Computer Tomography

Commonly referred to as a CAT scan, creates images through the use of X-rays emitted from a X-ray tube that pass through the body. Radiation leaving the body is recorded by an array of detectors mounted on the CT scanner, along with the X-ray tube. During each rotation, about 1,000 images are recorded with the x-ray beam. These images are then reconstructed by a computer into a very detailed two-dimensional view of the interior of the body.

The CT equipment used by UMI is a state-of-the-art helical device that can provide the most comprehensive diagnostic body, musculoskeletal, and neurologic scanning available.

The Procedure 

CT scanning is a pain-free procedure. You will be alone during the scan, but the technologist can see and hear you and can speak to you at any time from the adjacent control room.

The first step is for the technologist to make certain that you are correctly positioned on the CT table. Pillows may be used to help maintain the correct position during the examination. For the initial scans, the table will move rapidly through the scanner to determine the correct starting position. The rest of the scans are made as the table moves more slowly through the cavity in the scanner. The best CT scans are obtained when you are able to hold your breath. If this is not possible, you will be asked to breathe quietly and regularly.

If contrast material is injected, you may feel a flush of heat or you may experience a warm sensation throughout your body. Occasionally the sensation is in the pelvic area, and you may feel as though you have urinated, but have not. You may also experience a metallic taste in your mouth. The sensation is often mild, and typically lasts only 30 seconds.

After the CT examination is completed, you may have to wait a short time while the radiologist checks the scans to make sure the quality is good enough to be correctly interpreted. If necessary, a few additional scans will be obtained.

The examination usually takes only 15 minutes. 

General preparation tips 

Because many CT exams involves the injection of a commonly used contrast agent, we ask that certain preparatory steps be followed prior to your exam.

• If you have severe asthma, are allergic to multiple medications, or have previously had an allergic reaction to x-ray contrast, please contact our nursing department at 341-9120 prior to your appointment.
• Please be sure to eat or drink nothing (not even water) for at least 2 hours prior to the scheduled time of your CT exam.
• If you are taking a prescription for either Glucophage or Glucovance, do not take it on the day of your exam.
• Please bring all relevant insurance information; your referral paperwork; and copies of X-rays and/or any prior exams.

• For CT scans of all areas other than the abdomen or pelvis:

• Please arrive at UMI no less than 15 minutes before the scheduled time of your exam.
• The total length of your exam time is expected to be approximately 15 to 30 minute

• For abdominal or pelvic CT scans:

• Please arrive at UMI no less than 60 minutes before the scheduled time of your exam.
• Please note that oral, rectal, or intravenous contrast may be used.
• The estimated length of your entire appointment will be 90-120 minutes.

Special conditions 

Please contact UMI in advance of your appointment if any of the following conditions apply to you:

• UMI is unable to accommodate patients confined to stretchers. If this applies to you, your exam must be conducted at Strong Memorial Hospital.
• If you use a wheelchair, be advised that UMI has limited appointments to normal weekday business hours only (i.e., no evenings or weekends).
• The table used in the CT exam has a weight limit of 450 lbs. If your weight exceeds this figure, please contact us in advance so that alternative imaging procedures or locations may be discussed.

For more detailed information on many radiology procedures, please visit this informational site.