Hello, friend. We are in a similar situation. By the end of this year, I will graduate, and I am looking to immigrate afterward.
Here's what I found so far.
In the US, to become a Radiologic Technologist, one must finish 2 years of a college education (Associate Degree Level).
In my country, however, to become a Radiologic Technologist, one must finish 3 years of a college education (Bachelor's Degree Level).
In some other countries, to become a Radiologic Technologist, one must finish 4 years of a college education (also Bachelor's Degree Level).
This fact alone might be troublesome for us. The Employer might have difficulty convincing the USCIS that the 3 or 4 years Bachelor's Degree is a requirement for the position. Troublesome but not impossible.
Other than an H-1B visa, it would be possible, and maybe even easier, to get a Green Card for a Radiologic Technologist. We just need a sponsor. The Employer just has to be willing. If willing, all they really need to prove is that nobody wanted the position when they advertised for it. This is a matter of luck, but since the job market for RT in the US is good, it's not like winning on DVL type of luck.
However, there is a problem with the ARRT certification. Concerning the certification, first, we must complete an ARRT acknowledged college to even be able to apply for the certification testing. I can not find the list of acknowledged ARRT schools because, in my country, I can not even open the ARRT website. It is blocked for reason unknown to me. But I know that my college is not ARRT recognized.
However, I managed to find out that not all countries in the US require an ARRT certificate or any other certificate at all.
So, my understanding is next.
First, we need to search the job advertisements in Alabama, Alaska, Idaho, North Carolina, Missouri, or South Dakota. Second, we apply for positions that we meet the requirements (that do not require the ARRT certificate or any other certificate). Third, we make an agreement with the Employer. Then, the Employer sponsors us, either for an H-1B visa to test us or directly for an employment-based Green Card if the test is not really needed for the employer.
So, the Employer advertises, only we apply, then they file the paperwork for us, prove that we were the only one interested in the position, and that's it.
I guess that medical institutions along the northern border of the US routinely hire Radiologic Technologists from Canada. I also guess that they are familiar with the immigration process and that they might be more open to hiring us. With that being said, I finally guess that the State of Idaho is our best bet for finding a medical institution to help us with our immigration intentions.
Best of luck to you. Let's stay in contact to help each other if one of us succeeds first.
Cheers!