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Tasha US formulas
Tasha DMS Physics formulas
| Question | Answer |
|---|---|
| T (period) | 1/f |
| wavelength | c/f |
| PRP | 1/PRF |
| PD | #cycles in pulse x T |
| DF | PD/PRP or (PD(PRF))/1000 |
| SPL | #cycles in pulse x wavelength |
| I | P/A or amplitude squared |
| attenuation (a) | attenuation coeff.(L) aka: 1/2(f)(L) |
| attenuation coefficient | 1/2(f) |
| z (impedance) | p(c) aka: density(prop. spd.) |
| I (reflected) | I (initial) x IRC |
| I (transmitted) | I (initial) x ITC |
| range (d) | 1/2 (c)(t) |
| f (operating) | c (of transducer) / (2 x th) |
| NZL | aperture squared / (4 x wavelength) or (aperture squared x f) / 6 |
| 1 NZL | 1/2 diameter of transducer |
| FBW (fractional bandwidth) | BW / operating frequency |
| Q factor | operating freq / BW or 1 / FBW |
| roundtrip time for pulse in soft tissue | 13 microsec/cm |
| f# | focal lenth / aperture |
| min. beam width | f# x wavelength x 2 |
| th (thickness) | 1/2 x wavelength |
| AR (axial res.) | SPL / 2 |
| LR (lateral res.) | width of the beam |
| 1 HZ | 1 cycle per second |
| ultrasound | >20 KHz or >20,000 Hz |
| human hearing | 20-20,000 Hz |
| MHz | 1/microsec. |
Created by:
troland
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