Question

Provide a, minimum, 250 word explanation of resonance and hot it applies to today's MRI (Magnetic Resonance Imaging) technnique used in medicine. Include example equations for solving for resonance in your explanation.

Must be a minimum of 250 words, explain resonance and MRI's, and include equations for thumbs up!... Thank you!

Answer 1

Magnetic resonance imaging (MRI) is a spectroscopic imaging technique used in medical settings to produce images of the inside of the human body. n MRI is based on the principles of nuclear magnetic resonance (NMR), which is a spectroscopic technique used to obtain microscopic chemical and physical data about molecules

The magnetic resonance imaging is accomplished through the absorption and emission of energy of the radio frequency (RF) range of the electromagnetic spectrum.

The Components: n A magnet which produces a very powerful uniform magnetic field. n Gradient Magnets which are much lower in strength. n Equipment to transmit radio frequency (RF). n A very powerful computer system, which translates the signals transmitted by the coils.

How Does It All Work? n Spin: n The atoms that compose the human body have a property known as spin (a fundamental property of all atoms in nature like mass or charge). n Spin can be thought of as a small magnetic field and can be given a + or – sign and a mathematical value of multiples of ½. n Components of an atom such as protons, electrons and neutrons all have spin.

When placed in a large magnetic field, hydrogen atoms have a strong tendency to align in the direction of the magnetic filed n Inside the bore of the scanner, the magnetic field runs down the center of the tube in which the patient is placed, so the hydrogen protons will line up in either the direction of the feet or the head. n The majority will cancel each other, but the net number of protons is sufficient to produce an image.

Larmor Equation ω0 = γβ0/ 2π MHz

The resonance equation shows that the resonance frequency ν of a spin is proportional to the magnetic field, Bo, it is experiencing. ν = γ Bo n Where γ is the gyromagnetic ratio. [the ratio of the magnetic moment of a spinning charged particle to its angular momentum]