Limited angle dual modality breast imaging

We are developing a dual modality breast scanner that can obtain X-ray transmission and gamma ray emission images in succession at multiple viewing angles with the breast held under mild compression. These views are then reconstructed and fused to obtain three-dimensional images that combine structural and functional information. Here we describe the dual modality system and present results of phantom experiments designed to test the system's ability to obtain volumetric dual modality data sets from a limited number of projections, acquired over a limited (less than 180 degrees) angular range.