| CPC G06T 15/08 (2013.01) [G06T 7/0012 (2013.01); G06T 2207/10076 (2013.01)] | 2 Claims |
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1. A method of producing a tomogram, the method comprising the steps of:
providing an x-ray detector panel comprising a plurality of pixels;
providing an x-ray emitter panel spaced from the x-ray detector panel, the emitter panel comprising a plurality of x-ray emitters;
identifying relative locations of the emitters and pixels relative to each other;
emitting a respective cone of x-ray radiation from each emitter toward the detector panel;
producing respective attenuation images at the detector panel in response to each respective cone of x-ray radiation impinging the detector panel; and
reconstructing a density function indicative of attenuation of the x-ray radiation by:
selecting a reconstruction slice corresponding to a plane located between the detector and emitter panels;
providing an array of grid cells on the reconstruction slice;
in response to selecting the reconstruction slice: for each respective attenuation image, back-projecting each pixel in the respective attenuation image back towards the respective emitter for that attenuation image onto the reconstruction slice and determining a proportion of overlap of that back-projected pixel with each grid cell to obtain a plurality of weighting factors comprising a respective weighting factor for each grid cell for that back-projected pixel;
using the plurality of weighting factors for each back-projected pixel in each attenuation image to calculate an average back-projected intensity for each grid cell in the selected reconstruction slice to produce an average intensity image for the selected reconstruction slice; and
convolving the average intensity image with a ramp filter to obtain the density function within the selected reconstruction slice.
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