| RADAR | rapid assessment of disease activity in rheumatology |
|---|---|
| RAGE | rapid gradient echo |
| RAM | random-access memory; rapid alternating movements; rectus abdominis muscle; rectus abdominis myocuta... |
| RARE | rapid acquisition with relaxation enhancement |
| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |