20 April 2005 Four-arm variable-resolution x-ray detector for CT target imaging
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The basic VRX technique boosts spatial resolution of a CT scanner in the scan plane by two or more orders of magnitude by reducing the angle of incidence of the x-ray beam with respect to the detector surface. A four-arm Variable-Resolution X-ray (VRX) detector has been developed for CT scanning. The detector allows for "target imaging" in which an area of interest is scanned at higher resolution than the remainder of the subject, yielding even higher resolution for the focal area than that obtained from the basic VRX technique. The new VRX-CT detector comprises four quasi-identical arms each containing six 24-cell modules (576 cells total). The modules are made of individual custom CdWO4 scintillators optically-coupled to custom photodiode arrays. The maximum scan field is 40 cm for a magnification of 1.4. A significant advantage of the four-arm geometry is that it can transform quickly to the two-arm, or even the single-arm geometry, for comparison studies. These simpler geometries have already been shown experimentally to yield in-plane CT detector resolution exceeding 60 cy/mm (<8μ) for small fields of view. Geometrical size and resolution limits of the target VRX field are calculated. Two-arm VRX-CT data are used to simulate and establish the feasibility of VRX CT target imaging. A prototype target VRX-CT scanner has been built and is undergoing initial testing.
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Frank A. DiBianca, Frank A. DiBianca, Daya Gulabani, Daya Gulabani, Lawrence M. Jordan, Lawrence M. Jordan, Sravanthi Vangala, Sravanthi Vangala, David Rendon, David Rendon, Joseph S. Laughter, Joseph S. Laughter, Roman Melnyk, Roman Melnyk, M. Waleed Gaber, M. Waleed Gaber, Gary S. Keyes, Gary S. Keyes, } "Four-arm variable-resolution x-ray detector for CT target imaging", Proc. SPIE 5745, Medical Imaging 2005: Physics of Medical Imaging, (20 April 2005); doi: 10.1117/12.594102; https://doi.org/10.1117/12.594102


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