The present invention relates to mobile imaging. In order to provide a mobile medical imaging system (100) with improved positioning characteristics, A positioning arrangement (126) is provided. The positioning arrangement comprises at least one positioning sensor (128). The at least one positioning sensor determines a current distance between a mobile structure of a mobile medical imaging system and at least one object in an environment of the mobile medical imaging system. The at least one positioning sensor operates in a first mode if a current distance is greater than a predetermined threshold, and/or in a second mode, if the current distance is smaller than the predetermined threshold. In the first mode, the at least one positioning sensor operates at a first spatial resolution, and, in the second mode, the at least one positioning sensor operates at a second spatial resolution, which second spatial resolution differs from the first spatial resolution.