A system and a method are for quantifying blood loss on the basis of contrast-agent based computed tomography imaging of the torso of a patient. To this end, image data of a computed tomograph is firstly read in, in order thereupon to apply an image analysis method for automatically detecting accumulations of blood. A differentiation method is then carried out to differentiate between pathological and physiological accumulations of blood and a quantification algorithm for calculating and outputting a blood loss value for the pathological accumulations of blood.
