SPI Exam Flash Cards Set #3

Question 1

What statement about doppler is not true

Answer 1

doppler color has slower velocities that are represented by lighter hues

Question 2

What happens to the ultrasound beam beyond the critical angle

Answer 2

100% reflected

Question 3

The range equation relates

Answer 3

distance, velocity and time

Question 4

What type of transducer is composed of multiple ring shaped elements

Answer 4

annular

Question 5

Without interpolation, what would best describe the resultant Bmode image

Answer 5

a series of scan lines with blank data between the lines

Question 6

If the gain of an amplifier is 18 dB, what will the new gain setting be if the gain setting is reduced by one half

Answer 6

15dB

Question 7

What is the most common result of high integrity ultrasound

Answer 7

heat

Question 8

Lateral resolution is equal to

Answer 8

beam diameter

Question 9

What type of noise arises from small amplitude sound waves that interfere with each other

Answer 9

speckle

Question 10

An individual is supine. The blood pressure generated by the heat is 120 mmHh. What is the hydrostatic pressure at the ankle

Answer 10

0mmHg

Question 11

An individual is standing. The blood pressure generated by the heat is 120mmHg. What is the hydrostatic pressure at the ankle

Answer 11

100mmHg

Question 12

Turbulent flow is most likely to occur in what situation

Answer 12

high velocities and acute anemia

Question 13

The hydrophone is made up of

Answer 13

small transducer elements

Question 14

Lamda symbol represents

Answer 14

wavelength

Question 15

Power is defined as energy per unit

Answer 15

time

Question 16

Rayleigh scattering occurs if the particle dimensions are

Answer 16

less than the wavelength

Question 17

Specular reflection occurs when

Answer 17

the reflector surface is large and smooth relative to the wavelength

Question 18

Axial resolution is also known as

Answer 18

depth, range, longitudinal, radial

Question 19

What arranges media in terms progagation velocity, from lowest to highest

Answer 19

air, fat, muscle, bone

Question 20

The amount of dispersion in the far field of an ultrasound beam can be decreased by

Answer 20

using a larger diameter transducer

Question 21

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

Answer 21

the pulse duration is increased

Question 22

The near zone length of a transducer depends on

Answer 22

frequency and transducer diameter

Question 23

The type of compressional wave in which the particles move back and forth parallel to the direction of wave propagation is know as

Answer 23

longitudinal wave

Question 24

The interpreting physician has asked you to use a stand off pad to evaluate a superficial mass. What is the main advantage the stand off provides to improve the image

Answer 24

increases distance between the transducer and the mass, making it more likely that the mass will be located close to the elevational focus of the sound beam

Question 25

What best describes a vector array transducer

Answer 25

electronic steering, electronic focusing, trapezoidal shaped image

Question 26

What best describes the empirical approach to the study of bioeffects

Answer 26

exposure-response

Question 27

What ultrasound method requires two active elements mounted side by side

Answer 27

CW doppler

Question 28

Changes in the doppler shift frequency within a color flow image sample site appear in the image as

Answer 28

different colors (hues) or different levels of saturation (purity)

Question 29

Dynamic focusing

Answer 29

is made possible by array based systems

Question 30

A 7.5 MHz transducer is used on a patient with the ultrasound wave propagatinf warious tissues listed below. What will have the shortest wavelength

Answer 30

lungs

Question 31

What type of resolution degraded in the presence of grating lobes and side lobes

Answer 31

lateral

Question 32

Adjusting the overall gain will increase or decrease the brightness of the image due to

Answer 32

amplification of the receiver voltage

Question 33

The image on an ultrasound system's display is too bright. What technique is best to correct this problem

Answer 33

decrease output power

Question 34

An echo that has undergone an attenuation of 3 dB will have an intensity that is _____ that its initial intensity

Answer 34

two times smaller

Question 35

What is an advantage of single crystal or pure wave crystal transducers

Answer 35

wide bandwidth

Question 36

The range equation relates

Answer 36

distance, velocity, time

Question 37

The reverse piezoelectric effect can be best described as

Answer 37

mechanical deformation of ultrasound crystal that results from a high voltage applied across the crystal thickness

Question 38

Frequency is a significant factor in

Answer 38

tissue attenuation

Question 39

Increasing the frequency of an ultrasound longitudinal wave will result in what change in the velocity of the wave

Answer 39

no change

Question 40

An artifact that would least likely produce a pseudo mass is

Answer 40

comet tail artifact

Question 41

Spatial compounding improves the quality of the image in several ways except

Answer 41

creating multiple images in a single angle