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Mammography Grid Performance

Paul S. Rezentes, PhD1, Adelaide de Almeida, PhD2 and Gary T. Barnes, PhD1

1 Department of Radiology, University of Alabama Hospital and Clinics, 619 S 19th St, Birmingham, AL 35233 (P.S.R., G.T.B.)
2 Faculty of Physical Sciences, Universidade de Sao Paulo, Campus de Ribeirao Preto, Brasil (A.d.A.).



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  		Figure 1. Graph shows MAM-CP grid contrast improvement factor and Bucky factor versus kilovolt peak level for 2-, 4-, and 8-cm breast phantom thicknesses.

 


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  		Figure 2a. Graphs show 600T grid (a) contrast improvement factor and (b) Bucky factor versus kilovolt peak level for 4- and 8-cm-thick phantoms. These graphs illustrate the effect of the nongrid technique on measured grid performance. In method 1, the nongrid phantom image is obtained by positioning the phantom directly on the screen-film cassette; in method 2, the phantom is positioned on the cassette tunnel.

 


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  		Figure 2b. Graphs show 600T grid (a) contrast improvement factor and (b) Bucky factor versus kilovolt peak level for 4- and 8-cm-thick phantoms. These graphs illustrate the effect of the nongrid technique on measured grid performance. In method 1, the nongrid phantom image is obtained by positioning the phantom directly on the screen-film cassette; in method 2, the phantom is positioned on the cassette tunnel.

 




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