The invention discloses a tomography device and a method for large volume 3D scans. According to the invention, a tomography device with a beam source (Q) and a detector (RD) that is adapted to carry out a scan. While the beam source (Q) is guided along a circular or helical first trajectory (BK1Q) about an orbital axis (OA), a rectangular sensor surface (SF) of the detector (RD) is guided at a distance (SID) from the beam source (Q) along a circular or helical second trajectory (BK2S) about the orbital axis (OA). During the scan, a yaw angle (GW) between a perpendicular bisector (MS) of the sensor surface (SF) and the plane (RE) of rotation in which the beam source (Q) is currently located has a value of greater than 0 degree and simultaneously smaller than 90 degrees. More, the invention relates to a corresponding method (100) for acquiring projection data.