In order to become familiar with manual technical factors (i.e., setting mAs and kVp and not using AEC), it is very helpful to pay attention to the:

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The best choice is the mAs readout, as this is the most direct measure of the amount of radiation being used for the exposure. By setting the mAs manually, the technologist can control the amount of radiation reaching the image receptor and adjust for differences in patient size and density. The other options listed (exposure time, heat units, and density control) are important factors to consider when setting mAs and kVp, but are not as directly related to manual technical factors.

In Order to Become Familiar with Manual Technical Factors (I