You will remove any metallic objects which could diminish the quality of the images (this includes jewelry, glasses, dentures, and hair clips). You may also be asked remove your clothing and put on a patient gown. A technologist will help you to lie face up on the scanner table, with your head toward the “doughnut hole” of the CT scanner. The technologist will position you on the table, and a device to hold your head in place may be used. Then he or she leaves the exam room and goes to the control room, where you can still communicate by intercom.
An intravenous dye (contrast dye) may be given, through injection. This can help to highlight any areas of abnormality in the scan.
While CT images are being taken, it is important to lie still on the table, which will be moving very slowly in order to image the brain. It is normal for the CT scanner to make a whirring noise during the exam, so you should not be alarmed. The table will be moving a few millimeters at a time in order to obtain images of small slices of the brain, until the exam is finished. The procedure usually takes between 20 minutes and an hour.
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