Computed Tomography
Head Scan
What is a CT Scan of the Head? A CT Scan (sometimes referred to
as a CAT Scan) is a noninvasive medical test to diagnose medical
conditions. It combines special x-ray equipment with
sophisticated computers to produce multiple cross sectional images
of the inside of the body. These cross-sectional images
of the area being studied are examined on a computer monitor and
can be transferred to a CD.
A CT scan can visualize the brain structures, bones and blood
vessels. If intravenous (IV) contrast is used, it provides greater
clarity and will reveal more details than regular x-ray exams.
How do I prepare for this Test? Please wear
comfortable, loose-fitting clothes to your exam. You may be asked
to change into a hospital gown for your comfort. You must not eat
or drink anything for 2 hours prior to your exam. If
necessary, you may take your daily meds with a small amount of
water. Please bring a list of all your current medications
and allergies. We can make a copy of your medication list if
needed. Please report to the Outpatient Registration
Department 15 minutes prior to your scheduled exam time. Outpatient
Registration and Radiology Departments are located on the first
floor of Beverly Hospital, Lahey Outpatient Center, Danvers and
Addison Gilbert Hospital. The technologist will greet you in the
Radiology Department and escort you to the exam room.
What to Expect During the Head CT? Although
you may or may not receive IV contrast, you will be required to
answer questions that our Technologist will review with you.
The decision to administer IV contrast will be made by your
ordering Physician and/or our Radiologist. The
technologist will position you on the table lying on your
back. If you receive the contrast, an IV will be inserted in
a vein in your arm. You will feel a pin prick when the
needle is inserted. When the IV contrast is administered, you
may feel a warm, flushed sensation and a metallic taste in your
mouth that lasts for a few minutes. You may also experience a
sensation like you have to urinate but this subsides quickly.
The table will move quickly through the scanner to determine the
correct starting position for the scan. Then the table will
move more slowly through the machine as the actual CT scanning is
performed. You will be alone in the exam room during the CT
scan, unless there are special circumstances. However, the
technologist will always be able to see, hear and speak with you at
all times.
Testing Time: The entire examination is usually completed
within 15 minutes.
Risk of the Test: Be sure to notify the technologist if
there is any chance you may be pregnant or allergic to IV
contrast.
Following the Test: After your CT exam, if you received
contrast, you will be instructed to drink plenty of fluids to flush
out the IV contrast. If you take a regular dose of
Glucophage (Metformin), you MUST discontinue taking it for 48 hours
following your exam. It is necessary to have a blood test in 2 days
to determine that your kidneys are functioning properly BEFORE you
resume your Glucophage. We will fax your ordering physician
to inform them of your need for a blood test. You will
also receive a letter from us reminding you of this. There are no
other restrictions following the CT exam.
Results of the test: Your ordering physician will receive
the results within 24-48 hours. It is important to discuss
the results of the exam with your doctor.