MRI Scanning
MRI stands for Magnetic Resonance Imaging. MRI scanning was developed in the 1980's and represents the latest technique to be added to the diagnostic imaging stable. MRI does not use X-rays. Instead, the technique involves placing the patient in a strong magnetic field. Radiowaves are transmitted into the patient via coils placed in the magnet. These radiowaves excite hydrogen nuclei in the patient which begin rotating at the same frequency as the radiowaves. These rotating nuclei subsequently emit their own radiowaves. These emitted radiowaves are picked up by receiver coils, amplified and digitized for processing by powerful computers. Multiple sequences of radiowave pulses are needed to build up 2D and 3D images of the region of interest. The images are recorded onto special laser film for viewing by a radiologist. The radiologist issues a diagnostic report. The radiographers responsible for the examination undertake special training in MRI scanning. MRI is now routinely performed particularly for imaging the head, spine and spinal cord, muscles, joints and bones. Our radiographers and radiologist are happy to answer any questions you may have.
Advantages of MRI
By using magnetism instead of X-Rays, MRI avoids exposing patients to ionising radiation. The information in MRI can be obtained in any plane and is 3D. Magnetic Resonance Imaging provides more detailed information of the soft tissue structures of the body than has previously been possible. The images are not degraded by adjacent bone as with CT. It is the modality of choice for demonstrating many of the disease processes which involve the brain and spinal cord. MRI is able to demonstrate the anatomy of fine joint structures including muscles, ligaments and cartilage.
