1. A medical imaging system for planning an implantation of a cardiac implant, comprising: a receiving unit for receiving a plurality of three-dimensional (3D) cardiac images showing different conditions of a heart during a cardiac cycle; a segmentation unit for segmenting within the plurality of 3D cardiac images a target implant region and a locally adjacent region that could interfere with the cardiac implant, wherein the target implant region is a part of a left ventricular outflow tract and the locally adjacent region is a part of a mitral valve; a simulation unit for simulating the implantation of the cardiac implant within the target implant region in at least two of the plurality of 3D cardiac images; a collision evaluation unit for evaluating an overlap of the simulated cardiac implant with the segmented locally adjacent region in at least two of the plurality of 3D cardiac images; and a feedback unit for providing feedback information to a user concerning the evaluated overlap.