Abstract
Abstract This research was accomplished to assess dose effects on image quality at computed radiography (CR). The ultimate target of the research was finding optimized exposure that provides necessary image quality for the clinical chest diagnosis. Modulation transfer function (MTF), n ormalized noise power spectrum (NNPS), and Noise equivalent quanta (NEQ) corresponding to the different do ses were measured for the assessment of image quality. The preparation of “edge test device” used in MT F measurement and experimental geometry setup were followed by the recommendations of International Ele ctrotechnical Commission (IEC). The experimental results show the necessary image quality can be ac hieved even at a half of the automatic exposure control (AEC) setting dose for chest diagnosis. It mea ns that the patient exposure can be reduced dramatically by using optimized dose. Key words: computed radiography (CR), chest image quality, dose control, optimized dose, modulation transfer function (MTF), noise power spectrum (NPS), noise equivalent quanta (NEQ)
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