Figure 2. Variation of the contrast index C with tube potential for added filters of 1 mm Al and 0.2 mm Cu+1 mm Al at constant optical density 1.8 OD in the lung field for: (a) lung area; (b) cardiac area.
C with tube potential for added filters of 1 mm Al and 0.2 mm Cu+1 mm Al at constant optical density 1.8 OD in the lung field for: (a) lung area; (b) cardiac area.