Nondestructive measurement of the grid ratio using a single image.

Medical Physics
A S Pasciak, A Kyle Jones

Abstract

The antiscatter grid is an essential part of modern radiographic systems. Since the introduction of the antiscatter grid, however, there have been few methods proposed for acceptance testing and verification of manufacturer-supplied grid specifications. The grid ratio (r) is an important parameter describing the antiscatter grid because it affects many other grid quality metrics, such as the contrast improvement ratio (K), primary transmission (Tp), and scatter transmission (Ts). Also, the grid ratio in large part determines the primary clinical use of the grid. To this end, the authors present a technique for the nondestructive measurement of the grid ratio of antiscatter grids. They derived an equation that can be used to calculate the grid ratio from a single off-focus flat field image by exploiting the relationship between grid cutoff and off-focus distance. The calculation can be performed by hand or with included analysis software. They calculated the grid ratios of several different grids throughout the institution, and afterward they destructively measured the grid ratio of a nominal r8 grid previously evaluated with the method. They also studied the sensitivity of the method to technical factors and choice of parameter...Continue Reading

References

Nov 1, 1976·The British Journal of Radiology·R Birch
Sep 1, 1959·Acta Radiologica·J G BONENKAMP, W H GOLDINGH

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Citations

Jul 5, 2012·Medical Physics·Alexander W ScottGary T Barnes
Jan 11, 2013·The International Journal of Medical Robotics + Computer Assisted Surgery : MRCAS·Abed Malti, Joao Pedro Barreto

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