Skull tomography: what it is and how it is done

Computed tomography of the skull is an examination performed on a device that allows the diagnosis of several pathologies, such as stroke detection, aneurysm, cancer, epilepsy, meningitis, among others.

Generally, cranial tomography lasts about 5 minutes and does not cause pain, and preparation for the exam is relatively simple.

What is it for

Computed tomography is an exam that helps the doctor to diagnose certain diseases, such as stroke, aneurysm, cancer, Alzheimer's, Parkinson's, multiple sclerosis, epilepsy, meningitis, among others.

Know the main types of computed tomography.

How the exam is done

The examination is performed on a device, called a tomograph, which is shaped like a ring and emits X-rays that pass through the skull and are captured by a scanner, which provides images of the head, which are then analyzed by the doctor.

In order to be examined, the person must undress and wear a gown and remove all accessories and metallic objects, such as jewelry, watches or hair clips, for example. Then, you should lie on your back on a table that will slide into the appliance. During the exam, the person must remain immobile, so as not to harm the results, and at the same time, the images are processed and archived. In children, anesthesia may be necessary.

The exam lasts about 5 minutes, however, if contrast is used, the duration is longer.

When the test is performed with contrast, the contrast product is injected directly into a vein in the hand or arm. In this exam, the vascular behavior of the structures under analysis is evaluated, which serves to complete the initial evaluation that is performed without contrast. Know the risks of the contrast test.

How to prepare for the exam

Generally, to take the exam it is necessary to fast for at least 4 hours. People who take medications can continue to take treatment normally, with the exception of people taking metformin, which must be discontinued at least 24 hours before the test.

In addition, the doctor should be informed if the person has kidney problems or uses a pacemaker or other implanted device.

Who should not do

Cranial tomography should not be performed on people who are pregnant or suspect they are pregnant. It should only be done if it is really necessary, due to the radiation that is emitted.

In addition, contrast tomography is contraindicated in people with hypersensitivity to contrast products or with severe renal impairment.