1. Radiology - Head and shoulders above other in clinical radiology scientific content.
2. Subspecialty journals, e.g. AJNR for neuroradiology,, JVIR for interventional, etc.
3. AJR
4. Magnetic Resonance in Medicine (very technical)
5. Investigative radiology
6. JMRI (technical as well, but less than MRM)
many many others ...
There are excellent other ones that primarily have an educational focus only rather than research, such as radiographics, Applied radiology, etc.