MRI ஸ்கேன் பரிசோதனை தெரிந்து கொள்வோம் - MRI Scan Procedure

MRI Scan - Uses and Procedure

MRI scan uses a strong magnetic field and radio waves to generate images of parts of 

the body that can't be seen as well with X-rays, CT scans or ultrasound.

The human body is mostly water. Water molecules (H2O) contain hydrogen nuclei (protons), 

which become aligned in a magnetic field. An MRI scanner applies a very strong magnetic field 

(about 0.2 to 3 teslas, or roughly a thousand times the strength of a typical fridge magnet), 

which aligns the proton "spins."

The scanner also produces a radio frequency current that creates a varying magnetic field. 

The protons absorb the energy from the magnetic field and flip their spins. When the field is turned off, the protons gradually return to their normal spin, a process called precession. 

The return process produces a radio signal that can be measured by receivers 

in the scanner and made into an image.Protons in different body tissues return to their normal spins at different rates, so the scanner can distinguish among various types of tissue. The scanner settings 

can be adjusted to produce contrasts between different body tissues. Additional magnetic fields 

are used to produce 3-dimensional images that may be viewed from different angles.