Physics Formula's

Pressure = (Pascals) Force / Area Applied

Power = (Watts) Amps2 And Intensity = Amps2

Intensity = Watts/cm²) Power / Area

Wavelength = (cm - distance) 1.54 Or Speed Of Sound / F

Propagation Speed = (meters/sec) F * Wavelength

PD = (time – us) # Cycles * Period   or    PD = # Cycles / Frequency  

SPL = (Length –mm ) # Cycles * Wavelength

PRP = (Time – us) Depth * 13 us/cm

PRF = (Hz – per sec) 77,000/ Image Depth or Pulses per sec * Images per sec

# Line Per Frame * Frame Rate

Duty Factor = (percent) Pulse Duration / PRP *100

Total Attenuation = (dB/cm²) Attn. Coef * Distance (Attenuation Coefficient = F/2)

Half Layer Thickness = (cm – distance) 3 dB / Attn. Coef

Impedance = (Rayls) Density * Propagation Speed In A Medium

AXIAL Resolution = (cd – distance) Spacial Pulse Length / 2 or .77* Number Of Pulses/ F

Q-Factor = (Percent) Main Frequency/Bandwidth

Axial Resolution = (mm, cm – distance) 2 * Reflecter Speed * frequency *cos / Propagation speed

Lateral Resolution = (mm, cm – distance) ½ PZT Diameter = Focus

Reynolds Number = (Unit Less)  Average Flow Speed * Diameter Of Tube *Density / Viscosity

Nyquist Limit  = (Hz) Doppler Shift Frequency > Half The PRF (PRF/2)

PW Frequency = PZT * Propagation speed / 2 * thickness

Focal Depth = diameter of PZT² / 4 x wavelength

Note:

(Arterial /Measured) Pressure = Circulatory Pressure + Hydrostatic Pressure Another = Pressure Difference / Distance between Pressures

Energy Gradient – Flow From One Location To

Frame Rate & T_frame Are Reciprocals - Frame Rate * T_frame = 1

Limitation of sound is travel speed of 150,000 cm/s or 77,000 cm

SO: # of pulses * Images per sec * depth (must) < 77,000  (200 pulses * 20 images * @0cm depth = 80,000 and so this can not happen.