The invention relates to a diagnosis device which is proposed for combined or combinable radiographic and nuclear medical examinations comprising: an x-ray source, an examination room for accommodating a patient, a gamma radiation source arranged in the body of the patient, a detector system which has a detector surface for simultaneously measuring the x-ray and gamma radiation without changing the patient's position or which is designed to record a two-dimensional locally-resolved and object-imaging individual x-ray projection image. The diagnosis device is designed to carry out the radiographic examination by evaluating the measurement of the x-rays and to carry out a single photon emission examination as a nuclear medical examination by evaluating the gamma radiation.