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What Are The Advantages And Disadvantages Of Magnetic Resonance Imaging (MRI)?

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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.
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Advantages:
1. It does not involve ionizing radiation and therefore does not involve the risks associated with X-ray and γ-ray imaging. As far as is known, there are no harmful effects of any kind. (this last statement assumes that sensible precautions are taken – MRI must most be used on patient who have artificial pacemakers for example)
2. There are many situations (e.g. producing images of the brain) in which its ability to distinguish different types of soft tissue is superior to that of CT scanning.
3. It is non-invasive

Disadvantages:
The major disadvantage is that of cost- MRI is the most expensive of the various imagining processes. High costs are involved both in purchasing the equipment and in running it. Furthermore, the signals that form the image are extremely weak and the cost of screening the scanner from extraneous signals adds significantly to the initial expenditure.
There are a number of other considerations. Careful attention must be given to the position of the scanner because the powerful magnetic field can have an adverse effect on nearby electronic equipment. Personnel need to take care that small metal objects, such as scissors etc, are not "sucked" into the magnet. If they were, they could cause serious damage to anyone who happened to be in the way.

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