What happens when the size of the DEL (pixel) decreases?

When the size of the Detector Element (DEL), or pixel, decreases, less x-rays hit each pixel. This is primarily because a smaller pixel occupies a smaller area, reducing the volume that can capture incoming x-rays. As a result, the overall number of x-ray photons that can interact with the smaller surface is decreased, which can impact image quality.

In digital imaging, smaller pixels can enhance image resolution because they can discern finer details. However, the relationship between pixel size and the amount of x-ray exposure is inversely proportional; as pixels get smaller, they may not capture as many x-ray photons, leading to potential issues with image brightness and noise. This can necessitate adjustments in exposure settings to obtain images of sufficient quality.

While smaller pixel sizes can lead to improved resolution in image clarity, the implication that more x-rays are absorbed, or that radiation exposure increases significantly, does not hold true in the context of pixel size alone without considering other factors such as exposure time and beam quality.