経頭蓋カラードプラ診断法 (TC-CFI) における中大脳動脈血流速度の機種間差の検討 第1報

抄録

There have been few reports regarding the normal velocities in transcranial color flow imaging. In addition, little is known about the reproducibility of middle cerebral artery (MCA) velocity values with different types of US machines. The MCA velocities were measured in 80 healthy Japanese subjects (males 44, females 36) using the Aloka SSD 5500 and Toshiba SSA 270A. The peak systolic velocities (PSV), end diastolic velocities (EDV), mean velocities (MV) and asymmetry index (AI) of the bilateral MCA were measured. The insonation rates of the MCA were approximately the same (about 90%) with the two machines, but the PSV and EDV of the males, and the EDV of the females were not the same. The velocities with the Aloka SSD 5500 were typically more rapid than those with the Toshiba SSA 270A (P <0.05-0.001) . Rapid progress is being made in the improvement of US machines. Even if the MCA pulse wave is very weak, up-to-date US machines with a digital system can detect it very accurately. When transcranial color flow imaging (TC-CFI) is performed, the normal range of the velocities in the intracranial blood vessels should be established with individual US machines. As there were no differences in the MV and AT of the MCA with the two types of machine used in this study, the MV and AT are considered to be useful parameters in TC-CFI.