It possesses the aptitude to differentiate better than any other radiology test the different anatomical structures. Contrasts can be added paramagnéticos like the gadolinio to delimit even more structures and parts of the body.

The securing of the images is obtained by means of the stimulation of the organism to the action of an electromagnetic field with a magnet of 1,5 Tesla (equivalent to 15 thousand times the magnetic field of the ground). This magnet attracts to the protons that are contained in the atoms of the textiles, which will line up with the magnetic field.

When the pulse is interrupted, the protons return to his original relaxation position, liberating energy and expressing signs of radio that are received by a recipient and analyzed by a computer that will transform them into images (every textile produces a different sign).

The patient remains knocked down in a stretcher, and this one slides inside the pipe that generates the magnetic fields. The device generates magnetic fields about the patient and expresses waves of radio that they go to the textiles to study. But it is bloodless and not invasive for the patient.

The principal problem is the claustrophobia (feeling of being shut up), so much for being in a closed pipe as why the machine produces a lot of noise.

The stretcher can be cold, and lasts, a small pillow can be necessary.

• Affectation of the SNC: it provides major resolution than the TAC, especially in affectation of the white substance, later pit and trunk of the brain. It is used for the study of these structures affected by tumors, venous thromboses, you tackle of desmielinización (multiple sclerosis), cerebral infarctions, etc...
• Spinal cord affectation.
• Tumor: tumor alterations of any type and in any organ Cardiovascular: it is possible to study the heart as well as his circulation, the arteries, including the aorta and the different veins.
• Otolaryngology: illnesses of ears, bosoms, mouth and gullet System musculoesquelético: It is very useful for the diagnosis of muscular injuries, you will articulate and ligamentosas.

The patient will be knocked down in a stretcher that moves ahead and backwards. The pipe of the RMN has a cylindrical opening in his center that is where the patient will remain introduced. Some models are opened to avoid the claustrophobia.

According to the potency of the device the exploration will last from a few minutes up to approximately 30-45 mn.

During the same one, an intense noise is heard in the shape of pulses, which are produced by the magnetic field. This noise weakens by means of a few protective helmets.

The principal problems that can take place are the claustrophobia and that the noise turns out to be intolerable.

It is important that the patient is completely calm to obtain good images.

In some explorations it will be necessary to inject a contrast into a vein during the exploration.

In small children, it can be necessary to use sedation so that it is calm during the exploration. This sedation can be administered by mouth or by means of injection.

In the cases in which there should be necessary the use of endovenoso contrast or sedation one will ask him to sign a sheet of informed assent.

It is convenient that, before realizing it, it realizes his physiological needs not to want during the test.

If you are a bearer of some type of metallic implant or prosthesis in some textile or organ (for example, paper clips in cerebral glasses, stent coronary, prosthesis in knee or hip, cardiac metallic valves, etc...) must consult it previously to the test if it was not possible to realize, but almost all these implants are of materials not imantables that they allow to realize it.

A special case is the pregnancy. One usually tries to defer the resonance until it finishes, but if it is necessary it will make break of the first trimester.