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Evaluate the use of contrast media in diagnostic imaging. - Coggle Diagram
Evaluate the use of contrast media in diagnostic imaging.
evaluate - overall judgement, explain extent of effectiveness and usefulness. mention indications but also associated patient prep and health and safety.
introduction - contrast media is used in radiography to enhance the radiographic contrast of surrounding tissues. contrast medias are either more radioluent or more radiopaque than surrounding tissues. (contrast medias are positive or negative) their are associated indications and contraindications for each type plus clinical indications, however contrast media has been superseeded by other more advanced diagnostic imaging modalities, however it still has diagnostic importnce in first opinion practice in some cases, the types od contrast media, and imdications will be evalauted through this essay.
types of contrast media
positive - agents have a high atomic number + density, highly radiopaque, provide positive contrast and have a white apperance - barium, ionic/ non ionic water soluable iodine based media
negative - highly radiolucent, negative contrast, appear black - room air ( can cause air embolisum) so C02 and N20 safer.
double contrast media - negative and positive contrast media used in combination - studies of hollow organs e.g bladder, plus optimal mucosal detail.- used for hollow organs
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conclusion - overall contrast media is a useful tool in diagnostic imaging, however the time consuming nature and asssociated health concerns mean it may be contraindicated. additionally the development of more advanced imaging tecniques such as endoscopy, ultrasound, MRI etc has meant that these tecniques are much less used and have less diagnostic value in some cases
MRI - use gadolidium - paramagentic properties, increces speed that protons realign with magnetic feild = brighter image.
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