Radiographic Contrast in Imaging

<p>80%</p> Signup and view all the answers

<p>To improve radiographic contrast</p> Signup and view all the answers

<p>More attenuation of the x-ray beam</p> Signup and view all the answers

<p>To reduce Compton scatter</p> Signup and view all the answers

<p>Pharmacokinetics</p> Signup and view all the answers

<p>Barium sulphate suspensions</p> Signup and view all the answers

<p>Air</p> Signup and view all the answers

<p>Gadolinium</p> Signup and view all the answers

<p>Increased beam attenuation</p> Signup and view all the answers

<p>Easier to pick up pathology</p> Signup and view all the answers

<p>Increased signal intensity</p> Signup and view all the answers

<p>Go to the emergency department and let them know</p> Signup and view all the answers

<p>70%</p> Signup and view all the answers

<p>To ensure the patient is not allergic to the contrast media</p> Signup and view all the answers

<p>Discontinue the injection and remain calm</p> Signup and view all the answers

<p>To have easy access to emergency medications</p> Signup and view all the answers

<p>Contrast media has been found in sewage water, surface water, and drinking water</p> Signup and view all the answers

<p>Their high degree of echogenicity</p> Signup and view all the answers

<p>It is more natural to the body and carries a lower risk</p> Signup and view all the answers

<p>To target specific structures or organs</p> Signup and view all the answers

<p>Their attenuation and ability to opacify the bowel</p> Signup and view all the answers

<p>To ensure accurate timing of the contrast media</p> Signup and view all the answers

<p>Tissue damage and thrombus formation</p> Signup and view all the answers

<p>It allows for real-time imaging of the vasculature</p> Signup and view all the answers

<p>It is physiologically inert and produces adequate radiographic contrast</p> Signup and view all the answers

<p>Mild</p> Signup and view all the answers

<p>To ensure accurate placement of the contrast media</p> Signup and view all the answers

<p>By increasing the beam attenuation due to high Z, resulting in areas of decreased density on the image.</p> Signup and view all the answers

<p>By increasing clarity and contrast, allowing for easier detection of pathology.</p> Signup and view all the answers

<p>It interacts with nearby water molecules to affect the signal intensity of the anatomy, resulting in a brighter signal on MRI.</p> Signup and view all the answers

<p>Because they are insoluble and dense, allowing for clear visualization of the GI tract on images.</p> Signup and view all the answers

<p>They increase clarity by decreasing beam attenuation, resulting in a higher contrast on images.</p> Signup and view all the answers

<p>Positive contrast agents increase density, while negative contrast agents decrease density, resulting in increased clarity and contrast on images.</p> Signup and view all the answers

<p>Subject contrast is caused by the difference in density of the surrounding tissue, whereas image contrast is controlled by the equipment and processing. The final image is a combination of both subject and image contrast.</p> Signup and view all the answers

<p>The density and thickness of anatomy affect subject contrast by increasing attenuation, which can be altered by positioning. This means that thicker tissues will result in lower subject contrast, making it more challenging to distinguish between different structures.</p> Signup and view all the answers

<p>Compton scatter negatively impacts contrast by increasing noise on the image. It can be reduced by using grids or air gap technique, collimation, and administering contrast media to the patient.</p> Signup and view all the answers

<p>kVp controls contrast, and a low kVp increases contrast by reducing the number of greyscales. This results in better subject contrast, but may also increase the risk of noise on the image.</p> Signup and view all the answers

<p>Pharmacodynamics refers to the biochemical and physiological effects of a drug on the body, while pharmacokinetics refers to the movement of the drug within the body. In radiography, pharmacokinetics is more relevant as it affects the absorption, distribution, metabolism, and excretion of contrast media.</p> Signup and view all the answers

<p>Contrast media is used to enhance the visibility of different structures in the body by altering their density and absorption. It interacts with the body through pharmacokinetics and pharmacodynamics, allowing for better image quality and diagnostic accuracy.</p> Signup and view all the answers

<p>Beam strength affects radiographic contrast by controlling the penetration of the X-ray beam. A stronger beam can result in lower contrast, while a weaker beam can result in higher contrast, but may also increase the risk of noise on the image.</p> Signup and view all the answers

<p>Windowing can modify image contrast by adjusting the display of the image. This can improve the visibility of certain structures, but may also affect the overall contrast and diagnostic accuracy of the image.</p> Signup and view all the answers

<p>High degree of echogenicity or ability to reflect ultrasound waves</p> Signup and view all the answers

<p>Low osmolarity contrast media is less harmful and more natural to the body, with an osmolarity of around 3 times that of human serum, whereas high osmolarity contrast media has an osmolarity of 5-8 times that of human serum and has a higher risk of adverse reactions.</p> Signup and view all the answers

<p>Gastrografin is safe for patients with bowel perforation and those allergic to barium, and it can be flavored to make it easier to drink.</p> Signup and view all the answers

<p>Tissue damage, thrombus formation, and injection site reactions are potential risks associated with extravasation of contrast media.</p> Signup and view all the answers

<p>To deliver contrast media at a controlled rate and pressure to ensure optimal imaging results.</p> Signup and view all the answers

<p>Mild reaction</p> Signup and view all the answers

<p>An ideal contrast media should be non-toxic, inert, stable, and physiologically inert, with low osmolarity and suitable viscosity and persistence.</p> Signup and view all the answers

<p>To allow for more targeted and localized imaging of specific areas of interest.</p> Signup and view all the answers

<p>Improved visualization of blood vessels and better diagnosis of vascular diseases.</p> Signup and view all the answers

<p>Injection site reactions, including tissue damage, thrombus formation, and extravasation.</p> Signup and view all the answers

<p>They should go to the ED and let them know about the contrast media examination.</p> Signup and view all the answers

<p>70%</p> Signup and view all the answers

<p>To identify potential risks and take necessary precautions.</p> Signup and view all the answers

<p>Contrast media is found in sewage water, surface water, and drinking water in many regions.</p> Signup and view all the answers

<p>Discontinue injection, stay calm, and follow department protocol.</p> Signup and view all the answers

<p>In case of an emergency or reaction to contrast media.</p> Signup and view all the answers