Using Automatic Exposure Control in Digital Radiography
1Using Automatic Using Automatic Exposure Control in Exposure Control in Digital RadiographyDigital RadiographyA. Kyle Jones, Kyle Jones, M. D. Anderson Cancer M. D. Anderson Cancer CenterDepartment of imaging PhysicsDepartment of imaging Physics2008 AAPM Meeting, Houston, TX2008 AAPM Meeting, Houston, TXAutomatic Exposure ControlAutomatic Exposure Control The purpose of AEC is to deliver consistent, The purpose of AEC is to deliver consistent, reproducible exposures across a wide range of reproducible exposures across a wide range of anatomical thicknesses, tube potentials, and anatomical thicknesses, tube potentials, and usersusers Detectors used in AEC systems include Detectors used in AEC systems include fluorescent screens with fluorescent screens with PMTsPMTs/photodiodes, /photodiodes, ionization chambers.
AEC system must be calibrated to deliver the necessary AEC system must be calibrated to deliver the necessary but sufficient Kaa to the image receptor Relatively simple task with screen/film imaging – achieve O.D. in linear portion of H+D curve (~ 1.4) Digital imaging is not contrast-limited, but noise limited
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