The present invention relates to a device for imaging a turbid medium (130, 132; 184) comprising: means (110; 134, 138, 140, 142, 144, 146) for optically scanning a predefined maximum area of a scanning plane (102; 104) for acquisition of imaging data, means (134, 136; 206, 208, 210) for detection of an outer contour of the turbid medium, means (112, 120, 122) for controlling the optical scanning such that a sub-area of the maximum area is scanned that is smaller than the maximum area and that covers the outer contour.