The milliampere second (mAs), Kilovoltage (kV) and FDD should be recorded for each patient and checked prior to new mobile radiographs. Repeat images are rarely required because of exposure errors when anatomically programmed generators are used with the equipment
As long as the detector is not underexposed or greatly overexposed a diagnostic image will be displayed. Images will be displayed with the optimum density and contrast when the system has been set up with the required algorithm for chest imaging in our examination. One major advantage of digital radiography systems is the very wide exposure latitude. It’s the responsibility of the radiographer / technologist to select a technique that provides enough exposure to reduce the amount of noise while also adhering to ALARA/ALARP standards. Images should be repeated if relevant anatomical details or ability to see lines or endotracheal tubes in the mobile chest image cannot be distinguished because of poor positioning or exposure making the image undiagnostic. The 3-point scale for producing diagnostic images is: Image evaluation for exposure should perhaps be conducted using EI T is the EI for a given radiograph and the target exposure. Gross over exposure will result in ‘burned out’ pixels losing anatomical detail usually in the lungs. Underexposure can result in image noise, however, overexposed images will be displayed optimally on the display screen often at ten times the exposure. Digital systems generally display images with the optimum density and contrast regardless of the exposure factors. It is therefore important for the radiographer / technologist to understand Exposure Indicators (EI) and the Deviation Index (DI).
There is limited visual connection between the exposure given to the patient and the image displayed on the screen used to view the image. This is probably the most complex aspect of producing diagnostic images at the optimum radiation dose (ALARA/ALARP).
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