自1923年起碘化油被利用于脊髓腔造影剂以来,到現在还繼續在临床应用着,但是它有兩点美中不足,即:(1)碘化油很难依照攝影者需要随心所欲地移动;(2)使用后吸引除去比較困难。为了克服这个缺点,需要适当地降低它的粘度,故在国外多用某些高級脂肪酸乙酯的碘代物,如:二碘代二十一酸乙酯(C_(21)H_(41)I_2CO_2C_2H_5),对碘代苯基十一酸乙酯 Since 1923, iodized oil has been used clinically since it was used in spinal cavity contrast media. However, it has two disadvantages, namely: (1) iodized oil is hard to move freely as the photographer needs; (2) after use to attract more difficult to remove. In order to overcome this shortcoming, it is necessary to reduce its viscosity properly. Therefore, iodine compounds of some higher fatty acid ethyl esters are commonly used abroad, such as ethyl diiodo icosanoate (C_ (21) H_ (41) I_2CO_2C_2H_5) Ethyl iodo-phenyl undecanoate