Hand mit Ringen (First medical X-ray by Wilhelm Röntgen of his wife Anna Bertha Ludwig's hand). By Wilhelm Röntgen. ([1]) [Public domain], via Wikimedia Commons

https://commons.wikimedia.org/wiki/File:First_medical_X-ray_by_Wilhelm_R%C3%B6ntgen_of_his_wife_Anna_Bertha_Ludwig%27s_hand_-_18951222.jpg