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Flashcards in SPI Review Deck (100)
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1

reciprical of .001

1000

2

reciprical of 1/10

10

3

how much bigger is one billion than one thousand

1,000,000

4

what happens to the period of a wave as it proagates

it remains the same

5

as sound travels through a medium what term descrives the effects of the meduim on the sound wave

acoustic propagation properties

6

what is the unit for the speed of ultrasound in soft tissue

m/s (1.54)

7

what is the freq of a wave with 1msec period

1khz

8

what is the distance covered by one cycle

wavelength

9

which of the following is determinded by the source and the medium? freq, period, prop speed, or range resolution

range resolution

10

a sound waves freq is 10MHz. The wave is traveling in soft tissue. What is the wavelength?

0.15 mm

11

what happens to the speed of sound in a medium when the bulk modulus of the medium increase

faster

12

if the level of an acoustic variable ranges from 55 to 105, what is the amplitude

25

13

if the intensity of a sound beam remains unchanged while the beam area is reduced in half. what has happened to the power

halved

14

what is the minimum value of duty factor

0%

15

what happens to the speed of sound in a medum when the bulk modulus of the medium decreses

slower

16

sound intensity is decreased by 75%. how many decibels of attenuation is this

6db

17

if a 5MHz sound wave is traveling in the russues listed below, which will have the longest wavelength? fat, air, muscle, bone

bone

18

what is the approxomate attenuation coefficient of 1

0.5dB/cm

19

ipedance is the ____ of _______ and ________

product, prpagation speed, density

20

for soft tissue, the approximate attenuation coefficient in dB/cm is equeal to 1/2 _____ in _________

freq, MHz

21

as the impendances of 2 media become vastly different the

reflection increases

22

the angle between an US pulse and the boundry between two madia is 56 degrees, this is called

oblique incidence

23

refraction only occurs if there are

obligue incidence and diff propagation speeds

24

with normal incidence what factors affect refraction of US? propagation speeds, frequencies, attenuation coefficients, none of the above

non of the above

25

true or false, with right angle incidence, reflections are alwayus generated at a boundry if the propagation speeds of the media are different

false

26

________ is a redirection of US in many directions uniformly as a result of rough boundary between 2 media

rayleigh scattering

27

under which of the following conditions is axial res umproved? decreased spatial pulse length, decreased pulse amplitude, decreased imaging depth, decreased pixel size, decreased beam diameter

decreased spatial pulse length

28

the most likely amount of refelction at a boundry between soft tussies is? 1%, 22%, 34%, 99%

1%

29

the most typical amount of transmission at a boundary in biologic media is? 1%, 22%, 34%, 99%

99%

30

sound is traceling from medium 1 to medium 2, propagation speeds of M1 and M2 are 1,600m/s and 1,500m/s, there is oblique incidence

angle of incidence = angle of refelction