Final answer:
SNR in scintigraphy can be affected by factors such as the type of radioactive emission, the type of tissue being exposed, and other factors that affect the outcome.
Step-by-step explanation:
SNR, or Signal-to-Noise Ratio, in scintigraphy can be affected by several factors. One important factor is the type of radioactive emission. For example, beta particles have a factor of 1, while alpha particles have a factor of 10 for most tissues and 30 for eye tissue. Another factor is the type of tissue being exposed. Different tissues may have different factors that affect SNR. Additionally, other factors such as irregularities in the object being measured and any other factors that affect the outcome can also impact SNR.