MRI scan differ from a CT scan

         

       Since the initial discovery of x-ray by Wilhelm Conrad Roentgen on November 8, 1895, the field of radiology has experienced two major breakthroughs that have revolutionized how we look into the patient's body. The first, computed tomography (CT) came in the early 1970s. The second, magnetic resonance imaging (MRI) was initially introduced in the early 1980s.

       With an MRI scan it is possible to take pictures from almost every angle, whereas a CT scan only shows pictures horizontally. There is no ionizing radiation (X-rays) involved in producing an MRI scan. MRI scans are generally more detailed, too. The difference between normal and abnormal tissue is often clearer on the MRI scan than on the CT scan.

 
 

How is an MRI scan performed?

The scan is usually done as an outpatient procedure, which means that the patient can go home after the test. 
Since you are exposed to a powerful magnetic field during the MRI scan, it is important not to wear jewellery or any other metal objects. 
It is also important for the patient to inform medical staff if they use electrical appliances, such as a hearing aid or pacemaker, or have any metal in their body such as surgical clips, but orthopaedic metalware such as artificial hips or bone screws is not normally a problem.

 
 
           

san MRI scan dangerous?

There are no known dangers or side effects connected to an MRI scan. The test is not painful; you cannot feel it. Since radiation is not used, the procedure can be repeated without problems.

Because patients have to lie inside a large cylinder while the scans are being made some people get claustrophobic during the test. Patients who are afraid this might happen should talk to the doctor beforehand, who may give them some 

medication to help them relax. 
The machine also makes a banging noise while it is working, which might be unpleasant.