It might be difficult. 'Registered Radiology Technologist' is a training pathway at the associate level (2 years of community college). While it is a longer training pathway in many other countries, it might be difficult to convince USCIS that the 4 year bachelors degree is a job requirement. If however a hospital would hire an RRT as 'supervisor' with a requirement for a bachelors level degree, an H1b could work out.
Funny enough, it would be possible to get a green-card for a radiographer. They just have to proove that nobody wanted the position when they advertised it. Given the good job market for x-ray techs, this should not be a problem.
Look for hospitals along the northern border of the US. They routinely hire canadian healthcare personnel and are familiar with the immigration process. They might be more open to filing paperwork than lets say southern or coastal hospitals (also, rural hospitals in the northern midwest and plains are bleeding for qualified personnel. another incentive to help you along with paperwork).
Good Luck. We need you guys.