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Focused Grids

The use of a grid to eliminate scattered radiation is an important way of realising optimum
image quality. The CAWO full metal grids consist of a series of absorbent lead strips interspaced by aluminium strips. Primary radiation passes unhindered between the lead strips, while the scattered radiation is absorbed by the lead strips.

The number of strips, the relation of the height and distance between the lead strips (ratio) and the interspace medium all determine the quality of the grid. The secondary radiation grids from CAWO are among the best available in the world.

Range of focused grids

Lines / cm	Ratio	FFD*
N30	R8	105, 180
N30	R10	105, 180
N40	R8	105, 180
N40	R10	105, 180
N40	R12	105, 180
N70	R8	105, 180
N70	R10	105, 180
N70	R12	105, 180

FFD*: Film-Focus-Distance

Minimum and maximum focus grid distances according to IEC 60627 for focused grids

Width	Ratio 8 FFD 105	Ratio 8 FFD 180	Ratio 10 FFD 105	Ratio 10 FFD 180	Ratio 12 FFD 105	Ratio 12 FFD 180
18 cm	66 - 250	-	71 - 198	100 - 900	76 - 172	108 - 545
24 cm	73 - 187	103 - 720	78 - 162	112 - 450	61 - 148	120 - 360
30 cm	77 - 162	112 - 450	82 - 146	122 - 346	85 - 136	129 - 300
35 cm	81 - 150	119 - 370	85 - 138	128 - 305	87 - 131	134 - 273
43 cm	84 - 139	127 - 310	88 - 130	135 - 269	90 - 125	141 - 250