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Standard line-by-line scanning method. A pencil beam illuminates a line through the object, stimulating emission of characteristic x-rays that are detected by an uncollimated, nonposition sensitive detector. The object must be translated and rotated in order to build up a sinogram. This figure is reprinted with permission from Meng et al., “X-ray fluorescence tomography using emission tomography systems,” IEEE Trans. Nucl. Sci. 58, 3359–3369 (2011). Copyright © 2011, IEEE.
