1. A method for generating a 3-dimensional reconstruction model of an object of interest that lies within a volume, the method executed at least in part by a computer and comprising: acquiring a first set of projection images of the volume at a first exposure and having a first field of view; acquiring a second set of projection images of the object of interest within the volume at a second exposure that is higher than the first exposure and having a second field of view that is narrower than the first field of view; reconstructing the object of interest from the second set of projection images according to information from the first set of projection images related to portions of the volume that lie outside the object of interest; and displaying the reconstructed object of interest.