[en] Small-angle X-ray scattering has been used to characterize the Phospholipid Transport Nanosystem (PTNS) at the PTNS concentrations in water of 25%, 31.25%, and 37.5%. The vesicle's average radius, size polydispersity, bilayer thickness, and internal structure were evaluated from the experiment via applications of two models for the photon scattering density distribution. Two independent methods were used for the calculation of the SAXS spectra: the form factor of the heterogeneous spherical shell and the method of separated form factors. Two methods of the spectra calculation and two models for the approximation of the photon scattering length density evaluation provide coincident results, which demonstrate the decrease in the vesicle radius, thickness of the bilayer, and thickness of the hydrocarbon chains region at the increase in the maltose concentration in water.