Physics and Instrumentation Exam 2

uniformity coefficient measures the uniformity of … intensity, equation

spatial, sp/sa

temporal average equation

pulse ave x duty factor

frequency relationship with absorption and scattering

direct

rayleigh scattering equation

frequency^4

IRC equation

(difference in impedance / total impedance)² x 100

half layer 2 equations

3 / atten coeff, 6 / frequency

fixed focal depth equation using wavelength

diameter² / 4 x wavelength

fixed focal depth equation using frequency

diameter² x frequency / 6

divergence equation

1.85 / diameter x frequency

lateral resolution relationship with beam diameter, crystal width, divergence

inverse

attenuation coefficient units, equation, total attenuation equation

db/cm, freq/2, freq/2 (path length)

time of flight equation

depth (mm) = 1.54 x go return time / 2

PRF (Hz) formula using depth

77000 cm/s / depth

PZT stands for

lead zirconate titanate

quality factor equation

main frequency / bandwidth

v-shaped constructive interference of waves / narrowing

diffraction

mnemonic for axial resolution and what it stands for

larrd, longitudinal axial radial range depth

mnemonic for lateral resolution and what it stands for

lata, lateral azimuthal transverse angular