The objective of this study was to provide the characteristics of hepatic computed tomography images and optimize their transition delay with a bolus-tracking technique for triple-phase hepatic computed tomography in ...The objective of this study was to provide the characteristics of hepatic computed tomography images and optimize their transition delay with a bolus-tracking technique for triple-phase hepatic computed tomography in cats.Dynamic triple-phase computed tomography was performed in nine healthy cats.The upper third of the liver was dynamically scanned every 0.5 s for 40 s.The time density curves of the aorta and hepatic parenchyma mean enhancement were analyzed.Triple-phase hepatic computed tomography was performed three times with a bolus trigger of 200 Hounsfield units of aortic enhancement.The transition delays of the arterial,portal,and hepatic parenchymal phases were respectively 0,5 and 60 s in the first scan;2,7 and 62 s in the second scan;and 4,9 and 64 s in the third scan.All computed tomography images were evaluated by a certificated radiologist.The arterial vessels and their main branches were well enhanced at a 2 s transition delay.The contrast of the portal vein to the liver parenchyma was most obvious at a 7 s transition delay.The mean enhancement of the hepatic parenchyma peaked at a 62 s transition delay,whereas the degree of enhancement of the hepatic vasculature decreased.In this study,the recommended transition delays for the arterial,portal,and hepatic parenchymal phases were 2 s,7 s and 62 s,respectively,after triggering at 200 Hounsfield units of aortic enhancement.This information may be helpful in diagnosing feline liver diseases and provides a key reference for the clinical implementation of CT.展开更多
基金This study was supported by the National Natural Science Foundation of China(Nos:31802255,31972756 and 32072938).
文摘The objective of this study was to provide the characteristics of hepatic computed tomography images and optimize their transition delay with a bolus-tracking technique for triple-phase hepatic computed tomography in cats.Dynamic triple-phase computed tomography was performed in nine healthy cats.The upper third of the liver was dynamically scanned every 0.5 s for 40 s.The time density curves of the aorta and hepatic parenchyma mean enhancement were analyzed.Triple-phase hepatic computed tomography was performed three times with a bolus trigger of 200 Hounsfield units of aortic enhancement.The transition delays of the arterial,portal,and hepatic parenchymal phases were respectively 0,5 and 60 s in the first scan;2,7 and 62 s in the second scan;and 4,9 and 64 s in the third scan.All computed tomography images were evaluated by a certificated radiologist.The arterial vessels and their main branches were well enhanced at a 2 s transition delay.The contrast of the portal vein to the liver parenchyma was most obvious at a 7 s transition delay.The mean enhancement of the hepatic parenchyma peaked at a 62 s transition delay,whereas the degree of enhancement of the hepatic vasculature decreased.In this study,the recommended transition delays for the arterial,portal,and hepatic parenchymal phases were 2 s,7 s and 62 s,respectively,after triggering at 200 Hounsfield units of aortic enhancement.This information may be helpful in diagnosing feline liver diseases and provides a key reference for the clinical implementation of CT.
