Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

DMSO Physics 2 > SPI Review > Flashcards

SPI Review Flashcards

(100 cards)

Start Studying
1
Q

reciprical of .001

A

1000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

reciprical of 1/10

A

10

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

how much bigger is one billion than one thousand

A

1,000,000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what happens to the period of a wave as it proagates

A

it remains the same

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

acoustic propagation properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

m/s (1.54)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is the freq of a wave with 1msec period

A

1khz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the distance covered by one cycle

A

wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

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

A

range resolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

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

A

0.15 mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

faster

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

25

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

halved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is the minimum value of duty factor

A

0%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

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

A

slower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

6db

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

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

A

bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what is the approxomate attenuation coefficient of 1

A

0.5dB/cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

ipedance is the ____ of _______ and ________

A

product, prpagation speed, density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

freq, MHz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

as the impendances of 2 media become vastly different the

A

reflection increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

oblique incidence

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

refraction only occurs if there are

A

obligue incidence and diff propagation speeds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

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

A

non of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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
31
t or f, doppler shifts always occur if the sound source and receiver are in motion
f
32
which of the following is associated with power mode doppler? poor temporal resolution and flash artifact, lower sensitivity and good temporal resolution, high sensiticity and high frame rates, flash artifact and reduced sensitity, good temporal resolution and flash artifact
poor temporal res and flash artifact
33
the doppler shift is a measure of
difference between incident and refelcted freq
34
in an analog scan concerter what component stores the image data
dielectric matrix
35
t or f, shadowing may result from high amounts of reflection of US energy
t
36
typical vaule of a period
.06 to .5 micro sec
37
period is
the time to complete a single cycle, start of one cycle to start of the next, units are time
38
frequency is
number of certain events that occur in a particular time duration
39
typical freq in US
2MHz to 15MHz
40
US freq
> 20,000Hz
41
audable
20Hz to 20,000Hz
42
infrasound
43
amplitude
the difference between the average value and the max value of an acoustic variable
44
units of amplitude
those of the acoustic variables
45
power
the rate that work is perfomred or the rate of energy transfer
46
units for power
watts
47
rlationship between power and amplitude
power is proportional to the waves amplitude squared
48
intenisty
the concetration of energy in a sound beam
49
how to calculate intensity
the beams power divided by the beams cross sectional area
50
units of intensity
watts/cm squared
51
intensity is directly related and proportional to
power
52
how to calculate intensity
amplitude squared
53
what is the lenghth or distance of a single cycle
wavelength
54
wavelength is determined by
both the sound source and the medium
55
typical value of wavelength in soft tissue
o.1 to 0.8 mm
56
how to calculate wavelength
wavelength = prop speed / freq
57
average speed of sound in soft tissue
1.54km/s = 1.540m/s = 1.54mm/micro sec
58
sound in a slow medium as a ______ wavelength
short
59
sound in a fast medium as a _______ wavelength
long
60
bulk modulus is the same as
stiffness
61
equeation for speed
speed = freq x wavelength
62
if the intensity remains the same while the power is doubled, what happends to the beam area
doubled
63
which of the following waves will have the shortest wavelength? low freq in a fast medium, low freq in a slow medium, high freq in a fast medium, high freq in a slow medium
high freq in a slow medium
64
a collection of cycles that travel together
pulse
65
the time from the start of a pulse to the end of that pulse (actual time that that pulse is on)
pulse duration
66
typical valuse of pulse duration in US
0.5 to 3 micro secs
67
in US a pulse is comprised of _______ cycles
2 to 4 cycles
68
pulse duration equation
of cycles in a pulse x perior or of cycles in a pulse / freq (MHz)
69
pulse repetition period is
time from the sart of one pulse to the start of the next pulse
70
typical values for PRP
100 micro sec to 1 msec
71
PRP is directly related to
imaging depth
72
PRF is
the number of pulses that occur in one sec, unit is Hz
73
typical PRF valuse in US
1 to 10kHz
74
PRF is inversly related to
imaging depth
75
duty factor is
the % of time that the system transmits sound
76
shallow imaging
high PRF high duty factor short PRP
77
deep imaging
low PRF low duty factor long PRP
78
spatial pulse length is
the length or distance that an entire pulse occupies in space. The distance from the start to the end of one pulse
79
spatial pulse length determines ________ resolution
axial | shorter pulses create higher quality images
80
typical value for spatial pulse length
0.1 to 1mm
81
def of intensity
the concentration of power in a beam
82
peak
max value
83
average
mean value
84
spatial
distance or space
85
temporal
all time, transmit and receive
86
pulse
only time pulse exists, transmit time
87
most important intensity regarding bioeffects
SPTA
88
_______ can be reported in various ways in respect to time and space
intensities
89
intensity in the key parameter in regards to
bio effects
90
3dB is ___ bigger
two times bigger
91
10dB is _____ bigger
ten times bigger
92
a signals power increases from 1 watt to 100 watts, express in dB
100dB
93
100% pwer with 0dB change setting to 25% what are the dB
-6dB
94
unit for attenuation
dB
95
total attenuation increases with
higher freq and longer path length
96
three componenets of attenuation
reflection absortion scattering
97
attenuation in ______ is similar to soft tissue
blood
98
types of reflection
specular-smooth surface, back in one direction diffuse or backscatter-rough boundry same size as wavelength rayleigh- irregular boudary smaller than wavelength
99
rayleigh scattering
chaotically redirected in all directions, higher freq more rayleigh, related to freq
100
what would cause rayleigh scattering
red blood cell

DMSO Physics 2 (26 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions