X-ray diagnostic device and method for operating an X-ray diagnostic device for determining quality values

The invention relates to an angiographic X-ray diagnostic device - having an X-ray source (3) having an X-ray tube (5), - with a patient table having a radiolucent table top and mattress, - an X-ray image detector (4), - with an image system (12) and an image processing and - with a measuring device (13), the output signals of the X-ray image detector (4) are supplied and - a first device (31 to 34) for determining a playback quality of clinically relevant objects determining value, - a second device (39 to 41) for determining the local variance (V - a device (42, 43) for forming the ratio of the output values ​​of the two devices (31 to 34, 39 to 41). The invention further relates to a measuring method for verifying an X-ray diagnostic device and a measuring method for verifying of clinically relevant objects by means of a standard X-ray diagnostic device.