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  Indian J Med Microbiol
 

Figure 4: Schematic of (a) a pinhole collimator and (b) a lofthole collimator with a circular aperture and a rectangular entrance/exit opening. This type of collimator creates the rectangular projection on the detector

Figure 4: Schematic of (a) a pinhole collimator and (b) a lofthole collimator with a circular aperture and a rectangular entrance/exit opening. This type of collimator creates the rectangular projection on the detector