| K-XRF | K x-ray fluorescence |
|---|---|
| L-XRF | L x-ray fluorescence |
| MMR | mass miniature radiography; masseter muscle rigidity; maternal mortality rate; measles-mumps-rubella... |
| PXM | projection x-ray microscopy; pseudoexfoliation material |
| RTA | ray tracing algorithm; renal tubular acidosis; reverse transcriptase assay; road traffic accident |