1. A detection device, comprising: a first detector; a second detector; an object holder; an object holder displacement device; a control device; and a selection device, wherein the first detector comprises a gamma detection space with a gamma camera having a first field-of-view that is located in the gamma detection space, the second detector comprises an additional camera that is substantially sensitive to radiation that differs from gamma radiation, and having a second field-of-view outside the gamma detection space, the control device comprises a screen, wherein the control device and the screen are configured to make a second image taken by the second detector and display the second image prior to taking and displaying a first image by the first detector, and the object holder displacement device is arranged to displace the object holder along a path that is controllable by the control device, and wherein the selection device is configured to select a part of an object to be examined to be detected by the first detector based on the second image prior to making the first image of the part of the object.