Current and future applications of magnetic resonance imaging and spectroscopy of the brain in hepatic encephalopathy

Figure 2 Model demonstrating the concepts underlying the phenomenon of magnetization transfer. The free pool of protons (A) resonates at the Larmor frequency (ν₀) and has a narrow spectral line. It is excited by an RF pulse which covers the frequencies shown in pink. The “bound” pool of protons (B) has a broad spectral line and can be excited and saturated by the application of RF irradiation at a frequency offset by Δν, shown in blue, without significantly affecting pool A.