The process is painless.
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An x-ray tube slowly rotates around you, taking many pictures from all directions. A computer combines the images to produce a clear, two-dimensional view on a television screen. You may need a CT scan if you have a problem with a small, bony structure or if you have severe trauma to the brain, spinal cord, chest, abdomen, or pelvis. Sometimes, you may be given a dye or contrast material to make certain parts of your body show up better. A CT scan costs more and takes more time than a regular x-ray.
It can be done in either a hospital setting or an outpatient imaging center. Magnetic resonance imaging MRI is another diagnostic imaging technique that produces cross-sectional images of your body. The MRI tool uses magnetic fields and a sophisticated computer to take high-resolution pictures of your bones and soft tissues.
Tell your doctor if you have a pacemaker, implants, metal clips, or other metal objects in your body before you undergo an MRI scan. You lie as motionless as possible on a table that slides into the tube-shaped MRI scanner. The MRI creates a magnetic field around you and then pulses radio waves to the area of your body to be pictured.
The radio waves cause your tissues to resonate.
A computer records the rate at which your body's various parts tendons, ligaments, nerves, etc. You will not feel any pain while undergoing an MRI, but the machine may be noisy.
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An MRI may be used to help diagnose torn knee ligaments and cartilage, torn rotator cuffs, herniated disks, osteonecrosis, bone tumors, and other problems. It may take from 30 to 60 minutes to do the study. Ultrasound uses high-frequency sound waves that echo off the body. It is painless and noninvasive, and does not require radiation.
Ultrasound is used most often to look for blood clots, but can also show other problems, such as a Baker's cyst behind the knee or even a rotator cuff tear in the shoulder. Bone scan.
Hollis G. Potter, MD
A bone scan uses a small amount of radioactive material to identify areas of increased bone activity. The material is injected into a vein and is absorbed by areas that are forming new bone, such as a healing fracture, bone tumor, or bone infection. The scan is done several hours after the injection. The radioactive material is eliminated quickly from the body.
AAOS does not endorse any treatments, procedures, products, or physicians referenced herein. This information is provided as an educational service and is not intended to serve as medical advice. Anyone seeking specific orthopaedic advice or assistance should consult his or her orthopaedic surgeon, or locate one in your area through the AAOS Find an Orthopaedist program on this website.
In this x-ray of an ankle, the tibia and fibula bones are fractured. The pieces of bone are severely out of place.
Imaging of the Knee
Medicine Radiology. Diagnostic Imaging Free Preview. Comprehensive review of imaging of the knee All imaging techniques and their applications discussed Wealth of illustrative material Written by acknowledged experts see more benefits. Buy eBook. FAQ Policy. About this book This volume provides an up-to-date and comprehensive review of imaging of the knee. Show all.
Imaging of the Knee - Techniques and Applications | A. Mark Davies | Springer
From the reviews: "Imaging of Knee: Techniques and Applications is a readable, well-put-together textbook that would be of considerable interest to radiologists, orthopedic surgeons, and rheumatologists. Arthrography Pages Davies, A. Mark, MD et al.
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