S-parameter in MRI: scattering parameters explained

S-parameters describe the electrical scattering properties of MRI radiofrequency (RF) components, quantifying transmitted, reflected, and coupled energy to optimize coil tuning and safety.

• S-parameters (scattering parameters) characterize how RF energy behaves in multi-port networks like MRI coils.
• Key S-parameters: S11 (input reflection), S21 (forward transmission), S12 (reverse transmission), S22 (output reflection).
• Primarily an educational physics concept useful for understanding coil design, impedance matching, and RF safety.

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