Brain resonance is primarily used when a structural brain injury is suspected, that is, a problem that we can "photograph."
As in all the complementary tests, the information it offers is of no value if the context of symptoms and signs of the patient that the neurosurgeon will have obtained during the medical visit and with which he will develop a diagnostic hypothesis is not taken into account.
It is essential in the study of pathologies that occur with alterations in brain structure such as childhood cerebral palsy, malformations, or the consequences of trauma or infection, among others.
It is also used in the study of some types of epilepsy, to ensure that there is no underlying cause. And very rarely before a headache.
For the study of vascular diseases, tumours, neurodegenerative processes, and prior to brain surgery, the MRI images are combined with other special resonance techniques:
Provides information on brain metabolism
- Diffusion: study the microscopic molecular movement
- Perfusion: allows to see cerebral blood flow
Visualize, after contrast injection, arteries, and veins
To see the structure of brain fibers
- Functional MRI:
The image is obtained while the patient performs a task and their brain activity is studied
How is a resonance made?
Unlike other imaging techniques, such as simple radiology or CT, magnetic resonance imaging does not use radiation (X-rays), but rather very strong magnets and radio waves that have no side effects. This makes resonance, along with ultrasound, the safest and safest procedure to obtain body images.
The waves pass through the tissue to be studied, finding different resistance depending on the amount of water it contains. Thus, the device produces a very reliable and accurate map of the studied area much sharper than that obtained by other techniques.
The strong magnetic fields that are created during an MRI force to remove all metal objects from the room. Even smaller objects cause interference by vibrating under the force of the magnet, resulting in blurry images without utility, large objects can fly away, causing accidents. Before having an MRI, one should know the MRI test cost in Noida.
That is why the patient should take off his clothes and put on a hospital gown before laying him on the narrow stretcher that slides inside the resonance tube. To better visualize the images, contrast is sometimes given to the patient through an intravenous line. The most widely used is gadolinium, which is very safe and rarely causes side effects - nausea and local pain - and very rarely allergic reactions. It is contraindicated in patients with severe kidney problems.
The time required to obtain the images is very long, about 30 minutes minimum - depending on the surface to be studied, and the patient must be absolutely still so that they do not get blurred. In addition, the intense noise of the device prevents spontaneous sleep. Children under 6 years of age and children with difficulties to collaborate need to be sedated so that the MRI obtains clear images. Sedation will be done by MRI test labs in Delhi who will be present throughout the examination.