Meaning: Computed tomography combines the technologies of radiologic imaging and computer analysis to provide detailed images of thin cross sections of brain.
It uses an x-ray beam to take cross sectional pictures of brain. The computer then calculates the x-ray penetration of each tissue, creating a three dimensional view.
· Head trauma
· Cerebrovascular disturbances
· Identification of space occupying lesions (SOL)
· Intracranial tumors
· Brain abscesses
· Intracranial hemorrhage
· Abnormal brain development
Anaphylactic reaction following the use of contrast dye
· X-ray films
· X-ray machine
· Contrast dye
Preparation of the patient
· Explain the procedure to the patient
· Remove all metal objects from the patient
· Keep nil per oral for four hours before the procedure
· Ask whether patient is allergic to iodine dyes, fish or shell fish
· Explain the that he has to lie down still and he will hear a clicking sound as the machine moves around his head
· Explain the purpose of intravenous line if contrast dye is used
Monitor the patient for allergic reactions — tachycardia, increased respirations, flushing, urticaria and vomiting.
Post procedure care
Observe the patient for any allergic reactions as mentioned above.
Encourage the patient to drink fluids as the contrast dye causes rapid dieresis.
Monitor the patient with known history of cardiac diseases for signs and symptoms of fluid overload. Because the dye is hypertonic and it may cause hypervolemia.