Contrast media are so called as they increased the image contrast of anatomical structures which are not normally easily visualised. Contrast media can be grouped as positive or negative, in general positive contrast media are those which have an increased absorption of x-rays and show up as white/grey and negative which have less absorption and show up as dark/grey. An example of each are: positive contrast media - iodinated compounds, negative contrast media gaseous - air or carbon dioxide.
Guidelines with Regard to Metformin-Induced Lactic Acidosis and X-ray Contrast Medium Agents |
