Which projection may be improved by using a low-milliampere (mA), long-exposure time technique?

Using a low-milliampere (mA) and long-exposure time technique can be particularly beneficial for certain projections where motion blur is less of a concern and greater detail is needed for the structures being imaged.

In the case of the right anterior oblique (RAO) sternum, this technique allows for a higher image contrast, which can enhance the visibility of the sternum itself and adjacent anatomy. By utilizing a longer exposure time, patient motion can be minimized, which is crucial for capturing a clear image of the sternum since it is positioned obliquely and may be more susceptible to blurring from patient movement during shorter exposure times. The use of lower mA reduces the radiation dose while still allowing for sufficient image quality for diagnostic purposes.

Conversely, projections such as the upright abdomen, anteroposterior axial clavicle, and lateral chest generally require higher mAs to ensure the structures are adequately visualized and to minimize the potential for motion artifacts. These projections often involve larger areas and may require more detail and shorter exposure times to avoid blurriness from involuntary patient movement or breathing.