Magnetic Resonance Imaging (MRI)

t

The process of signal generation and acquisition in magnetic resonance imaging consists of four stages.

1. The magnetic gradient along the

z

axis selects a slice of the object. The protons in this slice are excited by a radiofrequency pulse.

2. The magnetic gradient along the

y

axis achieves phase encoding of the protons in the selected slice.

3. The magnetic gradient along the

x

axis produces a frequency encoding.

4. The signals emitted by the protons are detected, and an image of the object is synthesized by a computer program.