See my other answers. "Final reads" must be performed my a physician who did a radiology residency in the USA, and credentialed in the USA. Note, you don't need to be located in the USA, but it doesn't matter, there is no competing on price.
See my other answers. For each scan or xray performed, two fees are billed. The reimbursements are generally set in stone, and non-negotiable. Additionally, "fee-splitting" is Medicaire fraud. Meaning, if you as an independent businessperson own an imaging center and I read cases for you, you cannot keep any of my "professional fee" for reading the case. So there is no way for another radiologist to compete on price with me, it is simply illegal to offer to read the cases for less.