许多物质已被用来作为阳性造影剂：银，铋，铯，钍，锡，锆，钽，钨和稀土化合物已被使用造影剂。
A number of substances have been used as positive contrast agents: silver, bismuth, caesium, thorium, tin, zirconium, tantalum, tungsten and lanthanide compounds have been used as contrast agents.
碱：无机化合物，任何碱金属，即锂、钠、钾、铷、铯的可溶氢氧化物。
Alkali: Inorganic compound, any soluble hydroxide -oh. of the alkali metals: lithium, sodium, potassium, rubidium, and cesium.
合成的化合物对铯离子有较高的选择性。
These compounds were found to be highly selective for cesium.
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