X-ray diagnostic installation with electronic zoom for a detector with a storage luminescent screen

An X-ray diagnostic installation comprising:

• an X-ray source which emits an X-ray beam;
• a storage luminescent screen for storing a latent X-ray image produced by irradiation of said storage luminescent screen by said X-ray beam;
• a readout system for reading out said latent X-ray image from said storage luminescent screen by scanning said storage luminescent screen with a radiation source, and thereby causing said storage luminescent screen to emit light;
• a detector for detecting said light emitted by said storage luminescent screen;
• an image playback system connected to said detector for converting light detected by said detector into signals for producing a visual, displayable image corresponding to said latent X-ray image;
• and
• a control unit, connected at least to said X-ray source and to said readout system, for operating said X-ray source and said readout system in a first mode wherein said X-ray source emits said X-ray beam with a first dose and wherein said readout system executes a rapid readout of said storage luminescent screen with low resolution to obtain a synoptic image, and in a second mode wherein said X-ray source produces said latent X-ray image in a selected limited region of said storage luminescent screen and with a higher dose relative to said first dose, and wherein said readout system executes a readout of said limited region of said storage luminescent screen with high resolution to obtain a zoom image of said selected limited region of said synoptic image.