MRI Imaging and In-Phase Out-of-Phase Differences

Water has more protons bonded to a long chain of carbon framework compared to fat.

The shielding effect is stronger in water than in fat, causing the protons in water to experience a lower magnetic field.

At 1.5 Tesla, the resonance frequency of hydrogen molecules in water is approximately 64 MHz.

The resonance frequency of hydrogen molecules in fat at 1.5 Tesla is exactly 63.87 MHz.

The Larmor frequency of hydrogen in water at 3 Tesla is approximately 128 MHz.

Imaging parameters can be influenced by the small difference in resonance frequencies between water and fat protons.

At higher magnetic field strengths, the precession rates of fat and water protons become more similar.

In-phase and out-of-phase images are related to the phase period of chemical shift in MRI imaging.

Dixon Technique is used to obtain separate images of pure water and fat.

Clinical applications do not consider the differences in chemical shift between fat and water protons in MRI imaging.