Obtaining flat x-ray images from round objects

摘要

A technique to correct deficiencies in x-ray images of cylindrical or spherical objects that are a consequence of the geometry of the sample is derived, for both two-dimensional (2D) and iinescan imaging. The methods described involve the use of attenuators specifically shaped to equalize the x-ray absorption across the width of the sample, thus correcting the variation in pixel intensity caused by varying sample thickness. In the case of Iinescan imaging, the attenuator thickness is varied as the sample passes through the plane of the x-rays, either by rotation or linear actuation. For the 2D case, the technique is demonstrated in x-ray images of an apple, an orange, and a lime. For Iinescan imaging, the correction is applied to a plastic cylindersimulating a container such as a can or a jar.