How does an MRI work?

Brain is the part of our body which is controlling all the functions of our body and therefore if there is any kind of problem with this part of our body our body would not be able to function properly and that is where brain scanning is needed but brain scanning is actually a very complex thing and it is not easy at all. From time to time, doctors might need the brain scanning of a certain patient depending on the element which the patient is suffering from and that is when these brain scanning technologies come into the picture. Fortunately, there has been a very successful brain scanning technology which is being developed known as MRI.

MRI stands for magnetic resonance imaging. This technique is actually very popular because of the effectiveness in scanning the various parts of the brain and providing a clear picture to the doctor. This type of scanning is used for detecting any kind of injury to the brain or any malfunction in the brain or if any part of the brain is not responding to the functions properly. This technology has been used for quite a few years to detect a lot of problems. An MRI tube is as old as three decades but still most of the people are afraid of MRI scans thinking that it is something very risky but the working of the MRI tube is actually not risky at all and in fact it helps us in detecting a lot of risky elements and health conditions.

If you have seen an MRI tube then you would be overwhelmed by the size of the MRI to, the patient is to rest on the stretcher in the stretcher is pulled entirely inside the MRI tube and you had to remove any metallic or magnetic objects before going into the MRI machine. The magnetic objects or the metallic objects are remote because the MRI tube’s use of a magnetic field generated by a very powerful magnets and that is the reason that the magnetic of the metallic objects would be interfering with this magnetic field and therefore the doctors might not be able to get an accurate scan as well and that is why you had to be devoid of all the magnetic or metallic objects before you go on to the MRI tube.

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The placement of the body of the patient is in such a manner that the part of the body which is to be scanned whether it is the brain or whether it is the chest of the patient or whether it is some other part of the patient needs to be placed exactly at the Centre of the tube in the MRI machine. This position coincides with the Centre between the magnets so that it consists of proper magnetic field and the scan can take place properly. The centre of the magnetic field ensures that the scanning is done in a proper way. The magnets which are used in the MRI machine are actually much more powerful than the normal magnets which we usually come across. To give you a perspective of the power of the magnets, you had to 1st understand that the normal natural magnetic field of the earth is 0.5 gauss and 10,000 gauss is equal to 1 Tesla and the magnetic field which is produced inside the MRI machine is 0.5 to 2.0 Tesla.

How does an MRI work?

mri scan machine

Now that we are familiar with the basic principle of the MRI machine loveletter is going to the greater details of the MRI machine to actually understand how does it work.

As you might already know, significant portion of our body is made up of water and water consist of nothing but hydrogen and oxygen molecules. The hydrogen molecules are specifically, have a natural magnetic spin as well and therefore when the body is placed inside the MRI due which consist of a very powerful magnet, the natural spin of the hydrogen molecules is altered with the help of the magnetic field of the powerful magnets and also with the help of the radio waves. A single radio burst cannot are the alignment of the hydrogen molecules in the body. With the help of another radio a burst the hydrogen molecules can be brought into their original spin. When the spin of the hydrogen molecule is changed with the help of the magnetic field as well as with the help of the radio a burst they start emitting radio waves and these radio waves are recorded by the MRI scanner.

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The turnaround time for the hydrogen molecules to come back into their original spin would always be directly dependent on the issue of the body which is being scanned because it will change from one tissue to another tissue. The time which it takes for the hydrogen molecules to get realigned would be taken into account by the computer and this would determine the type of tissues which a exist in that part of the body.

Detection with the help of MRI scans:

As we mentioned above, with the help of the MRI scanner the computer can detect the tissues which are contained in a certain part of the body and can detect other things like bones as well. It detects on the basis of the hydrogen content in the part of the body which is to be scanned and since bones do not have a lot of hydrogen content it is able to protect bones as well. The part of the body which does not have a lot of hydrogen content would appear as dark as compared to the part of the body which is that means only the tissues would appear brighter as compared to the bones and other parts of the body having more hydrogen content. That would mean that only the tissues in the body would appear brighter because they have more hydrogen content.

The scanning which is done by the MRI machine is done in a two-dimensional manner and therefore the doctor would have to look at the different layers of the area in which the scanning is to be done. Recent advancement in the technology also makes it possible to have a three-dimensional scan but it is not in widespread use yet. Another added feature of the MRI scanners is to take a look at the blood flow in the part of the body which is being scanned.

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MRI scan, which is a non-invasive technique has proven to be a boon for the doctors to map out the various parts of the body’s and the tissues in those parts of the body.