Final Part 3

Question 1

What is the elimination of
voltages that do not exceed a
certain level?

a. amplification
b. decompensation
c. reject
d. demodulation

Answer 1

c. reject

Question 2

What is the Fraunhofer?
a. focus
b. nearzone
c. far zone
.d penetration depth

Answer 2

c. far zone

Question 3

What are the units of lateral resolution

a. Hertz
b. Rayls
c. m/s
d. feet

Answer 3

d. feet

Question 4

Which of the following is the
best lateral resolution?

a. 15 mm

b. 6m

c. 0.06 cm

d. 2 c m

Answer 4

c. 0.06 cm

Question 5

If the spatial pulse length is 10 mm, what is axial resolution

a. 0.5 cm

b. 5 cm

c. 10 mm

d. 1cm

Answer 5

a. 0.5 cm

Question 6

If the frequency is decreased
the numerical value of the
radial resolution is

a. increased
b. decreased

c. unchanged

Answer 6

a. increased

Question 7

A transducer —— one form——
to other.

Answer 7

Converts, energy

Question 8

Which of these boudaries will
create the strongest reflection?

a. air-lung
b. -air-soft tissue
c. air-blood
d. soft tissue-blood

Answer 8

b. -air-soft tissue
d. soft tissue-blood

Question 9

Which of these boudaries wil create the strongest reflection?
a. air-lung
b. air-soft tissue
c. air-blood
d. soft tissue-blood

Answer 9

b. air-soft tissue
d. soft tissue-blood

Question 10

Identify one of the advantages
of coded excitation.

a. penetration
b. improved lateral resolution
c. improved temporal resolution
d. shorter pulse repetition period

Answer 10

penetration

Question 11

What is the meaning of a thermal index = 3?

a. tissue temperature may rise 3 degrees Farenheit
b. tissue temperature will rise 3degree Celsius
c. tissue temperature may rise 3 degrees Celsius
d. microbubbles 3mm in diameter will burst

Answer 11

c. tissue temperature may rise 3 degrees Celsius

Question 12

The creation of an image by scanning from different angles best describes

.a spatial compounding
b. fil-ininterpolation
c. Phase quadature
d. persistance

Answer 12

.a spatial compounding

Question 13

you enter a room only to find the patient does not speak English. Which of the following you do first?

a call for a hospital
interpreter
b. use sign language
c.obtain itfromabilingual family member who is ni
the room
d. point ot the signature line
of the consent form and
have hte patient sign ti

Answer 13

a call for a hospital
interpreter

Question 14

You enter a hospital room to perform an ultrasound exam. Which of the following should you do first?

Answer 14

d. check the patient identification

Question 15

Which of the following has the greatest output intensity?

a. b-mode
b. gray scale imaging
c. CW doppler
d. pulsed Doppler

Answer 15

d. pulsed Doppler

Question 16

Where does coded excitation originate?

a. the demodulator
b. the flux capacitor
c. the transducer
d. the pulser

Answer 16

d. the pulser

Question 17

Al of the following are true of
normal cavitation EXCEPT:

a. harmful bioeffects are commonly observed
b. it is also known as inertial cavitation
.c only a 10% increase in pressure is needed to convert to this from stable cavitation
d. temperatures ni the thousands of degrees are c r e a t e d
.e it si consistent with shock w a v e s

Answer 17

a. harmful bioeffects are commonly observed

Question 18

identify one of the advantages of coded excitation.

a. improved contrast resolution
b. improved lateral resolution
c. improved temporal
resolution
d. shorter pulse repetition period

Answer 18

a. improved contrast resolution

Question 19

The consolidation of many images into a single frame best describes which of the following?
a. dynamic range
b. fill-in interpolation
c. phase quadrature
d. persistence

Answer 19

d. persistence

Question 20

The interaction of microscopic bubbles and ultrasound form the basis for cavitation
bioeffects. Which of the
following forms of cavitation
are most likely to produce microstreaming in the intracellular fluid and s h e a r stresses?

a. stable cavitation
b. normal cavitation c. transient cavitation d. inertial cavitation
e, active cavitation

Answer 20

a. stable cavitation

Question 21

Which of the following best describes the empirical approach to the study of bioeffects?

a. exposure-response
b. cause-effect
c. risk-benefit
d. causation-reaction
e .effect-microstreaming

Answer 21

a. exposure-response

Question 22

Which of the following best describes the
mechanistic
approach to the study of bioeffects?

a. cause-effect
b. exposure-response
c. risk-benefit
d. causation-reaction
e. effect-microstreaming

Answer 22

a. cause-effect

Question 23

Which of the following is associated with cavitation?

a. thermal index
b. Snell’s Law
c. Avagadro’s Number
d. mechanical index

Answer 23

d. mechanical index

Question 24

The Fresnel is the:

a. focus
b. near zone
c. farzone
d. penetrationdepth

Answer 24

b. near zone

Question 25

How many data bits are needed to represent 46 gray shades? a. 46 b. 5 C. 6 d. 8

Answer 25

C. 6

Question 26

If wires in an AIUM test object do not appear in the same place as on the display, what is amiss? a. registration accuracy b. dynamic range accuracy .c near gain d. gray scale dynamic range

Answer 26

a. registration accuracy

Question 27

The propagation speed of US in the AUIM test object is: a. 1m/s b. 1.54 m/s c. 1.54 mm/us d. 1 km/s

Answer 27

c. 1.54 mm/us

Question 28

Enhancement, multipath and side lobes result in: a. image distortion b. clearer images c. artifact d. resolution problems

Answer 28

c. artifact

Question 29

(True or False) A mirror image artifact can appear along side of the true anatomy.

Answer 29

F

Question 30

Rectification and smoothing are components of which of the following. a. amplification b. decompensation c. reject d. demoulation

Answer 30

d. demodulation

Question 31

The more pixels per inch: a. the better the temporal resolution b. the better is the spatial resolution c. more shades of gray d. the higher the reliability

Answer 31

b. the better is the spatial resolution

Question 32

The more bits per pixel: a. the better the resolution b. the higher the pixel density c. the more shades of gray d. higher reliability

Answer 32

c. the more shades of gray

Question 33

The digital scan converter has a number of pixels assigned to each bit.

Answer 33

F

Question 34

Lateral resolution can be improved by: a. increasing gain b. decreasing gain c. focusing d. smoothing

Answer 34

c. focusing

Question 35

At the focus, the beam d i a m e t e r i s -------- the transducer diameter a. equal to b. half c. double d. one-fourth

Answer 35

b. half

Question 36

If we increase the transducer diameter, the beam diameter in far zone a. increased b. decreased c. unchanged

Answer 36

b. decreased

Question 37

If the transducer diameter increases, the lateral resolution at the smallest dimension is a. increased b. decreased c. unchanged

Answer 37

a. increased

Question 38

If we increase the freq the near zone length is a. increased .b decreased c. unchanged

Answer 38

a. increased

Question 39

Which is not a part of a transducer? a. active crystal b. matching layer c. A/D converter d. wire

Answer 39

c. A/D converter

Question 40

What is the production of a voltage from deformation a. piezoelectricity b. impedence c. cogeneration d. flux

Answer 40

a. piezoelectricity