Final answer:
A technique chart with constant kVp aims to achieve consistent image quality in radiographic imaging. It ensures that the X-ray's penetrating power remains unchanged for uniform contrast, but this does not relate directly to the provided aim, which involves measuring motion on a "Position vs. Time" graph in Physics.
Step-by-step explanation:
The technique chart that keeps kVp constant is aimed at achieving consistent image quality in radiographic imaging while varying other parameters to suit the part of the body being imaged. By keeping kVp constant, the radiologist ensures that the penetrating power of the X-rays remains unchanged, leading to uniform contrast across different images. However, it's important to note that this description doesn't quite match the aim provided, which relates to measuring consistent velocity using a "Position vs. Time" graph. This aim pertains to the analysis of motion in Physics, where the gradient of such a graph indicates average velocity when the motion is at a constant speed.