Abstract: The invention relates to an apparatus for the digital subtraction angiography in the energy subtraction mode, in which simultaneously two images with monochromatic X-radiation are recorded. One image is recorded with a monochromatic X-ray of energy E.sub.1 and a second image with a further monochromatic X-ray E.sub.2. The X-rays are converted into visible light by a scintillator (2). This light is recorded in linear manner in a detector (3). A computer subtracts the images obtained in linear manner in this way, so that an image can be produced, which clearly reproduces an organ or its vessels if the same is previously filled with an iodine contrasting agent. It is merely necessary for the energy of ray E.sub.1 to be just below and that of the other ray E.sub.2 just above the iodine absorption edge of 33 keV.