How does a MRI work | How the magnetic ratio in MRI work?



MRI has brought a new revolution in the medical world. Since its discovery, doctors and researchers have improved the techniques of using it, (How does a MRI work) which has greatly helped in medical procedures and related discoveries. 

The full name of the MRI scan is ‘Magnetic Resonance Imaging’. For this scan, powerful magnets, radio rays and computers are used, with the help of which the information of the body is obtained through detailed photographs. 

Doctors may use this test to perform a physical examination of the patient or to see how the patient is responding to treatment. Radiation is not used in MRI scans like X-ray and CT scan tests. 



MRI is used in this physiological condition 

MRI scans can be used to examine almost every part of the body, including. 

  • Brain and spinal cord examination 
  • Heart and blood vessels examination
  • Breast examination
  • Examination of bones and joints
  • Examination of other internal organs like liver, uterus and prostate etc. 


How does a MRI work 

Nuclear magnetic resonance refers to the resonance phenomenon of electron nuclei excited by electromagnetic waves in a stationary magnetic field. This includes professional fields such as magnetic moment, spin angular momentum, lattice relaxation, pulse and diffusion coefficient. Its difficult to understand. Comparing it to a basin of water, it is not difficult to find that its principle is quite simple. 

Magnetic resonance imaging uses the principle of a magnetic field to change the direction of rotation of the hydrogen atoms in the device body. The nucleus will release the absorbed energy. 


How does a MRI work, How does an MRI machine work

How does an MRI machine work 

After the energy is excited, electromagnetic wave signals will be emitted, which are then combined through computer analysis into an image, (How does a MRI work) which is the commonly seen MRI image. The principle of magnetic resonance imaging is to place the human body in a magnetic field and use radio wave pulses to alter the regional magnetic field and stimulate the resonance of hydrogen nuclei in human tissues. 

Different tissues of the human body will generate different magnetic moment change signals, which are then processed by the computer. It can show a cross-sectional image of human tissue. For the magnetic field strength of MR imaging, it is expressed in tesla magnetic force units. 


How the magnetic ratio in MRI work?

The human body is an organism filled with water. The diffusion of water molecules is a random motion in three-dimensional space, which will change the speed of motion due to the influence of the surrounding environment. If you think of a human body as a basin of water and slap the outer edge of the basin hard, the water inside will cause ripples. If you put a finger of water in it, the original concentrated waves will be destroyed. 

By the same principle, water molecules in the human body contain many hydrogen nuclei, and these hydrogen nuclei themselves have magnetic field characteristics, like a small magnet. MRI scan is to place the human body in a strong and uniform static magnetic field, and then uses specific radio frequency radio wave pulses to excite hydrogen nuclei in human tissues. 

MRI is not invasive to the human body, does not produce ionizing radiation, can scan in multiple directions, provides three-dimensional images, and has high-contrast resolution. It is an indispensable diagnostic tool for modern medicine. It also has an advantage that no matter how many times it is used, it will not harm patients like traditional screening methods like X-rays. 


(How does a MRI work, How does an MRI machine work) 


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