This invention describes a new type of X-ray contrast agents. It has been found that iodinated alkenes containing one or several C=C double bonds substituted with electronic neutral substituents and iodine can be used as X-ray contrast agents. Also new iodoalkene compounds are described.
Radiopaque bismuth particles and methods of making and using the radiopaque bismuth particles are disclosed. The radiopaque bismuth particles include an elemental bismuth core and an outer coating comprising one or more coating agents. Disclosed radiopaque bismuth particles are suitable for use in surgical sponges and plastic objects.