Bloch equations: MR signal basics

This lecture covers the Bloch equations, which describe the change in magnetization in MRI, by adding relaxation terms (T₁, T₂) to the fundamental equation of motion. It explains the basic MR signal, including free induction decay, precession, and relaxation. The lecture also discusses how T₁ changes can be measured through repetitive pulsing and multipulse experiments, emphasizing the impact of T₁ and T₂ relaxation on signal intensity. The summary highlights the equilibrium magnetization, the effect of T₁ and T₂ on image contrast, and the factors influencing the precession of transverse magnetization in MRI.