physics principles

Question 1

Bandwidth refers to:

Answer 1

range of frequencies in a pulse

Question 2

In sound wave propagation, a region of elevated pressure is termed?

Answer 2

compression

Question 3

What is pulse duration?

Answer 3

time to complete one pulse

Question 4

what is frequency?

Answer 4

how many cycles occur in one second

Question 5

If the number of cycles in a pulse is increased but the wavelength remains the same, what else increases?

Answer 5

Pulse duration

Question 6

When you switch from a 2.5 MHz to a 5 MHz transducer, the sound wavelength:

Answer 6

halves

Question 7

Grating lobe artifact and lateral resolution improve with this kind of imaging:

Answer 7

Tissue harmonic imaging

Question 8

which of the following increases SPL?
increased PRF
decreased number of transmit pulses per frame
increased number of transmit pulses per sec
increased number of transmit pulses per line
increased number of cycles per pulse

Answer 8

increased number of cycles per pulse

Question 9

when you adjust PRF you change:
number of pulses per line
number of pulses per frame
number of pulses per second
number of wavelengths per second
number of wavelengths per pulse

Answer 9

number of pulses per second

Question 10

what term refers to regions of decreased particle density in a sound beam?
attenuation
transmission
compression
rarefaction
reverberation

Answer 10

rarefaction

particles are pushed together during compression and pulled apart during rarefaction

Question 11

axial res is determined by:
beam width
transducer diameter
pulse duration
attenuation coefficient
intensity

Answer 11

pulse duration

shorter PD = Better axial res

Question 12

in sound wave propagation, a region of elevated pressure is:
compression
demodulation
rarefaction
period
resonance

Answer 12

compression

a region of low pressure is rarefaction

Question 13

what is changed when you change the transmit freq:
displacement amp of the particles in the medium
speed at which the sound wave propagates through medium
number of cycles per second
pulses transmitted per second
number of electrical impulses applied to the xducer per second

Answer 13

number of cycles per second

Question 14

interference patterns of reflected waves causes:
acoustic speckle
acoustic enhancement
rarefaction
volume averaging
all of the above

Answer 14

acoustic speckle

Question 15

when you are changing the PRF you change:
number of pulses per line
number of pulses per frame
number of pulses per sec
number of wavelengths per sec
number of wavelengths per pulse

Answer 15

number of pulses per second

Question 16

axial res is determined by:
beam width
transducer diameter
PD
attenuation coefficient
intensity

Answer 16

Pulse Duration

Question 17

doppler pulses used for diagnostic purposes are typically \_\_\_\_cycles long
0-2
2-3
4-5
5-30
greater than 100

Answer 17

5-30

Question 18

the time it takes for one cycle to occur is:
duty factor
SPL
wavelength
PRF
PD

Answer 18

PD

Question 19

What term refers to regions of decreased particle density in a sound beam?
attenuation
transmission
compression
rarefaction
reverberation

Answer 19

rarefaction

particles are pushed together during compression and pulled apart during rarefaction

Question 20

you may observe sound attenuation by all of the following except:
reflection
scattering
conversion of sound to heat
absorption
compression

Answer 20

compression

Question 21

what freq are in audible range?

Answer 21

20hz-20000hz