| Hfr | heart frequency; high frequency |
|---|---|
| HFT | high-frequency transduction; high-frequency transfer |
| RF | radial fiber; radio frequency; receptive field; regurgitant fraction; Reitland-Franklin [unit]; rela... |
| af | audio frequency |
| CBF | capillary blood flow; cerebral blood flow; ciliary beat frequency; coronary blood flow; cortical blo... |