Equation Flashcards by Lindsey Kaminski

Q

Period Equation

A

1/f

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Q

Frequency Equation (period)

A

1/T

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Q

Frequency Equation (wavelength)

A

c / WL

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Q

Wavelength Equation

A

c (1.54 mm/us) / f

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Q

Propagation Speed

A

Elasticity/density

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Q

Amplitude equation

A

1/2 (max amp - min amp)

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Q

Intensity Equation

A

Power / Area

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Q

Pulse Duration Equation

A

cycles X T
# cycles / f

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Q

Spatial Pulse Length Equation

A

cycles X WL

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Q

Pulse Repetition Period (PRF) Equation

A

1 / PRF

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Q

Pulse Repetition Period (Depth) Equation

A

13 us X Depth

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Q

Pulse Repetition Frequency (PRP) Equation

A

1 / PRP

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Q

Pulse Repetition Frequency (Depth) Equation

A

77,000 / Depth

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Q

Duty Factor Equation

A

(PD / PRP) X 100

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Q

Beam Uniformity Coefficient Equation

A

SP / SA

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Q

Temporal Average Equation

A

PA X DF

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Q

Attenuation Coefficient Equation (f)

A

f / 2

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Q

Attenuation Coefficient Equation (dB)

A

0.5 dB / cm / MHz

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Q

Total Attenuation Equation

A

Attn Co / distance

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Q

Half Value Layer Thickness Equation (attn co)

A

3 / Attn Co

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Q

Half Value Layer Thickness Equation (f)

A

6 / f

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Q

Impedance Equation

A

density X PS

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Q

Incident Intensity Equation

A

Reflected intensity + Transmitted Intensity

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Q

IRC % Equation

A

(Reflected intensity / incident intensity) X 100

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Q

ITC % Equation

A

(Transmitted intensity / incident intensity) X 100

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Q

IRC % (perpendicular incidence) Equation

A

(Z2 - Z1 / Z2 + Z1)^2 X 100

Q

Snells Law Equation

A

sine transmission angle / sine incident angle = PS medium 1 / PS medium 2

Q

Total distance Equation

A

1.54 X go return time

Q

Range Equation (depth)

A

.77 X go return time

Q

Bandwidth Equation

A

max f - min f

Q

Q factor Equation

A

main f / operating f

Q

Fractional bandwidth Equation

A

bandwidth / operating f

Q

Frequency Equation (PZT)

A

PS of PZT / 2 x thickness

Q

PZT thickness Equation

A

1/2 WL of PZT

Q

ML thickness Equation

A

1/4 WL of ML

Q

Focal Depth Equation

A

d^2 / 4 x WL

Q

Focal Depth Equation (rewritten)

A

d^2 x f / 6

Q

Axial Resolution Equation

A

SPL / 2

Q

Lateral Resolution Equation

A

Beamwidth

Q

Tframe Equation

A

pulses x PRP

Q

Frame Rate Equation

A

1 / Tframe

Q

Line Density Equation

A

lines / sector angle

Q

Spatial Resolution Equation

A

lines / sector angle

Q

Elevational Thickness Equation

A

beam height / thickness

Q

Axial Resolution Equation (WL)

A

(WL x # cycles) / 2

Q

Dynamic Range Equation (system components)

A

20 x log (highest / lowest)

Q

Dynamic Range Equation (intensity)

A

10 x log (final intensity / initial intensity)

Q

Mechanical Index Equation

A

Peak Negative Pressure / sqr root f

Q

Reynolds Number Equation

A

( velocity x diameter x density ) / viscosity

Q

Bernoulli Equation

A

4 (v2^2)

Q

Pressure Gradient Equation

A

flow x resistance

Q

Voltage Equation

A

current x resistance

Q

Doppler shift Equation

A

reflected f - transmitted f

Q

Doppler Equation

A

(2 x v x operating f x cos 0) / PS 154000

Q

Nyquist Limit Equation

A

PRF / 2

Q

Measured velocity Equation

A

true velocity x cos 0

Q

Velocity Equation

A

(DS x 154000) / 2 x operating f x cos 0

Q

Temporal Index Equation

A

Wp / Wdeg

Q

Color Frame Rate Equation

A

lines per ROI x doppler packet x ROI depth

Q

Sensitivity Equation

A

TP / (TP + FN)

Q

Specificity Equation

A

TN / (TN + FP)

Q

Accuracy Equation

A

(TP + TN) / (TP + FP + TN + FN)

Q

Positive Predicitve Value Equation

A

TP / (TP + FP)

Q

Negative Predicitive Value Equation

A

TN / (TN + FN)