| A | B |
|---|
| Thin Crystal-?wavelength | Short wavelength-high frequesncy |
| Thick Crystal-?wavelenght | Long Wavelength- low frequency |
| fast speed of sound in crystal | high frequency/short wavelength |
| slower speed of sound in crystal | low frequency/long wavelength |
| wide bandwidth (most imaging probes) | low Q factor |
| narrow bandwidth | high Q factor |
| backing material | reduces ringing- improving axial resolution by not letting the pulse ring long time and distance |
| active element | 1/2 wavelength thick |
| matching layer | 1/4 wabelength thick |
| focus point | narrowest point of beam |
| near zone | area from transducer to focus |
| focal length | length from transducer to focus |
| far zone | area from focus to end of beam path |
| focal zone | region around the focus where beam is relatively narrow |
| small diameter crystal-?frequency | low frequency |
| large diameter crytstal-?frequency | high frequency |
| long focal depth-?frequency | high frequency |
| short focal depth-?frequency | low frequency |
