How is a ct myelogram performed

It is particularly good at imaging hard tissue such as bony structures. The equipment is shaped like a donut or ring with a movable table that slides in and out of the ring. The scanning system includes a computer that creates pictures represented as cross-sections or slices of the target anatomy, such as a specific part of the spine.

Capturing similar images is not possible with traditional x-rays. After the dye is injected, the contrast dye serves to illuminate the spinal canal, cord, and nerve roots during imaging. Thus, when a CT scan and myleography are combined, images are produced that clearly show both the bony structures of the spine and the nerve structures.

Myelograms are much less commonly performed today than in the past but may still be indicated in special situations and with complex problems. The procedure is often performed in a hospital x-ray department or a special radiology center.

Pre-test instructions include:. The test has two parts: injecting contrast dye into the spine and then taking pictures. First, the patient is positioned lying on his or her back or side on a movable table that slides into a CT scanner. Next, the skin area is prepared with an antiseptic to help prevent infection. A local anesthetic is injected to numb the area prior to injection of the contrast dye.

In other words, some of the cerebrospinal fluid CSF is removed and replaced with the same amount of contrast dye. The patient is positioned on his or her side with the knees tucked up under the chin or as close to the chin as possible. Bringing the knees up under the chin creates more space between the vertebrae. Under fluoroscopic guidance an advanced type of imaging technology the needle is positioned into the spinal canal through one or two puncture or tap sites.

Fluoroscopy is also used to monitor the injection of the contrast dye and to view it as it percolates within the CSF around the nerve roots and spinal cord. A myelogram may be done to assess the spinal cord, subarachnoid space, or other structures for changes or abnormalities. It may be used when another type of exam, such as a standard X-ray, does not give clear answers about the cause of back or spine problems. Myelograms may be used to evaluate many diseases, including:.

There may be other reasons for your healthcare provider to recommend a myelogram. There is a risk of an allergic reaction to the contrast dye. Be sure to let your healthcare provider know if you have ever had a reaction to any contrast dye. Because the contrast is injected into the cerebrospinal fluid CSF which also surrounds the brain, there is a small risk of seizure after the injection.

Because this procedure involves a lumbar puncture, these potential complications may occur:. There may be other risks depending on your specific medical condition. Be sure to discuss any concerns with your healthcare provider before the procedure. If you are having a myelogram at Johns Hopkins Hospital or Bayview Medical Center, a neuroradiologist or radiology nurse will contact you by phone two or three days prior to your myelography to discuss the procedure and answer any questions you may have.

Options should be discussed with you and your doctor. A gown will be provided for you. However, the procedure may also be done while you remain in your clothes from home. For this reason, try to wear non-restrictive, comfortable clothing and slip on shoes if possible. Please remove all piercings and leave all jewelry and valuables at home. If you are not sure if it is safe for you, contact your primary care provider or referring provider.

However, on the day of the procedure, do not eat for three hours before the procedure. You may have liquids and can take your usual medications unless previously advised to hold certain medications in preparation for the myelography. Please bring a current list of your medications and allergies with you. This is for your safety and comfort. A myelogram may be done on an outpatient basis or as part of your stay in a hospital.

For outpatients, please allow four hours for the preparation, procedure, and recovery time. Generally, a myelogram follows this process:. You may experience discomfort during the myelogram. The radiologist will use all possible comfort measures and complete the procedure as quickly as possible to minimize any discomfort or pain. You need to sit or lay down for several hours after the procedure to reduce your risk of developing a CSF cerebral spinal fluid leak.

Most patients are asked to lie down for two hours after the procedure. If you need to urinate, you may need to do so in a bedpan or urinal during the time that you need to stay flat. October is Breast Cancer Awareness Month! Privacy Legal. What is a CT Myelogram?

Where can I schedule this exam? How should I prepare for my exam? Do not eat solid foods for 2 hours prior to your exam. Drink an increased amount of clear liquids water and juices the day before and after your exam. If you have an active infection and are taking antibiotics, the medication course must be complete prior to the procedure, to ensure that no infection remains. If you are taking blood thinners Coumadin, Plavix, Ticlid , you will have to hold the medication prior to the procedure.

Contact your healthcare provider before stopping any medication to determine if it is safe for you. Certain medications can make you slightly more susceptible to seizures and should not be taken for 48 hours before or 24 hours after a myelogram.

These include many anti-depressants, anti-psychotics and MAO inhibitors. Please discuss your medications with your healthcare provider before this procedure. Wear comfortable clothes without metal fasteners, including zippers, buttons and snaps. Bring someone to drive you home. Do not drive until the next day. Arrive 15 minutes early to complete registration.