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29 Cards in this Set
- Front
- Back
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Period (P)
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1/frequency
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Pulse Duration (PD)
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period * # of cycles
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PRP
Pulse repetion period |
13usec* depth
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Frame Time
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PRP X # of lines/frame
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Duty Factor
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PD/PRP
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Amplitude
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max - mean
mean - min max - min/2 |
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Power
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(Amplitude) 2(squared)
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Intensity
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Power/area
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Intensity, Power, Amplitude relationship
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intensity = power/area = amp(2)
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Distance
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rate * time
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Wavelength
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prop speed / frequency
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SPL (spatial pulse length)
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wavelength * # of cycles
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Axial Resolution
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SPL/2
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Lateral resolution
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= beamwidth
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Temporal resolution is determined by
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Frame rate
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Nyquist Limit
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sample frequency / 2
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Near zone length (NZL)
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D(2) * f / 6
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FBW %
fractional bandwidth |
BW/Operating frequency *100%
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Quality Factor
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1/FBW
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BUF (beam uniformity factor)
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SP / SA
Spatial peak intensity / spatial average intensity |
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Density (p)
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p= mass / volume
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Z
(Acoustic Impedence) |
p * c
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IRC
(% reflection) |
[z2 - z1] (2)
----------- [z2 + z1] |
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Attenuation Rate
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attenuation rate * depth * Frequency
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Attenuation rate of Soft Tissue
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0.5 dB (cm*Mhz)
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Attenuation rate of muscle
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1.0 dB (cm * Mhz)
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Doppler shift
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f dop = 2fv (cos) / c
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Poisieulle's law
Q= |
Q= ^P (pie) r(4) / 8nl
n=velocity l = length ^P= change in pressure |
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Relationship for Increased QF
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^QF = ^ sensitivity = ^PD = ^SPL = -bandwidth = - Axial Resolution
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