论文部分内容阅读
放射性核素首次通过心血管造影术广泛作为一种非创伤性手段以评价心功能。虽然~(99m)Tc常用,但它的半衰期较长,对于首次通过检查并不理想。不能在短期内重复使用。即使是用~(99m)Tc-DTPA亦需30～60分钟本底减低后方可进行。因此,难以在运动试验或用药时应用。近年来不断有报道述及~(195m)Hg-~(195m)Au发生器的应用。~(195m)Hg为回旋加速器生产的一种放射性核素,物理半衰期41.6小时。46%的~(195m)Hg衰变为~(195m)Au,物理半衰期30.6秒,γ射线能量262KeY。54%的~(195)Hg衰变为~(195)Hg,物理半衰期9.9小时。~(195m)Au及~(195)Hg均衰变为~(195)Au,半衰期183天,应用~(195m)Au之前必需将~(195)Au洗去。作者用~(195m)Au对33例(13例正常志愿者,20例
For the first time, radionuclides have been used as a non-invasive measure of cardiovascular function by cardiovascular angiography. Although ~ (99m) Tc is commonly used, its long half-life is not ideal for first-pass tests. Can not be reused in a short period of time. Even with ~ (99m) Tc-DTPA also need 30 to 60 minutes background reduction before. Therefore, it is difficult to exercise test or medication application. In recent years, there are reports about the application of ~ (195m) Hg- ~ (195m) Au generator. ~ (195m) Hg is a radionuclide produced by a cyclotron with a physical half-life of 41.6 hours. 46% of ~ 195 m Hg decays to ~ 195 m Au, has a physical half-life of 30.6 seconds and gamma-ray energy of 262 KeV. 54% of 195 Hg decays to 195 Hg and the physical half-life is 9.9 hours. ~ (195m) Au and ~ (195) Hg all decayed to ~ (195) Au with a half-life of 183 days. ~ 195 Au was washed away before ~ 195m Au was needed. The author used ~ (195m) Au 33 cases (13 normal volunteers, 20 cases