Contrast radiography is the utilization of contrast medium to visualize hollow internal viscera, and highlight the structure. Refer to Use of Contrast Agents for special care when using contrast media. Careful sequencing of multiple tests is necessary. As a general rule, the following instructions for sequencing should be followed:
Perform abdominal pelvic plain x-rays, CT, ultrasound, and nuclear medicine studies before contrast studies of the intestines.
Perform imaging of the lower intestine (barium enema) 1 or 2 days before UGI studies.
Perform tests requiring an injection of iodinated contrast, such as an IVP, before any barium studies (e.g., barium enema, UGI).
Consult the radiology department for specific sequencing information.
Take special caution when administering contrast agents to persons with diabetes or kidney problems.
See cautions on effects of concurrent use of codeine and barium contrast agents.
Use fluoroscopy for imaging of diagnostic (moving) structures such as those of the alimentary canal. Use fluoroscopy to localize tumors for biopsy and drainage, guide catheter placement, aid filter stent placement, and monitor vascular filling for both diagnostic and therapeutic purposes (angioplasty).
The radiation dose received from a fluoroscopic examination is higher than that of conventional x-rays. Dose is directly related to length of exposure. The use of digital fluorography tends to reduce dose by pulsing the x-ray beam.
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