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13 Cards in this Set

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 Define mA The quantity of electrons moving through the x-ray tube during an exposure. What is the function of mA? To establish the desired quantity of electrons that will strike the anode during the exposure to produce various quantities of primary radiation. Explain how ma determines tube current. As the mA selector is turned up at the control panel, more current will pass through the filament circuit. This increases tube current. Explain how mA controls quantity of the x-ray beam and exposure rate. As mA increases so does the number of electrons which are able to cross the tube to reach the x-ray target. Explain how mA influences focal spot size. High mA exposures require a large focal spot and low mA exposures use the small focal spot. Explain the importance of the reciprocity law. A compatibility between the accumulation of radiation on the film caused by beam intensity and exposure time. Define calibration The mA selected is equal to the actual mA output. Explain the importance of calibration. Calibration is important when the technologist must deviate from the technique chart. If the generator is out of calibration, equal densities will not result at the same mAs values. Explain the role of mA in relationship to patient dose. As mA increases, the number of photons produced increases and patient dose increases. Explain the effect of mA on the radiographic image. As mA increases, more x-rays are produced, resulting in a greater accumulatino of x-rays on the film's emulsion. Explain the effect of time on the radiographic image. As time increases, x-rays are produced for a longer period of time, resulting in a greater accumulation of x-rays on the film's emulsion. Explain the important limitations to phototiming. Phototiming has difficulty in producing consistent radiographs when radiographing patients with a variety of diseases. Little positioning latitude Reaction time of the photoelectric cell. The manual timer will override the phototimer device. List some advantages of phototiming. 1) Provide consistent densities from patient to patient. Quality is more predictable. 2) Radiographic contrast is relatively consistent.