Which of the following factors does NOT contribute to decreased spatial resolution when increasing the pitch?

Increasing the pitch in computed tomography refers to the ratio of the table movement per rotation of the x-ray tube to the width of the x-ray beam used during the scan. When the pitch is increased, the distance between the x-ray beams becomes greater, which can lead to a decrease in spatial resolution.

In this context, the rotation time refers to the time it takes for the x-ray tube to make a complete rotation. A faster rotation time typically enhances spatial resolution because it reduces the time that any given area is exposed to the x-rays, minimizing motion artifacts and allowing for clearer images. Therefore, while rotation time influences image quality, it does not inherently contribute to decreased spatial resolution associated with increased pitch.

Conversely, factors such as tube current, acquisition thickness, and detector configuration do influence spatial resolution. Higher tube currents can improve image quality by enhancing signal-to-noise ratio, but increasing acquisition thickness can blur finer details, thus decreasing spatial resolution. Detector configuration impacts how the x-rays are detected and reconstructed into images; a poorer configuration leads to lower spatial resolution. Hence, the factor that does not contribute to decreased spatial resolution when increasing pitch is the rotation time.