A tomosynthetic image taking apparatus takes an x-ray image of an object
in each of a plurality of positions of an x-ray source to obtain a
desired tomogram of the object by adding up the x-ray images thus
obtained. A heartbeat phase is detected and the tomosynthetic image
taking apparatus is controlled to take an x-ray image of the object in
each of the plurality of positions of the x-ray source when the heartbeat
of the object is in the same heartbeat phase.