6 March 2013 Rectangular computed tomography using a stationary array of CNT emitters: initial experimental results
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Proceedings Volume 8668, Medical Imaging 2013: Physics of Medical Imaging; 86685K (2013) https://doi.org/10.1117/12.2008030
Event: SPIE Medical Imaging, 2013, Lake Buena Vista (Orlando Area), Florida, United States
Abstract
XinRay Systems Inc has a rectangular x-ray computed tomography (CT) imaging setup using multibeam x-ray tubes. These multibeam x-ray tubes are based on cold cathodes using carbon nanotube (CNT) field emitters. Due to their unique design, a CNT x-ray tube can contain a dense array of independently controlled electron emitters which generate a linear array of x-ray focal spots. XinRay uses a set of linear CNT x-ray tubes to design and construct a stationary CT setup which achieves sufficient CT coverage from a fixed set of views. The CT system has no moving gantry, enabling it to be enclosed in a compact rectangular tunnel. The fixed locations of the x-ray focal spots were optimized through simulations. The rectangular shape creates significant variation in path length from the focal spots to the detector for different x-ray views. The shape also results in unequal x-ray coverage in the imaged space. We discuss the impact of this variation on the reconstruction. XinRay uses an iterative reconstruction algorithm to account for this unique geometry, which is implemented on a graphics processing unit (GPU). The fixed focal spots prohibit the use of an antiscatter grid. Quantitative measure of the scatter and its impact on the reconstruction will be discussed. These results represent the first known implementation of a completely stationary CT setup using CNT x-ray emitter arrays.
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Brian Gonzales, Derrek Spronk, Yuan Cheng, Zheng Zhang, Xiaochuan Pan, Moritz Beckmann, Otto Zhou, Jianping Lu, "Rectangular computed tomography using a stationary array of CNT emitters: initial experimental results", Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86685K (6 March 2013); doi: 10.1117/12.2008030; https://doi.org/10.1117/12.2008030
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