论文部分内容阅读
用MIRD法及自编软件计算了~(99m)Tc-TBI和~(201)Tl的内照射辐射吸收剂量。~(201)Tl的吸收剂量与文献值相似。二者共同的临界器官是肾和胰,~(99m)Tc-TBI还有肝脏。3.7×10~7Bq ~(99m)Tc-TBI的吸收剂量仅为~(201)Tl的1/10左右,因此~(99m)Tc-TBI一次心肌显像用量可达3.7×10~3Bq甚至更高。这样高的活度能大大增加信息量,不仅可以增进心肌平面或断层影像的质量,而且可以满足多门电路心脏室壁运动显像的要求。这是~(99m)Tc-TBI的突出优点,尽管它在有些方面存在着不如~(201)Tl之处。
The internal radiation dose of ~ (99m) Tc-TBI and ~ (201) Tl were calculated by MIRD and self-designed software. ~ (201) Tl absorbed dose and literature values similar. The common borderline organs are kidney and pancreas, ~ (99m) Tc-TBI and liver. The absorption dose of 3.7 × 10 ~ 7Bq ~ (99m) Tc-TBI is only about 1/10 of ~ (201) Tl, so the myocardial imaging dose of ~ (99m) Tc-TBI can reach as high as 3.7 × 10 ~ 3Bq high. Such a high activity can greatly increase the amount of information, not only can improve the quality of myocardial planar or tomographic images, and can meet the multi-door cardiac wall motion imaging requirements. This is a salient advantage of ~ (99m) Tc-TBI, although it is somewhat inferior to ~ (201) Tl in some respects.