The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Modern small-animal SPECT systems use multiple pinhole apertures per detector to obtain high sensitivity while still maintaining high resolution. This resolution is a combination of aperture resolution combined with detector resolution, which is mitigated by magnification. Higher magnification results in better resolution, but fewer apertures per detector. When multiple apertures project onto the...
Recently, a square-pinhole collimator has been proposed for SPECT imaging since it can tile the projection onto the detector efficiently and the fields of view (FOVs) in transverse and axial directions become separable. In this work, we have conducted sensitivity and FOV experiments for eighteen fabricated platinum/iridium(Pt/Ir) inserts with sub-millimeter square-apertures. A sinqθ fit to the experimental...
Increasing the number of pinholes in small-animal SPECT significantly improves its count sensitivity. When the detector(s) are small, however, overlapping of projections (multiplexing) from different pinholes is unavoidable and can amplify noise in reconstructed images. We have evaluated the performance of two multi-pinhole systems, one with and one without multiplexing, for a prototypical tumor-imaging...
When evaluating small-animal imagers, small pointlike sources (<;1mm diam.) are useful for testing system performance. Slightly larger sources (1-3 mm) can also be used to mimic tumors. Ideal sources should have high uptake of TcO4-, and should not be damaged during preparation or handling. Various crystalline minerals are able to adsorb a variety of chemical species, and may satisfy these criteria...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.