CT値を用いた頭蓋内血腫における経過時間の判断に関する検討

抄録

We measured the time-dependent change of computed tomography (CT) values for a blood sample in a syringe during 20 days expecting that the (average, maximum) CT values may be used to estimate the elapsed time after hemorrhage. The average CT value (CT_ave) rapidly increased for the first 50 min. The maximum CT value (CT_max) increased step by step to take the largest value (82.4 HU) one day later, and subsequently the CT_max decreased slowly to become 72.0 HU 20 days later. We conclude that the rapid increase of the CT_ave at the beginning is due to the fibrin generation, the increase of the CT_max is a result of the formation of the fibrin net, and the subsequent decrease of CT_max is caused by fibrinolysis. Tentative experimental formula for the time-dependent CT_max change at each increasing stage and decreasing stage are given to estimate the elapsed time after hemorrhage.