Physics equations

Impendance equation

Z = Density x Speed

Cycle Equation

1 compression and 1 refraction

Frequency Equation

F = 1/T (period time)

Intensity (W/cm2) Equation

Power(w) / area (cm2)

Wavelength (mm) Equation

Propagation speed(mm/us) / Frequency (MHz) or Propagation speed x period

Speed m/s Equation

Frequency (Hz) x Wavelength (m)

Pulse Duration (microsecond) Equation

# cycles x period (microsecond) or #cycles/ Frequency (MHz)

PRF Equation Pulse Repetition Frequency

1/PRP or PRF x PRP =1

DF Duty Factor Equation

(PD (msec) / PRP (msec) )x 100

SPL Equation Spatial Pulse Length

# cycles x wavelength

Attenuation Coefficient (dB/cm) Equation

AC = Frequency (mHZ) / 2

Total Attenuation Equation

attenuation coefficient (dB/cm) x distance (cm)

HVL Equation Half Value Layer

3/AC or Frequency /2 or 6/Frequency

Impedance (rayls) Equation

density (kg/m^3) x propagation speed (m/s)

Intensity Equation

Power(Watts)/beam area (cm^2)

What is the formula for the conservation of energy for intensity?

100% = IRC (%) + ITC (%)

axial resolution equation (mm)

SPL mm / 2

Or

(wavelength mm x #cycles in pulse ) / 2

Depth mm Equation

(1.54m/msec X Go Return Time msec ) / 2

PZT Equation

1/2 Wavelength thick

Matching Layer Equation

1/4 Wavelength Thick

QF Quality Factor Equation

Main frequency MHz/ Bandwidth MHz

Frequency MHz

Sound of speed in PZT / 2x thickness mm

Pressure Gradient PG equation

flow X resistance

Flow equation

pressure gradient/resistance

Doppler shift equation

2 X speed of rbc X transducer frequency X cos0

/ propagation speed