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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. |