Transcription of Using Automatic Exposure Control in Digital Radiography
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Using Automatic Exposure Control in Digital Radiography
1 Using 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, and possibly solid state ionization chambers.
Oscilloscopes Acquire a series of images with a phantom that yields clinicallyrelevant exposure times (3-10 msec) Examine exposure time in DICOM header Measure SNR in a uniform portion of the image COVSNRSNR < 0.05 Also, it is very important …
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