EXPOSURE CONTROL IN SCANNING-BASED DETECTION OF IONIZING RADIATION

摘要

An apparatus for recording a 2D image of an object comprises a plurality of 1D detector units (41), each exposed to ionizing radiation, as transmitted through or scattered off the object, and being arranged for 1D imaging of the radiation, to which it is exposed. The detector units are distributed in a dense array such that the 1D images of the radiation from the detector units are distributed over a substantial portion of the 2D image. The apparatus includes a device (87-89, 91) for moving the detector units relative the object while the detector units repeatedly detect to create the 2D image of the object; and a control device for (i) controlling the detector units to detect ionizing radiation during a short period of time before or during an initial part of the movement, (ii) calculating an optimum exposure time for the repeated detection based on the short period of time detection, and (iii) controlling the repeated detection to automatically obtain the optimum exposure time.