1. A computer tomography apparatus for examination of an object of interest ( 7 ), the computer tomography apparatus comprising: a source of radiation ( 4 ); a scatter radiation detector ( 30 , 34 ) for receiving a scatter radiation scattered by the object of interest ( 7 ); and a first collimator ( 60 ); wherein the fan plane extends through the object of interest and the source of radiation; wherein the scatter radiation detector has a plurality of regions; wherein each of the regions has at least one first detector element; wherein the at least one first detector element is an energy resolving detector element; wherein the first collimator is adapted such that radiation impinging on the at least one first detector element of a respective region of the plurality of regions is substantially restricted to scatter radiation scattered from a predetermined section of the object of interest; and wherein the source of radiation is adapted such that a fan beam of radiation is applied to the object of interest in the fan plane.