Is there a limit to the number of years a petct starter source can be used?

Yes. pet-ct is an imaging method that has been used more and more frequently in Chinese hospitals in the last 20 years. ct scanning machines are basically imported from abroad, and the price can range from three to five million to tens of millions of dollars, and the optimal life span of a machine is only 8-10 years. pet-ct is very different from traditional ct and greatly improves the efficiency of the examination.