The design and calculation of four-section nuclear magnetic resonance (NMR) probe with improved radiofrequency field homogeneity is described. The probe is designed to operate in low-frequency (300 kHz) mini-scanner using magnetization transfer. Homogeneity improvement is achieved by optimization of turns’ distribution in sections. Optimization is made using the method of Lagrange undetermined multipliers. RF spin echo experiment showed a significant attenuation of spurious NMR signal after the inversion pulse when a sectioned probe is used. It confirms effectiveness of the applied approach to improve the quality of radiofrequency
field.