PET produces images of metabolic activity as opposed to images of the body's physical structures that are derived from these other imaging techniques. Note the following example:

One of the most basic differences between the two tests is that CAT Scanning uses x-rays and MRI does not. In most situations, MRI is superior to CAT in the demonstration of soft tissue pathology. Your doctor can best advise which test would be most appropriate for you.

The MRI scan gives us a high-resolution image of the brain. In conjunction with other tests it can help localize the brain region responsible for the patient's seizures. In patients with certain types of epilepsy, the MRI abnormalities can be fairly subtle. The expertise of a neuroradiologist trained to detect these abnormalities is often needed. In patients with suspected temporal lobe epilepsy, special MRI techniques are needed to maximize the probability these abnormalities will be detected.

A PET scan produces images of metabolic activity as opposed to images of the body's physical structures that are derived from these other imaging tests. This is important because functional changes often predates structural changes in tissues. PET images may therefore demonstrate changes long before they would be revealed by modalities like CT and MRI.

X-ray is electromagnetic radiation capable of penetrating solids, used to photograph and examine parts of the body, and the X signifies their unknown nature. Ultrasound is sound with a frequency greater than 20,000 Hz, approximately the upper limit of human hearing. It is used to photograph and examine parts of the body. A CAT Scan, or C (Computerized) A (Axial) T (Tomography), uses a scanner x-ray machine to take a cross section x-ray image of the body. It is also called a CT scan.

PET (positron emission tomography) scans show changes in certain tissues and/or organs. PET scans can determine the extent of cancer or how the body is responding to treatment. CT scans use a computer to combine multiple x-rays into a two-dimensional cross-sectional image. These images can show the location and extent of the tumor and may indicate any spreading into the lymph nodes. A PET/CT combines both technologies into one scan. It can more accurately determine stage and surgical candidacy.

These costly, sophisticated machines require specialists who will perform the tests and interpret the results. Should your clinician recommend these tests, you will be referred to an outside agency.

CAT Scan is a commonly used term that refers to Computed Axial Tomography. CAT or CT Scanning was developed after Ultrasound and uses x-ray technology. CAT Scanning is fast, patient friendly and has the unique ability to image a combination of soft tissue, bone, and blood vessels. It is a multi use imaging system. For many computed tomography examinations, patients may be asked to take a special contrast agent (orally, rectally or via injection).

Numerous studies have shown that even for people who have large body tattoos there is little to or no irritation. It is recommended that you inform the MRI specialist prior to a treatment that you have had a micropigmentation procedure.

MRI Scanning a single area without contrast will take about 20-40 minutes on the High Field MRI Scanner and 30-45 minutes on the High Field OPEN MRI. If the doctor has ordered multiple body parts to be scanned, then the scans will take longer. CT Scanning will take about 10 minutes for each test ordered. For PET Scans, plan to be here for about 2 hours. The scan itself will take about 35 minutes. Ultrasounds take about 20 minutes.

A PET (Positron Emission Tomography) scan is a procedure in which a small amount of radioactive glucose (sugar) is injected into a vein, and a scanner is used to make detailed, computerized pictures of areas inside the body where the glucose is used. PET scans show the difference between healthy and abnormally functioning tissues and can illuminate the changes in a brain that has memory impairment.

Both MRI and CT scans make cross-sectional images (slices) of pretty much any area of the body using a sophisticated computer system. The major difference is that an MRI uses a large magnet and radio waves to produce images while a CT scanner uses x-rays. Therefore, with the MRI studies, there is no exposure to x-rays.

Computed Tomography (CT) uses x-rays to create a cross-sectional image of the body part being examined. Magnetic Resonance Imaging (MRI) uses a high field strength magnet and radio waves to generate a cross-sectional image.

CT and MRI scans are "anatomic" imaging modalities, which means they look at size and shape of organs and body structures. A PET scan is a "metabolic" imaging modality, which means it looks at function. The information received from a PET scan is different from any other test that is available.

Both of our MRI scanners, CT scanners and our PET scanner are particularly suited for patients who are large or who have claustrophobia. Our Open MRI is so large and wide open that the patient is placed into the scanner sideways. Our high field MRI is much shorter than most MRI scanners as well as having a large opening which is flared. A family member can be in the room with you during the scan. Our MRI scanners hold large patients weighing up to 430 pounds.

For other questions send an e-mail to Dr. George Privett at gwprivett@aol.com or call at 800-755-7441 or (859) 278-7226 in Lexington.

Numerous studies have shown that even for people who have large body tattoos there is little to no potential for irritation resulting from an MRI. In the rare instance where discomfort resulted, it was localized and very temporary. Most people have more metal in their fillings than they would ever have in tattoo work. Copyright ? 1996-2007 Society of Permanent Cosmetic Professionals, All rights reserved and strictly enforced.

After your test, call the office to schedule a follow-up appointment. Dr. Stanley will explain and discuss your results at this time.