Mammography Grid Performance
- 1 January 1999
- journal article
- Published by Radiological Society of North America (RSNA) in Radiology
- Vol. 210 (1), 227-232
- https://doi.org/10.1148/radiology.210.1.r99dc35227
Abstract
To measure directly the grid performance of mammography units for the range of breast thicknesses and x-ray tube potentials encountered in clinical practice. Contrast improvement factors and Bucky factors were determined for four mammographic units as a function of x-ray tube potential (25, 30, and 35 kVp), phantom thickness (2, 4, and 8 cm) and, on one unit, three target-filter combinations. Three units used a linear grid; one, a cellular grid. Two methods were used for nongrid measurements. For all units tested, contrast improvement factor increased with increased phantom thickness and with increased kilovolt peak level for the 8-cm-thick phantom and changed little with kilovolt peak level for 2- and 4-cm-thick phantoms. At 25 and 30 kVp, contrast improvement factor performance with the linear grids was comparable; with the cellular grid, it was 5%-10% higher. In all cases, the Bucky factor increased with increased phantom thickness and decreased with increased tube potential. Differences in grid performance exist. At 25 and 30 kVp, the cellular grid exhibited superior contrast improvement factor performance, whereas one of the linear grids exhibited superior Bucky factor performance. Measured contrast improvement and Bucky factors are dependent on nongrid technique. Cassette tunnels introduce scatter and should not be used with nongrid or magnification techniques.Keywords
This publication has 10 references indexed in Scilit:
- Contrast and dose with Mo-Mo, Mo-Rh, and Rh-Rh target-filter combinations in mammography.Radiology, 1995
- Calculation of dose and contrast for two mammographic gridsPhysics in Medicine & Biology, 1992
- High-contrast mammography with a moving grid: assessment of clinical utilityAmerican Journal of Roentgenology, 1986
- Mammography using an ultrahigh-strip-density, stationary, focused grid.Radiology, 1985
- Ultra-high-strip-density radiographic grids: a new antiscatter technique for mammography.Radiology, 1985
- Physical and clinical evaluation of new high-strip-density radiographic grids.Radiology, 1983
- Grids in mammography.Radiology, 1983
- Investigation of the performance of antiscatter grids: Monte Carlo simulation studiesPhysics in Medicine & Biology, 1982
- The Intensity of Scattered Radiation in MammographyRadiology, 1978
- Der Einfluß der Streustrahlung auf die Abbildungsqualität bei der MammographieRöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren, 1975