What is a Myelogram?:"A myelogram is a special X-ray of the spinal cord and spinal column."
http://radiology.bidmc.harvard.edu/kinds_of_exams/Xray/myelo.html
Myelography:"A myelogram involves X-rays or a CT scan of the spine after dye has been inserted into the spinal fluid. A lumbosacral spine X-ray is one of the most common X-rays involved with a myelogram.
X-rays are a form of electromagnetic radiation (like light); they are of higher energy, however, and can penetrate the body to form an image on film. Structures that are dense (such as bone) will appear white, air will be black, and other structures will be shades of gray."
http://www.healthcentral.com/mhc/top/003807.cfm
Lumbosacral spine X-ray (Myelography):"The test is performed in a hospital radiology department or in the health care provider's office by an X-ray technician. You will be asked to lie on the X-ray table and assume various positions. If the X-ray is to determine injury, care will be taken to prevent further injury. The X-ray machine will be positioned over the lumbosacral area of the spine. You will be asked to hold your breath as the picture is taken so that the picture will not be blurry. Usually 3 to 5 pictures are taken.
A myelogram is an X-ray or CT scan of the spine that is performed after dye has been injected into the spinal fluid. See the document on lumbar puncture for more information about the dye insertion portion of this procedure."
http://webmd.lycos.com/content/asset/adam_test_myelography
See also:
Magnetic Resonance Imaging -- MRI:"Unlike many diagnostic procedures, there is no special preparation to receive an MRI scan. The patient is placed on a non-magnetic stretcher and slid into what resembles a doughnut shaped magnet. The patient lays comfortably and does not have to move, as the MRI is capable of taking pictures from any angle. The entire procedure usually lasts anywhere from 30 to 90 minutes, during which the technologist introduces radio waves into the magnetic field. This causes the hydrogen, phosphorus and other elements in the body to align themselves in the field. The energy released from this transaction is measured by a computer that in turn generates images that can be recorded on film."
http://www.thespinecenter.com/MRI.htm
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