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62 Terms
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volume
v=L^3
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Density
d=m/v
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velocity
v=d/t
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accleration
a=v/t
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work
w=Fxd
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Power
P= W/t or energy/t
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1kg = ___ grams
1000
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frequency
f= # of cycles/sec
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frequency (hZ)
1 cycle/sec
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frequency (KHz)
1000 cycles/sec
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frequency (MHz)
1,000,000 cycles/sec
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propagation speed
c = f x wavelength
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Intensity
I= P/A or I^2
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Stiffness/impedance
Z=1/K or 1/e
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2 way distance
d= c x (t/2)
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1 way distance
d=c x t
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Pulse Duration
PD = T x #of cycles/pulse
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Spatial pulse length
wavelength x (# of cycles/pulse)
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Quality Factor
fo/BW
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Pulse Repetition Frequency
\# of pulse/sec
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Pulse Repetition Period
1/PRF
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BUR
SP/SA
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Duty Factor
PD/PRP
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Bandwidth
highest f - lowest f
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fractional bandwidth
BW/fo
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PRF for imaging
4-15kHz
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PRF for Doppler
5-30kHz
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cycles per pulse for imaging
2-3
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cycles per pulse for Doppler
5-30
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DF of CW
1
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Imaging DF range
.1-1%
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Doppler DF range
.5-5%
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\-3dB
reduction by 1/2
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\-10dB
reduction by 1/10
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Specular Reflector
T=1-R
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Angle of incidence =
angle of reflection
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Attenuation
Att = ac x f x path length
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attenuation coefficient of soft tissue
.5 dB/cm (for 1 MHz)
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HVL of soft tissue
6cm/f
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sin of 0˚
0
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sin of 30˚
.5
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sin of 45˚
.707
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sin of 60˚
.866
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sin of 90˚
1
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Reflection coefficent
(Z1-Z2/Z1+Z2)^2
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Continuity
Q=Va (area)
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Reflection
8LV/πr^4
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Doppler Shift
fd= fR-fT
fd = 2/c (v x fT x cosθ)
fd = 2/c (v x fT x cosθ)
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Poiseuilles
ΔPπr^2/8LV
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Cos 0˚
1
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cos 60˚
.5
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cos 90˚
0
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cos 180˚
\-1
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PRF
#of foci x LD x FR
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Attenuation
ac x f x path length
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snells law
sin anglei/sin anglet = ci/ct
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transmission coefficient
T=1-R
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Reflection coefficient
(z1-Z2/Z1+Z2)²
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Resistance
R=8Lv/pier^4
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Volumetric flow rate/poiselles
Q= deltaPxpiexr^4/8Lv
Deltap/R
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Note 
Flashcards (50)