We have developed a dedicated breast imager, which makes use of a pendulum geometry of the breast and of a combined imaging modality, namely CT and SPECT co-registration. The CT scanner is composed by a quasi-monochromatic source which produces a 28 keV-fan beam and a linear digital detection system. X-ray source and digital detector are assembled on a toroidal tomograph gantry with about 13 cm of circular field of view, The gantry also contains the SPECT acquisition system., composed by a detector made of CsI scintillating crystal matrices coupled to Hamamatsu position sensitive photomultipliers and lead collimators. The toroid rotates under computer control so as to acquire separated slices over an angle of 180 deg. Each X-ray and SPECT image is acquired and reconstructed by using a specifically developed software, that also allows the fusion of the morphological with the functional information. In this paper a description of the prototype and the preliminary results are presented. Images of various test phantoms have been acquired with both modalities and first images with the fusion technique are presented
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