Download Is MRI superior to other imaging techniques (CT-scan, x

Is MRI superior to other imaging techniques (CT-scan, x-ray, etc.)?
Often, yes. MR images can be made from many different angles to give a better view of
the tissues in question. MRI can also provide a level of detail that is often difficult to
achieve with x-rays or other imaging systems. Because it captures relatively subtle
difference in shape and appearance, an MRI image can help your veterinarian determine
which tissues are healthy and which are not. MR images are superior to all soft tissue
images as compared to other imaging modalities; however, one needs to localize the area
of interest to be imaged. If one does not know the area of concern a "Bone Scan" or
Nuclear Scintigraphy would be a better choice of imaging. Once the problem area is
localized, a MRI may be indicated. CT scan is great for looking at bone and a CT scan
with contrast will show the blood vessels around soft tissue but High Field MRI is still
"king" when looking for cartilage defects or soft tissue problems.
What does "High Field" mean?
When a patient is in a MRI scanner the body puts off a signal that is picked up by the
imaging coil. Generally speaking, the higher the field strength of the magnet, the higher
the signal received by the imaging coil. Higher signals yield better image quality.
Magnets are categorized by their field strength. Magnets of 1.0 Tesla or higher are
considered high field magnets. Magnets between 0.5 Tesla and 1.0 Tesla are considered
mid-field magnets. Magnets below 0.5 Tesla are considered low field, magnets. 1.5 Tesla
magnets are considered the best for identification of orthropedic problems. Also, the
closer the imaging coils are to the structures being imaged results in better quality images.
The higher field magnet acquires an image much faster than lower field magnets which
increases the quality of the image because there is less motion.