Tex. Occ. Code § 601.107

In adopting minimum standards for certifying medical radiologic technologists, the advisory board may establish criteria for issuing a certificate to a person licensed or otherwise registered as a medical radiologic technologist by the American Registry of Radiologic Technologists, the American Registry of Clinical Radiography Technologists, or another state whose requirements for licensure or registration were on the date of licensing or registration substantially equal to the requirements of this chapter.