Systems, devices, methods, and computer-readable media relating to determining basic probability numbers for use within data fusion are disclosed. A method of defining a basic probability number may comprise measuring an intensity of a pixel of a radiograph wherein the pixel is associated with an interrogation space of an interrogation volume. The method may also include calculating an assumed intensity of the pixel for each possible configuration of a plurality of possible configurations for the interrogation space. Further, the method may include classifying each possible configuration as a possible target configuration if the measured intensity is within an error-factor of the assumed intensity. The method may further include defining a basic probability number of the pixel as a ratio of a number of possible target configurations to a number of possible configurations.
 This invention was made with government support under Contract No. DE-AC07-051D14517 awarded by the United States Department of Energy. The government has certain rights in the invention.