1. A method of reconstructing a three-dimensional information about the structure of an object within a volume of interest from projection images acquired by a digital tomosynthesis system having an x-ray source configured to emit x-rays from different positions relative to a detector and said volume of interest, said method comprising: acquiring projection images of said volume of interest; preparing new images by processing said projection images, wherein said processing comprises preparing a filtered version of at least one of said projection images; and backprojecting said new images.