Magnetic resonance imaging (MRI) scans may be appropriate when precise detail about a tumor's location is required. The MRI technique uses magnetism, radio waves, and a computer to produce images of body structures. As with CT scanning, the patient is placed on a moveable bed which is inserted into the MRI scanner. There are no known side effects of MRI scanning, and there is no exposure to radiation. The image and resolution produced by MRI is quite detailed and can detect tiny changes of structures within the body. People with heart pacemakers, metal implants, artificial heart valves, and other surgically implanted structures cannot be scanned with an MRI because of the risk that the magnet may move the metal parts of these structures.
With this technique, detailed pictures of various organs are obtained using a magnetic field. It is painless, but may involve lying in a confined space for up to 30 minutes. The MRI is used for brain imaging when headache occurs as one of the symptoms. It may also be used to evaluate blood vessel or bone involvement of a lung tumour, when insufficient information is obtained from the CAT scan.
<Back
No comments:
Post a Comment