The precessional frequency difference between water and fat at 1.5 Tesla is approximately how many Hz?

At a magnetic field strength of 1.5 Tesla, the precessional frequencies of protons in different tissues differ due to their chemical environment. Water and fat protons precess at slightly different frequencies because of their distinct magnetic susceptibility and resonance properties.

Specifically, the precessional frequency for protons in water is higher than that for protons in fat. At 1.5 Tesla, the commonly established difference in precessional frequency between water and fat is approximately 220 Hz. This difference is pivotal in various imaging techniques, such as Chemical Shift Imaging, which exploits the unique frequency differences to create contrast between various tissues in MRI.

The value of 220 Hz reflects the well-documented frequency shift that occurs, making it crucial for interpretation in various clinical settings. Understanding this frequency difference is fundamental for imaging professionals to make accurate assessments of tissue composition in MRI scans.