1. Medical tomosynthesis system ( 10 ) comprising: an interventional device ( 15 ) for intervening into a subject volume; an image acquisition device ( 11 , 12 ) for acquiring images of the subject volume in a plurality of angular positions around the subject volume; geometric data means ( 21 ) for providing geometric data of the interventional device ( 15 ); and a processor ( 18 ) for determining, depending on the geometric data received from the geometric data means ( 21 ), a plurality of angular positions at which the image acquisition device ( 11 , 12 ) is allowed to acquire images.