As tissue density decreases, photon attenuation will:

As tissue density decreases, photon attenuation will decrease. This relationship is based on the concept that denser tissues contain more particles for the photons to interact with, leading to a higher likelihood of absorption or scattering of those photons. When the density of the tissue is lower, there are fewer particles available for these interactions, resulting in a lower rate of attenuation.

Photon attenuation refers to the reduction in intensity of the radiation beam as it passes through a material, which can be caused by absorption or scattering. Thus, in tissues with lower density, such as fat compared to muscle or bone, there is less interaction with the photons, leading to decreased attenuation. Understanding this principle helps in comprehending how various tissues affect imaging and radiation dose in radiologic examinations.