The use of a laser sheet (or elliptical Gaussian beam) in measurement techniques is of growing interest. Some of these techniques take advantage of the wavefront curvature of such beams as in a dual-crylindrical wave system (DCW). Nevertheless, up to now, the analysis of the properties of the light scattered by spherical particles from the beam has been carried out largely by using geometrical optics or classical Lorenz-Mie theory. in this paper, the generalized Lorenz-Mie theory (GLMT) is applied to the analysis of an existing DCW measurement system. Differences between the results predicted by classical approaches and by GLMT are emphasized.