| http://www.w3.org/ns/prov#value | - velocity function v(x) is the velocity of the grid when the center of the anti-scatter grid is at position x, g(x) is an arbitrary function with a finite integral over x and has zero value outside a finite domain of x, h(x) is non-negative for every value of x, R(x) is the rect function, n is a positive integer, and P is the grid pitch. 2.
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