A photothermographic material comprising at least a photosensitive silver halide, a reducible silver salt, a reducing compound represented by the following formula or, a binder and a coupler compound on the same side of a support: . One exemplary method embodiment includes producing an oscillating phase encoding gradient during a readout phase, where the gradient facilitates acquiring data from multiple phase encoding lines during a single readout phase. The above objects are achievable by using as the hydroxide mineral 40 at least one hydroxide mineral selected from the group consisting of Mg2, Ca2, Al3, AlO, Fe3 and FeO, and as the organic compound 13 a saccharide having 4 to 40 carbon atoms. The terminal control unit is provided with a memory and a rewriting arrangement connected to the memory.