What is the impact of Compton scatter on image quality with MV beams?

Compton scatter significantly reduces image quality when using megavoltage (MV) beams. This occurs because Compton scattering can result in the scattering of photons, which leads to increased noise and a decrease in the contrast of the image. In imaging techniques, particularly in radiography and radiotherapy, high-energy MV beams can interact with matter leading to scattered X-rays that contribute unwanted signal to the image. This scattered radiation can cause the details to become less distinct and the overall sharpness of the image to diminish, resulting in reduced contrast between different structures within the image. Consequently, when evaluating the impact of Compton scatter on image quality, the understanding is that it generally results in a loss of contrast, making it challenging to discern finer details that are crucial for accurate diagnosis and treatment planning.