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A Closer Look Into MRI Scanners Radiofrequency

Nov 30, 2020 | Articles, MRI

Magnetic resonance imaging (MRI) are machines that allow healthcare professionals to gain access to the human body, all without the need for scalpels and stitches. These machines can produce images of the human body in amazing detail, all with the help of radiofrequency. 

The first MRI scanner ever used was built in 1977 in New York, and the innovation has changed the course of medicine forever. Technology continues to make frequent changes in the MRI scanners, ensuring that it stays up to date and highly capable of saving lives. 

Without the use of harmful ionizing radiation, MRI is needed in various hospitals around the world, as it continues to diagnose the most complex of conditions, including cancer, heart conditions, and even stroke. 

Although undeniably valuable, most people still remain at loss as to how these machines work. A little knowledge goes a long way, so here’s a quick guide on MRI machines, radiofrequency, and its processes:


Digging Into The MRI: How Radiofrequency Works 

The MRI produces detailed images that show specific parts of the body. To do so, it makes use of powerful magnets that make the spins of protons align in a magnetic field. It also makes use of radiofrequency currents specific to hydrogen. The machine directs the radiofrequency pulses towards a certain area in a body, then the protons in that area absorb the energy in the pulses and begin to reverse their spins. 

The protons return to their original spin as the pulse is turned off, releasing excess energy in the return process. Receivers in the MRI then measure the radio pulses that are produced in this process, sending them to its computer system. Afterward, the data becomes converted into a detailed image. Interestingly, the machine can also distinguish between different parts of the body because the protons don’t return to their spins at the same rate.


The Anatomy of MRI

To capture images, MRIs make use of a certain process, which transmits the magnets and frequencies to collect one solid image. Here’s what’s included in the transmission: 

  • Frequency synthesizer: This part of the MRI produces a continuous wave, which is later received as a signal.
  • Pulse modulator: The pulse essentially chops up the signal into bite-sized pieces, effectively making it more manageable for MRI to manage the images to be later produced.
  • High power amplifier:  This one allows the signals to pass through the coils, and it’s a critical part of the MRI. This is where operators can ensure that the transmitter elements are working properly. 
  • Quadrature hybrid coupler: Here, the outputs are split into two parts, which are then used to feed other transmitter coils. 
  • Transmit/Receive, switch, and coil: Finally, the signals are received by the main coils, which are then regulated to ensure that no case of overheating happens. MRI machines come with sensitive circuits, so these parts are highly crucial. 


The Saving Power of MRIs

Although the science behind MRI scanners can be difficult to understand, researchers and manufacturers alike work tirelessly to ensure that these machines continue to save and care for lives. By harnessing the energy provided by renewable earth sources, doctors can continue providing patients with the utmost care. From everything said and done, we can gather one crucial fact: so long as technology flourishes, so will the medical field. 

If you wish to learn more about MRI parts and other details, DirectMed Parts offers you a plethora of information. We are the leading provider of everything medical imaging, including parts and services. Allow our professionals to help your hospitals flourish, be it through repairs, maintenance, and the installation of new machines. Reach out to us today to learn more!


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