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Alternative namesLaminagraphy; Planigraphy; Stratigraphy; Tomogram - chest
DefinitionA tomogram refers to a slice, or section, which is imaged by moving the X-ray tube and recording film simultaneously and in opposite directions. This method serves to blur out structures in front of and behind the area of interest.
How the test is performedThe test is performed in a hospital radiology department or in the health care provider's office by an X-ray technician. You will likely be asked to lie on your back on the X-ray table. You will need to remain still during the test.
How to prepare for the test
Inform the health care provider if you are pregnant. You must wear a hospital gown. You must remove all jewelry.
Infants and children:
How the test will feelThere is generally no discomfort associated with tomography.
Why the test is performedTomography is used to further examine a chest lesion when other tests are inconclusive.
The test will show pulmonary densities (cavitation, calcification, and presence of fat in the lungs), tumors, or lesions (any breakdown of the tissue).
What abnormal results meanThe chest tomography may show lesions or tumors, help differentiate blood vessels from a small protuberance or swelling , and identify bronchial dilation or narrowing.
What the risks areThere is low radiation exposure. X-rays are monitored and regulated to provide the minimum amount of radiation exposure needed to produce the image. Most experts feel that the risk is low compared with the benefits. Pregnant women and children are more sensitive to the risks of the X-ray .
In modern hospitals and medical centers, plain film tomography has been superceded by computed tomography (CT).
Update Date: 5/2/2003Benjamin Taragin, M.D., Department of Radiology, Columbia Presbyterian Medical Center, New York, NY. Review Provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT