Abstract: The invention relates to a test body for checking the transmission properties of volume tomographs, in particular radiological tomographs, which comprises several plates (2) that are connected to form a stack, in which adjacent plates (2) contact each other and said body comprises spheres (4) made of at least one material that is different from the plates (2) and having different diameters, wherein the respective spheres (4) are arranged in and/or between at least some of the plates (2), and wherein on/in the test body, preferably in the stack, at least one rod-shaped hollow profile, in particular at least one pipe having a circular cross section, is arranged. The invention further relates to a method for checking the transmission properties of a tomograph using such a test body (1).