![]() So, contrast doesn’t alter anything inside of you, it only alters the way medical imaging equipment sees the inside of you. Similarly, contrasts used in magnetic-powered exams like MRIs and ultrasounds alter the way magnetic fields interact with the parts of the body containing contrast. This changes how the tissues that contain the medical imaging contrast appear on your images. For example, the contrast used in an X-ray or CT exam is made of a substance that will block or limit radiation in certain parts of your body. Your body will naturally absorb or eliminate the contrast materials after your exam.Ĭontrast dye works by using substances that interfere with how the medical imaging equipment takes your images. It will also determine how it needs to be administered (orally or intravenously). The kind of exam you are receiving will determine what kind of contrast you’ll need. In cases where it is needed, contrast ultimately leads to better care.Ĭontrast can be swallowed as a drink or injected into a vein. In turn, this allows them to make a more accurate diagnosis, and recommend the best treatment for your specific case. ![]() This helps them to see what’s going on inside of you better. It doesn’t change any of these things, but it changes how your X-ray, CT, or MRI scan sees them.Ĭontrast is important because it helps radiologists distinguish between normal and abnormal conditions. ![]() It can be an iodine-based material, barium-sulfate, gadolinium, or saline and air mixture that can be swallowed or injected intravenously.Ĭontrast distinguishes, or “ contrasts ,” between organs, tissues, bones, or blood vessels during your imaging exam. You might need contrast when you are having an X-ray, CT, MRI, or ultrasound exam. It’s kind of like a dye in the way that it temporarily changes how your insides appear on a medical image, but it won’t change the color of anything and it won’t hurt you. But receiving contrast dye isn’t like going to the hairstylist-it won’t change the color of your organs and bones!Ĭontrast Dye – What It Does and Why You Need ItĬontrast dye-sometimes referred to as medical imaging contrast, contrast materials or contrast agent-is a substance that radiologists use to see your organs and tissues more clearly in your medical images. Contrast dye (also called medical imaging contrast, or contrast agent) is a substance radiologists use that acts like a dye. ![]() It is good to have a cool design on your website, but the design is worthless if your users can't read your content.If your doctor has ordered you to have a medical imaging exam, you may have a test that uses contrast dye. This is because they don't see bright and dark areas as readily as those without such conditions, and therefore have trouble seeing edges, borders, and other details. Having good color contrast on your site benefits all your users, but it is particularly beneficial to users with certain types of color blindness and other similar conditions, who experience low contrast, and have trouble differentiating between similar colors. See the Solution section below for further information. These ratios do not apply to "incidental" text, such as inactive controls, logotypes, or purely decorative text. Large-scale text (120-150% larger than body text)Īctive user interface components and graphical objects such as icons and graphs ![]() When designing readable interfaces for different vision capabilities, the WCAG guidelines recommend the following contrast ratios: Type of content The color contrast between background and foreground content (that is, usually text) should be great enough to ensure legibility. ![]()
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