These results demonstrate the potential of this kind of optimal convergent collimators for the use in small field of view imaging applications.

This paper presents an initial study towards the development of a multimodal breast imaging technique that combines Positron Emission Mammography (PEM) and Ultra WideBand (UWB) radar which has the potential to be complementary in breast cancer detection and classification due to the different types of information provided by the two modalities. The first step in evaluating test the potential of the multimodal PEM-UWB technique is to develop realistic numerical breast and tumour models, which can simultaneously be used for both PEM and UWB.

In SPECT the collimator optimization is crucial to obtain a maximized sensitivity for a fixed resolution. In this work we present one approach to optimize convergent collimators for pix elated imaging systems.An optimization algorithm was developed and used to optimize a matched fan beam collimator to image the entire breast and chest wall region. The range of input parameters used to calculate the optimal collimator dimensions was defined using data from patient studies for dual-head scintimammography systems.Results showed that the optimal fan beam collimator thickness is approximately constant from the center to the edge, as well the hole diameter and the septal thickness in both directions.Designed optimal collimators for pixelated breast imaging systems have an increased sensitivity for the upper holes, allowing a good detection in the chest wall region.

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