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Radiocontrast agents are substances used to enhance the visibility of internal structures in X-ray -based imaging techniques such as computed tomography (contrast CT), projectional radiography, and fluoroscopy. Radiocontrast agents are typically iodine, or more rarely barium sulfate.
Positive contrast agents are substances that increase the X-ray attenuation within the body, making the tissues or structures containing these agents appear whiter or brighter on the X-ray image. These agents are generally radiopaque, meaning they absorb X-rays more readily than surrounding tissues.
Oct 11, 2019 · Radiocontrast media are the agents used to increase the contrast of an image, to enhance the visibility of internal structures in imaging technology. Radiocontrast media can be given orally or intravenously. The agents commonly used are barium-based (orally) and iodinated agents (intravenously).
May 30, 2024 · Iodinated contrast media are contrast agents that contain iodine atoms used for x-ray-based imaging modalities such as computed tomography (CT). They can also be used in fluoroscopy, angiography and venography, and even occasionally, plain radiography.
Oct 14, 2015 · The use of enteric contrast agents and contrast agents during pregnancy and nursing are reviewed briefly. Current knowledge for safe use of contrast media and key concepts that all radiologists should know are summarized in this review.
Nov 1, 2023 · Radiocontrast agents are generally materials with high X-ray attenuation coefficients that are easily visualized on an X-ray radiograph or CT image. These agents may be injected into veins to visualize vasculature, injected intrathecally to visualize spinal structures, or injected into a lymphatic vessel for lymphangiography.
Radiocontrast agents can enter the nephron by filtration and/or secretion, depending on the agent administered. The changes in renal hemodynamics induced by radiocontrast media primarily result from the large osmotic load delivered to the distal segment of the nephron.
Oct 2, 2003 · Radiocontrast-agent–induced nephropathy is a common cause of acute renal failure, 1–3 which can range from a transient elevation of the serum creatinine concentration to permanent renal...
Radiographic contrast agents are triiodinated benzoic acid derivatives, usually the sodium or methylglucamine salts, of detrizoate or iothalamate. Contrast agents are freely filtered at the glomerulus, with the kidney as the primary organ responsible for their excretion.
Dec 29, 2017 · The specific radiocontrast agent that is associated with a patient’s adverse reaction must be displayed in the drug intolerance or drug “allergy” field of their electronic health record to enable effective management and prevention of future reactions.
