What are the purposes and properties (magnitude, frequency, duration, and direction) of B0 and B1 in...

What are the purposes and properties (magnitude, frequency, duration, and direction) of B0 and B1 in MRI?

Solutions

Expert Solution

Any magnetization that is transverse (perpendicular) to an applied magnetic field B will precess around that B field at the Larmor frequency.

In MRI there are 3 kinds of magnetic fields:

1. B0 – the main magnetic field

2. B1 – an RF field that excites the spins

3. Gx, Gy, Gz – the gradient fields that

provide localization

Major steps in a 1D MRI experiment are

Object to be imaged is placed into the main field, B0. Subsequently, the object develops a distribution of magnetization, m0(x,y,z), that is to be imaged. This magnetization is aligned with B0 (in the z-direction).

2. Rotating RF magnetic field, B1, is applied to tip the magnetization into the plane that is transverse to B0. While in this plane, the magnetization precesses about the main field at afrequency proportional to the strength of the main field (ω = γB). This precessing magnetization creates a voltage in a receive coil, which is acquired for subsequent processing.

genius_generous answered 1 year ago

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