Do me a favour. Go to fda site for 510k search, if you choose radiology and clinical trial - yes, you will not find any SE determination. in other words, in the past all the radiology devicess which don't require clinical trials for 510k submission. That is obvious and black and white. Please post with facts.
- class II devices which require clinical trials are Gatronology, neuelogy, some of opthalmic, etc.
Not a single device in Radiology departments. Read and learn.