Understanding Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) applies the human body natural magnetic properties to build full images from any part of a human body. Hydrogen nucleus is used for imaging purposes as a single proton due to its abundance in fat and water. Subjecting the human body into a strong magnetic field, for instance, MRI scanner triggers the entire proton axis lineup. To this end, the unified alignment forms a magnetic vector projected along the MRI scanner axis. Notably, MRI appears in unique field strengths normally between 0.5 and 1.5 teslas (Rietsch, 2019). Additional radio wave energy to the magnetic field deflects the magnetic vector. In this case, the radio wave frequency RF that triggers hydrogen nuclei resonating process is dependent on magnetic field strength and the hydrogen element. The magnetic field strength can be changed electronically in any part of the human body using gradient coils and through modifying the local magnetic field such that application of different frequencies resonates with different body parts due to these small increments (Lauterbur, 2019). Switching off the radio frequency triggers the magnetic vector to rest to its normal state, thus causing emission of a radio wave. This signal (radio wave) is used in the creation of MRI images.

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References

Rietsch, S. H. G. (2019). Development and Evaluation of Radio Frequency Antennas for 7 Tesla Ultrahigh-Field Magnetic Resonance Imaging (Doctoral dissertation, [Sl: sn]).

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Lauterbur, P. C. (2019). Paul Lauterbur and Sir Peter Mansfield for MRI. European Heart Journal, 40, 1898-1908.

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