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Physics 111 > 111 Formulas > Flashcards

111 Formulas Flashcards

1
Q

Frequency (MHz)

A

Prop Speed (mm/us) / Wavelength (mm)

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2
Q

Frequency (MHz) *Inverse

A

1 / Period (us)

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3
Q

Period (us)

A

1 / Frequency (MHz)

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4
Q

Wavelength (mm)

A

Prop Speed (mm/us) / Frequency (MHz)

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5
Q

PRF (kHz)

A

1 / PRP (ms)

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6
Q

PRP (ms)

A

1 / PRF (kHz)

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7
Q

PD (us)

A

Period (us) x #cycles in the pulse

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8
Q

SPL (mm)

A

wavelength (mm) x #cycles in the pulse

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9
Q

Duty Factor (unitless)

A

PD (us) / PRP (us)

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10
Q

Quality Factor (unitless)

A

Op Freq / Bandwidth

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11
Q

Prop Speed (mm/us)

A

Wavelength (mm) x Freq (MHz)

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12
Q

Intensity (W/cm2)

A

Power (Watts) / Area (cm2)

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13
Q

Intensity direct proportion to

A

Power & Amp2

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14
Q

Amplitude units

A

Dependent on acoustic variable (Pa, g/cm3, cm, dB, etc)

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15
Q

Attenuation Coefficient (dB/cm)

A

0.5 dB/cm x Freq (MHz)

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16
Q

Frac Bandwidth

A

Bandwidth / Op Freq

17
Q

Positive Decibels

A

Signal strengthens (3dB=1/2; 6dB=1/4; 9dB=1/8; 12dB=1/16)

18
Q

Negative Decibels

A

Signal lessens (3dB=1/2; 6dB=1/4; 9dB=1/8; 12dB=1/16)

19
Q

Impedance (rayls)

A

density (kg/m3) x Prop Speed (m/s)

20
Q

IRC (unitless)

A

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

21
Q

IRC

A

Reflected Intensity (mW/cm2) / Incident Intensity (mW/cm2)

22
Q

ITC

23
Q

ITC

A

Transmitted Intensity (W/cm2) / Incident Intensity (W/cm2)

24
Q

Range Equation (mm)

A

1/2 x [prop speed (mm/us) x pulse round trip time (us)]

25
Q

Op Freq (MHz)

A

Prop Speed (mm/us) / 2 x Thickness of element (mm)

26
Q

Lateral Resolution (mm)

A

Beam Width (or diameter) (mm)

27
Q

Axial Resolution (mm)

A

SPL (mm) / 2

28
Q

PRF (Hz)

A

foci x LinesPerFrame x FrameRate

29
Q

Pen Depth formula

A

Pen Depth (cm) x PRF (Hz)

30
Q

Typical DFs

A

Sonography- 0.1-1.0%

Doppler- 0.5-5.0%

31
Q

Typical DFs

A

Sonography- 0.1-1.0%

Doppler- 0.5-5.0%

32
Q

Useful freq for diagnostic

A

2 to 15 MHz

33
Q

Freq for optham deem and intravasc

34
Q

Transducer elem impedance compared to soft tissue

A

20 times more

Physics 111 (6 decks)

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