ABSTRACT
Objective To explore the effect of scanning time on CT perfusion (CTP) imaging quality and the accuracy of parameters in acute stroke patients.Methods CTP data of 30 patients with unilateral acute cerebral infarction were investigated retrospectively.CTP data with scanning times of 56 s,52 s,48 s,44 s,40 s and 36 s were analyzed for image postprocessing,the time density curves (TDCs) of the superior sagittal sinus (SSS),perfusion maps and the parameter values of ROI were obtained,and the first passage time of SSS was recorded.Results Compared with 56 s group,there was no significant difference of the image quality in the scanning time of 52 s group and 48 s group (both P＞0.05).The image quality was significantly negatively correlated with the first passage time of SSS in 52 s group,48 s group,44 s group,40 s group and 36 s group.Compared with 56 s group,there were significant differences in partial parameters of ROI when the scanning time was 44 s (all P＜0.05).Conclusion Decreasing whole-brain CTP scanning time reasonably can ensure the image quality and the accuracy of parameters and reduce the radiation dose.The whole-brain CTP with delay of 8 s,and scanning time of 48 s are recommended.
ABSTRACT
Objective To explore the effect of scanning time on CT perfusion (CTP) imaging quality and the accuracy of parameters in acute stroke patients.Methods CTP data of 30 patients with unilateral acute cerebral infarction were investigated retrospectively.CTP data with scanning times of 56 s,52 s,48 s,44 s,40 s and 36 s were analyzed for image postprocessing,the time density curves (TDCs) of the superior sagittal sinus (SSS),perfusion maps and the parameter values of ROI were obtained,and the first passage time of SSS was recorded.Results Compared with 56 s group,there was no significant difference of the image quality in the scanning time of 52 s group and 48 s group (both P＞0.05).The image quality was significantly negatively correlated with the first passage time of SSS in 52 s group,48 s group,44 s group,40 s group and 36 s group.Compared with 56 s group,there were significant differences in partial parameters of ROI when the scanning time was 44 s (all P＜0.05).Conclusion Decreasing whole-brain CTP scanning time reasonably can ensure the image quality and the accuracy of parameters and reduce the radiation dose.The whole-brain CTP with delay of 8 s,and scanning time of 48 s are recommended.