patients with cerebral infarction. The data obtained from CTP according to a protocol of maker recommendation (early phase 16 scans+delayed phase 4 scans) were compared to the CTP data thinning out scan times (early phase 8 scans). Using Bayesian inference, both data were analyzed by visual and quantitative evaluations.
As for the visual evaluation, these data were evaluated by 4 doctors by using the paired comparison method. As for the quantitative evaluation, each parameter was analyzed from the installed ROI value between the affected and non-affected cerebral cortex.
Results: As for visual evaluation, no significant differences in all parameters were found between the two groups. In the quantitative evaluation also, there was no significant differences.
Conclusion: The reduction in scan times in the CTP imaging did not affect the quality of data obtained from CTP, with decreasing exposure dose.
