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where 5: is the distance from the focal spot FS to the object, 52 is the distance from the focal spot FS to the input phosphor, R is the radius of the input phosphor curvature, and da is the d0 distance projected onto the input phosphor, which can be measured from the input (uncorrected) image.

For a 0 view angle, Eqs. (21) and (15) are equivalent.

Pixel Coordinate Correction

Once the pixel distance from the central point of the input image has been determined, the correction of the pixel coordinate may be performed. It is again performed with respect to the image center, which is unchanged. All other points are shifted along the radius toward the image center. Figure 14 shows the correction function performed on a grid

FIGURE 13 Geometrical distortions caused by a projection under an arbitrary view angle.
0 0

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