Contrast Agents in Radiography

Barium sulfate is nontoxic, has a relatively high density, and attenuates X-rays well.

Air is added to the barium sulfate suspension by ingesting fizzy granules or directly instilling air.

Iodine has a high atomic mass, markedly attenuates X-rays, and is naturally excreted via the urinary system.

<p>Precautions are necessary to prevent anaphylactic reactions in some patients.</p> Signup and view all the answers

<p>Precontrast images are inverted to create negatives, then added to postcontrast images to subtract bones and soft tissues.</p> Signup and view all the answers

<p>Digital imaging has made the process relatively straightforward and instantaneous.</p> Signup and view all the answers

<p>They help visualize the kidneys, ureter, and bladder in intravenous urography.</p> Signup and view all the answers

<p>It provides enhanced visualization of the bowel lumen.</p> Signup and view all the answers

Barium sulfate is a contrast agent in X-ray imaging, as it is nontoxic, has a high density, and readily absorbs X-rays.

Air is introduced into the barium suspension to enhance visualization, achieved by ingesting fizzy granules or directly introducing air.

Iodine's high atomic mass, strong X-ray absorption, and natural excretion through the urinary system make it a suitable contrast agent.

Cautious administration is necessary to mitigate the risk of anaphylactic reactions in some patients.

A subtraction angiography technique uses subtracted images to highlight target blood vessels by removing superimposed structures.

Digital imaging has transformed subtraction angiography, making it a faster and simpler process.

Intravenous contrast agents are used to visualize the kidneys, ureters, and bladder in a procedure called intravenous urography.

Double-contrast studies, using both air and barium, allow for better visualization of the bowel lumen, enhancing diagnostic accuracy.