Читать книгу Magnetic Resonance Microscopy - Группа авторов - Страница 36

The SNR is proportional to the transmit efficiency as follows [24]:

(2.9)

with H₀ the magnetic field amplitude induced in the sample by the probe and P_loss the total power losses. For ceramic probes working with the TE_01δ mode, the latter includes the ceramic resonator and the sample contributions. Assuming the magnetic field amplitude equal to that of a disk resonator in its center, weighted by the penalty coefficient τ, Equation 2.9 becomes:

The above equation can be simplified to:

(2.10)