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A series exposures were made using a digital dosimeter, using a constant kV and mAs but varying the combination of mA and time for each exposure. The dose varies greater than 10% between exposures. The most probable cause is that the

The best position to demonstrate the splenic flexure on a BE is

The common bile duct is

Exostosis, osteoma, osteoporosis are

Collimation, without changing technique would decrease

Higher kV is required when irradiating dense structures because of

The pylorus is

The scale of densities that determines the contrast and visibility of detail is controlled by

The initial images indicate a possibility of fluid within the right hemithorax. The correct position of the thoracic cavity to demonstrate this condition is

The LD 50/30 for humans ranges from