Which scatter reduction technique also reduces patient exposure when technique adjustments are made?

Collimation is the correct choice because it precisely limits the size of the x-ray beam to the area of interest, which not only reduces the amount of scatter radiation produced but also minimizes the patient's exposure to unnecessary radiation. By concentrating the beam on a smaller area, fewer photons scatter, which leads to less scatter radiation reaching both the receptor and the patient. When collimation is implemented, adjustments to the technique can be made to lower the overall radiation dose while still achieving adequate image quality.

Other techniques, like using a grid, can help reduce scatter but may not necessarily lower patient exposure when technique adjustments are made. Low kVp techniques can increase patient exposure due to the increased radiation needed to maintain image quality, while high mAs techniques would likely increase patient exposure rather than reduce it. Thus, collimation stands out as a technique that effectively limits both scatter and exposure.