![]() Radiology 147(2):575–582Ĭhan HP, Higashida Y, Doi K (1985) Performance of antiscatter grids in diagnostic radiology: experimental measurements and Monte Carlo simulation studies. Our results suggested that the image improvement factor is a useful index for selecting grids according to object thickness at a constant exposure in DR systems.ĭoi K, Frank PH, Chan HP, Vyborny CJ, Makino S, Iida N, Carlin M (1983) Physical and clinical evaluation of new high-strip-density radiographic grids. The change in the image improvement factor of the simulated cervical spine with respect to the grid was smaller than those of the simulated pelvis and lumbar spine. At a constant grid ratio, these three parameters exhibited higher values at lower strip frequency (40 cm −1) than at higher strip frequency (60 cm −1). The grid selectivity, contrast improvement ratio, and grid exposure factor increased with higher grid ratios. Eight grids (four at 40 cm −1 strip frequency with grid ratios of 6:1, 8:1, 10:1, and 12:1, and four at 60 cm −1 strip frequency with grid ratios of 8:1, 10:1, 12:1, and 14:1) were used in this study. Applied irradiation fields were adjusted according to the simulated body parts. Various grids and acrylic phantoms of thicknesses 20 cm and 12 cm were used in this evaluation to simulate the pelvis and lumbar spine, and the cervical spine, respectively. This study effectively evaluates the image improvement factor and the conventional physical imaging properties, such as grid selectivity, contrast improvement ratio, and grid exposure factor.
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