Advantages:
1. MRI has no damage to the human body;
2. MRI can obtain three-dimensional images of the brain and spinal cord, unlike CT, layer by layer scanning and there is a possibility of missing the lesion site;
3. Diagnosis of heart lesions, CT due to the slow speed of scanning and difficult to perform;
4. bladder, rectum, uterus, Vagina, bones, joints, muscles and other parts of the examination is better than CT.
Disadvantages:
1. Like CT, MRI is also diagnostic imaging, and many lesions are still difficult to diagnose by MRI alone, unlike endoscopy, which can obtain diagnosis of both imaging and pathology at the same time;
2. Examination of lungs is not superior to X-ray or CT, and the examination of liver, pancreas, adrenal glands, prostate is not superior to CT, but it is much more expensive;
3. It is not as good as endoscopy for lesions in the gastrointestinal tract;
4. Those who have metal objects left in their bodies should not undergo MRI.
Precautions:
1. All metal-containing objects should be removed before the examination, such as metal watches, eyeglasses, necklaces, denture teeth, prosthetic eyes, buttons Belts, hearing aids, etc.;
2. Patients with pacemakers are prohibited from doing MRI;
3. When doing pelvic examination, the bladder needs to be full, and you should not relieve urination before the examination. There is a metal birth control ring must be removed to be carried out;
4. The body has shrapnel residue, generally can not do MRI;
5. Surgery left after the metal silver clip patients, whether to do the MRI examination to the doctor to carefully decide;
6. Thoracic and abdominal examination, to keep breathing steadily, avoid coughing during the examination or swallowing action;
7. MRI has no special requirements for diet and medication;
8. Bring other examination materials that have already been done, such as reports of ultrasound, X-ray, and CT, to the examination.
CT radiation is very small.CT machine belongs to the radiation examination machine, so CT examination has some radioactive damage to the human body. However, the radiation received in each examination is only slightly higher than the general X-ray examination, generally does not cause radiation damage, but blind multiple CT examination is not beneficial or even harmful.
These two kinds of are not will not have great harm to the human body but must never often do the examination
As for that better look at what I said above the advantages of nuclear magnetic **** vibration you will know