Digital tomosynthesis is a form of limited angle tomography that produces sectional, or slice, images from a series of projection images acquired as the x-ray tube moves over a prescribed path around the patient. The total angular range of movement is often less than 40°. Because the projection images are not acquired over a full 360° rotation about the patient, the resolution in the z direction (i.e., in the depth direction perpendicular to the x–y plane of the projection images) is limited. Therefore, tomosynthesis does not produce the isotropic spatial resolution achievable with computed tomography (CT). However, the resolution of images in the x–y plane of the reconstructed slices is often superior to CT, and its ease of use in conjunction with conventional radiography makes tomosynthesis a potentially very useful imaging modality.

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