![]() ![]() A similar procedure was adopted for the tube current (mA). The kVp was gradually decreased and halted if radiologists and radiographers uncon-nected with the work expressed misgivings about the quality of the image. Over a three-month period, the patients were examined with the 90th percentile of tube potential (kVp) while keeping other factors constant. ![]() The range of exposure factors (kVp, mA and mAs) used by radiog-raphers in the centre was noted and the 90th percentile calculated. Chest examinations were done at a Focus-Film-Distance (FFD) of 150 - 180 cm while all other examinations were conducted at 90 - 100 cm FFD. Materials and Method: A static X-ray machine, a digitizer, and photostimulable phosphor plates were used for the X-ray examination. Objective: To derive a computed radiography exposure chart for a negroid population using AGFA photostimulable phosphor plates and a GE static X-ray machine. ![]() A conscientious effort is there-fore, needed by the radiographer to keep exposure as low as reasonably achievable. Consequently, the risk of dose creep is high. Background: Computed radiography has a wider exposure latitude when compared with film-screen imaging system. ![]()
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