# Shared Flashcard Set

## Details

Ultrasound Physics Formulas
Ultrasound Physics Formulas
54
Physics
Not Applicable
06/01/2016

Term
 Period(s)  =
Definition
 1               Frequency(Hz)
Term
 Frequency(Hz)  =
Definition
 1       Period(s)
Term
 Wavelength(mm)  =
Definition
 C(mm/us) F(Hz)
Term
 Spatial Pulse Length(mm)  =
Definition
 # of cycles x λ(mm)
Term
 Axial Resolution(mm)  =
Definition
 SPL(mm) 2
Term
 Axial Resolution(mm)  =
Definition
 .77 x #cycles   F(MHz)
Term
 Lateral Resolution  =
Definition
 Beam Diameter (width)
Term
 Transducer Frequency(MHz)  =
Definition
 C in PZT (mm/us)    2 x thickness(mm)
Term
 Focal Depth(mm)  =   (Focal Length & Near Zone Length)
Definition
 Diameter2(mm) x F(MHz) 6
Term
 Focal Depth(mm)  =   (Focal Length & Near Zone Length)
Definition
 diameter2(mm)    4 x  λ(mm)
Term
 Sin Divergence Angle  =   (Beam Divergence)
Definition
 1.85               diameter(mm)  x  F(MHz)
Term
 Sin Divergence Angle  =   (Beam Divergence)
Definition
 1.2  x  λ(mm)   diameter(mm)
Term
Definition
 2# of bits
Term
 Attenuation Coefficient(dB/cm)  =
Definition
 F(Hz) 2
Term
 Attenuation(dB)  =
Definition
 AC(dB/cm)  x  distance(cm)
Term
 Rayleigh Scatter  oc
Definition
 F4
Term
 (reflector) Depth(mm)  =
Definition
 C(mm/us)  x  Go-Return time(us) 2
Term
 Pulse Repetition Period(us)  =
Definition
 Imaging depth(cm)  x  13us/cm
Term
 Pulse Repetition Frequency(Hz)  =
Definition
 77,000cm/s     Depth(cm)
Term
 Depth(mm)  oc
Definition
 PRP(us)  PRF(MHz)
Term
 Intensity(W/cm2)  =
Definition
 Power(W) Area2(cm)
Term
 Intensity  oc
Definition
 Power(W)
Term
 Intensity  oc
Definition
 Amplitude2
Term
 Pulse Repetition Period(us)  =
Definition
 1             PRF(MHz)
Term
 Pulse Repetition Frequency(MHz)  =
Definition
 1        PRP(us)
Term
 Time Per Frame(s)  =   (Tframe)
Definition
 # of pulses  x  PRP(s)
Term
 Frame Rate(Hz)  =
Definition
 1           Frame Time(s) (Tframe)
Term
 Temporal Resolution(Hz)  oc
Definition
 Frame Rate(Hz)
Term
Definition
 Flow  x  Resistance
Term
 Voltage  =
Definition
 Current  x  Resistance
Term
 Doppler Shift(Hz)  =   (Doppler Δ)
Definition
 Reflected F(Hz)  -  Transmitted F(Hz)   (Fe-Fo)
Term
 Doppler Shift(Hz)  =   (Doppler Δ)
Definition
 2  x  Velocity (of blood)  x  Fo  x  cosθ C
Term
 Nyquist Limit(Hz)  =
Definition
 PRF(Hz) 2
Term
 Reynolds #
Definition
 < 2000
Term
 Measured Velocity  =
Definition
 True Velocity  x  θ
Term
 Pulse Duration(us)  =
Definition
 # cycles  x  Period(us)
Term
 Pulse Duration(us)  =
Definition
 # cycles      F(MHz)
Term
 Duty Factor(%)  =
Definition
 PD(us)        PRP(us) x  100
Term
 Impedance(rayls)  =
Definition
 Density(kg/m3)  x  C(mm/us)
Term
 Incident Intensity(W/cm2)  =
Definition
 Reflected Intensity(W/cm2)  +  Transmitted Intensity(W/cm2)
Term
 Intensity Reflection Coefficient(%)  =
Definition
 (Z2 - Z1)2        (Z2 + Z1)2   x  100
Term
 Intensity Transmission Coefficient(%)  =
Definition
 Transmitted Intensity(W/cm2)          Incident Intensity(W/cm2) x  100
Term
 100%  =
Definition
 IRC(%)  +  ITC(%)
Term
 Angle of Incidence  =
Definition
 Angle of Reflection
Term
 Snell's Law of Refraction
Definition
 sin (Trans Angle)  =  Speed of Medium 2 sin (Incid Angle)   =  Speed of Medium 1
Term
 Speed  oc
Definition
 Stiffness (Bulk Modulus)
Term
 Quality Factor  =
Definition
 Main F    Bandwidth
Term
 Measured Index  =
Definition
 Peak Rarefaction(Negative) Pressure √F
Term
 Resistive Index  =
Definition
 VelocityMAX  -  VelocityMIN VelocityMAX
Term
 Pulsatility Index  =
Definition
 VelocityMAX  -  VelocityMIN VelocityMEAN
Term
 Measured Pressure  =
Definition
 Circulatory Pressure  +  Hydrostatic Pressure
Term
 Velocity of blood  =   (In Doppler)
Definition
 C  x  Doppler Δ 2  x Fo  x θ
Term
 1  =
Definition
 PRF(Hz)  x  PRP(s)
Term
 1  =
Definition
 P(s)  x  F(Hz)
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