CT - CISTERNOGRAM

CT

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CT - CISTERNOGRAMHow does CT work? CT uses X-rays to perform its work. These X-rays come from an X-ray tube which is placed inside a square machine called the gantry. The part of your body to be scanned goes inside a hole in this gantry. Why is CT such a good modality? Ordinary X-ray pictures are one-dimensional representations of body parts but CT allows us to section the body to view its inner parts. Thus, the skull X-ray only shows us the outer part, whereas CT shows us the inner parts of the brain. Where is CT useful? All parts of the body can be scanned with CT. For each part, there are specific indications or reasons for scanning. Your referring doctor and the consultant radiologist are the best judges of the usefulness of CT scanning in a specific situation and areas. Are there any dangers of CT scanning? Though X-rays involve radiation, there are no dangers, in practice. In women who are pregnant, however, CT scanning should be done after weighing all the risks. What is the injection that I may receive? Majority of the patients will be injected with a "dye" which enhances the ability of CT scans to pick up abnormalities. This is routine. The dye used is a non-ionic contrast medium, which is much safer than the routine, cheaper, ionic dyes. Are there any complications because of the "dye"? 0.5% of patients may get nausea and redness of the skin. Though severe reactions are known, these are very rare and uncommon.

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Why is it ? Collection Instructions What is the test ?

Why is CT - CISTERNOGRAM done ?

Computed tomography (CT) cisternography is an imaging technique used to diagnose CSF rhinorrhea or CSF otorrhea (CSF leaks), as CT allows the assessment of the bones of the base-of-skull.

CT - CISTERNOGRAM Instructions

CCO:
Ask for the status of pregnancy or breastfeeding in a female patient.Ask for any previous allergies to contrast matierial.Serum creatinine test should be done before the procedure.No food intake 6 hrs prior to CT SCAN. Only liquids can be taken untill CT SCAN is done.Metformin/Glibenclamide should be withheld on the day of procedure and for atleast 48hrs after the procedure . Medications like phenothiazines, tricyclicantidepressants, monoamine oxidase inhibitors, SSRI should bediscontinued for at least 24 to 72 hours prior to the procedure.All the other regular medications can be taken with sips of water.Ask for any history of claustrophobia.

SLAs:
For CT test scheduled before 8 AM eConsultation will be scheduled before 9 PM same day and the physical reports to be delivered by 10 PM same day
For CT test scheduled after 8 AM eConsultation to start from 8 AM next day and the physical reports to be delivered starting from 8 AM next day

FACILITATOR:
Confirm the compliance of preparations required. Ask the patient to wear comfortable clothes free of metals, zippers, hooks.

Why is CT - CISTERNOGRAM ?

CT cisternography is an imaging technique used to diagnose CSF rhinorrhea or CSF otorrhea(CSF leaks) as CT allows the assessment of the bones of the base-of-skull.Cisternograms are used to diagnosis CSF (cerebrospinal fluid) leakage. A CSF leak can occur after trauma and it is often difficult to tell exactly where the location of the leakage is. In order to determine the position of the leak a CONTRAST material is injected into the subarachnoid space via a lumbar approach. The patient is then tilted with the head down and a CT scan is performed to see where the CSF and the CONTRAST is leaking out. A cisternogram can also be performed with a nuclear medicine technique. This is slightly more sensitive, but the anatomic resolution is lower than the CT cisternogram.