The x-ray table is tilted slowly, allowing the contrast material to reach different levels in the spinal canal. The flow is observed under fluoroscopy, and x rays are taken with the table tilted at various angles.
Intravenous urography
C-T, or computed tomography, is a series of x-rays done in 3 dimensional 'slices' of the study area of the body, which allows for very specific detail of the imaged area. A C-T may be either non-contrast, contrast, or both. No matter what part of the body is being imaged, the liquid contrast material is injected intravenously. A nurse or specially trained technician will start an IV, usually in the arm, and inject the contrast material, and then the C-T scan is performed. If both non-contrast and contrast studies are being performed, the non-contrast study is done first.
MRI, or Magnetic Resonance Imaging, is an imaging technique using a very powerful magnet and sophisticated detectors or 'scanners' to obtain very detailed images of any part of the body. There is no radiation or x-rays involved. The MRI can be non-contrast, contrast, or both. If both, the non-contrast proceedure is done first. No matter what part of the body is being imaged, the contrast is injected intravenously. A nurse or specially trained technician will start an IV, usually in the arm, and then the liquid contrast material is injected, and the MRI performed.
Under sedation and local anaesthetic, a needle is introduced from the groin artery. A catheter is then introduced which is guided towards the heart. Once it reaches the heart vessels, a contrast dye is injected and the images are seen on the screen and recorded.
Contrast is typically a dye that helps to outline organs or blood vessels. Flouroscopy, MRIs, or CAT scans can see much of the body structures without contrast, but to obtain more detailed images a physician may order the tests to be done "with contrast". Other types of contrast material may be barium (ex. a "barium swallow" or upper GI with contrast shows the esophagus and stomach) or radioactive (ex. for thyroid testing).
Done with out contrast
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Example sentences - The xray had to be done again due to poor contrast. The childrens behavior was rude in contrast to their last visit. The colors on the drapes were in contrast to the flooring.
See http://www.webmd.com/back-pain/myelogram-16147 for details and what to expect.
Some CT exams are done w/contrast, some w/o contrast and some are done first w/o and then w/contrast. The body organs show up well w/o contrast. If the Dr. needs to see vasculature then IV contrast would be used. Contrast kind of "highlights" vessels. For instance, tumors need a great deal of blood to grow and if one is suspected a CT w/o may be done first and then a CT of the same area done W/ contrast to verify increased vasculature. The Kidneys and liver and heart all have allot of blood running thru them so these organs can yield more info when done w/ and then w/o contrast. There is also Oral contrast that a patient would drink to "highlight" the stomach and bowels for several different reasons/diagnoses.