1. A thermoacoustic tomograph for imaging an object, comprising: at least one excitation source configured to thermally excite the object; at least one large-area or integrating line detector for detecting acoustic waves caused by the object upon excitation thereof by said source, said at least one detector having a size chosen in dependence on a distance between said detector and a point of the object that is furthest away from said detector, wherein d denotes the distance between said detector and a point of the object that is furthest away from said detector, and wherein said detector has at least one dimension with an extent of at least √{square root over (8)}·d; a movement device for moving the object and/or the at least one detector relative to one another; and a device connected to said detector for reconstructing an image of the object from the acoustic waves detected by said detector in dependence on a respective position of the object.