1. A radiological imaging device, comprising means for emission of an X-ray beam, a means for receiving the X-ray beam after it has crossed an object to be studied, and means for calculation for controlling the means for emission and for processing data from the means for receiving, the object being capable of being placed between the means for receiving and a compression element, the compression element being capable of being removably fixed on the device, the means for calculation unit a means for optimizing the image quality over a particular area defined by the compression element.