Advantages of MRI 1. No Ionizing Radiation :RF pulses used in MRI do not cause ionization and have no harmful effects of ionizing radiation. Hence can be used in child bearing ladies and children. 2. Non-invasive: MRI is non-invasive. 3. Contrast resolution: It is the Principle advantage of MRI,i.e. Ability of an image process to distinguish adjacent soft tissue from one another.It can manipulate the contrast between different tissues by altering the pattern of RF pulses. 4. Not image: With MRI ,we can obtain direct,not,coronal and oblique image which is impossible with radiography and CT. 5. It could differentiate between acute and chronic transit and fibrous phases parallel with not changes. 6. Absence of significant artifact associated with dental filling. 7. No adverse effect has yet been demonstrated. 8. Image manipulation can be done. DISADVANTAGES OF MRI: 1. Claustrophobia i.e. Morbid fear of closed places because the patient is within the large magnet up to one hour. 2. MRI equipment is expensive to purchase, maintain, and operate. Hardware and software are still being developed. 3. Because of the strong magnetic field used in patient electrically,magnetically or mechanically activated implants such as cardiac pacemakers ,implantable defibrillators and some artificial heart valves may not be able to have MRI safely. 4. The MRI image becomes distorted by metal, so the image is distorted in patients with surgical clips or not, for instance. 5. 6. Bone dose not give MR signal ,a signal is obtained only from the bone marrow. 7. Long scanning time and requires patients co-operation. 8. The very powerful magnets can pose problems with sitting of equipment although shielding is now becoming more sophisticated. 9. MRI scanners are noisy. 10. Patient could develop an allergic reaction to the contrasting agent, or that a skin infection could develop at the site of injection. 11. MRI cannot always distinguish between malignant tumors or benign disease, which could lead to a false positive result.
