MRI scan being performed on a foot
What Is MRI?
MRI is a diagnostic technique using a magnetic field to produce pictures of structures inside the body. The MRI machine uses a very strong magnetic field and pulses of radio waves. The machine creates an image based on the way hydrogen atoms in the body react to the magnetic field and the radio waves. MRI signals can give an image of a single slice of any part of the body (e.g. a joint or foot). Usually, these "slices" are combined to give a three-dimensional picture, which enables us to observe injuries that cannot be seen with any other equipment.
Examples of MRI Usage
An excellent use for MRI, for example, is the hoof: the hoof is comprised of many soft tissue structures that cannot be seen on x-ray, and cannot be reached by ultrasound waves. We are now able to identify damage to these tissues and finally provide an explanation for many frustrating foot lameness cases, and suggest new treatments and shoeing techniques.
MRI also allows evaluation of bone injury that is not visible on x-rays, such as fluid build-up and bruising, and early fractures before they become obvious cracks. The MRI system is used when a lameness can be localized to a specific area such as a particular foot or fetlock, but shows no abnormalities on digital x-ray or ultrasound.
Sample MRI Images
These are sample MRI images of foot (left), and a carpus (right):
Procedure
Magnetic Resonance Imaging allows a scan to be performed on a standing sedated horse, which eliminates general anesthesia and hospitalization required with traditional lying-down systems. The examination takes about 2 hours to complete.
MRI Appointments
Appointment times are typically booked within 1 week.