Chapter test 9-11

Question 1

What is the only display mode that provides information regarding reflector motion with respect to time?

Answer 1

M-mode

Question 2

What is another name for the near field

Answer 2

Fresnel zone

Question 3

TRUE OR FALSE

High frequency beams will provide less divergence

Answer 3

True

Question 4

TRUE OR FALSE

The sonographer can adjust the internal focus

Answer 4

False

Question 5

In M-mode, what is displayed in the x axis

a. depth
b. amplitude
c. time

Answer 5

Time

Question 6

When the beam becomes focused, it

Answer 6

has a focal zone that gets smaller

Question 7

Frequency and focal depth are__________ related

Answer 7

Directly

Question 8

Which of the display modes is mainly used for ophthalmology?

Answer 8

A-mode

Question 9

The diameter of the active element is 16mm, and the near zone length is 10cm, The focal zone is 6cm long.
What is the best estimate of the diameter or width of the sound beam as it exits the transducer?

Answer 9

16mm

Question 10

The diameter of the active element is 16mm, and the near zone length is 10cm, The focal zone is 6cm long.
At what depth is the focus?

Answer 10

10cm

Question 11

The diameter of the active element is 16mm, and the near zone length is 10cm, The focal zone is 6cm long.
What is the diameter of the sound beam at a depth of 10cm?

Answer 11

8mm

Question 12

The diameter of the active element is 16mm, and the near zone length is 10cm, The focal zone is 6cm long.
At which of the following depth is the beam widening?
a. 4cm
b. 11.64cm
c. 6cm
d. 9cm

Answer 12

11.64cm

Question 13

With A-mode, what is displayed on the y-axis

Answer 13

amplitude of the reflected signal

Question 14

Lateral resolution is best at the

Answer 14

focus

Question 15

Axial resolution is also called

a. range
b. lateral
c. angular
d. transverse

Answer 15

Range

Question 16

Which crystal will improve lateral resolution in the far field?

a. small
b. large

Answer 16

large

Question 17

The M-mode appears as a group of

Answer 17

Horizontal wavy lines

Question 18

With B-mode, which axis is related to the strength of the reflections>

Answer 18

Z axis

Question 19

Does axial resolution change?

Answer 19

No

Question 20

If there are more cycles in a pulse, the numerical value of radial resolution is more, less or the same?

Answer 20

More

Question 21

The smaller diameter PZT beam will create?

Answer 21

Lower frequency and shallow focus

Question 22

Small sound sources that create V-shaped beams that are inconsistent between large and small is a principle called the _________ principle

Answer 22

Huygen’s

Question 23

Which display mode is used primarily to assess the motion of cardiac walls?

Answer 23

M-mode

Question 24

With A-mode what is displayed of the x axis?

Answer 24

Depth

Question 25

The larger diameter PZT beam will create?

Answer 25

Higher frequency and deep focus

Question 26

TRUE OR FALSE | The diameter of ceramic and frequency of sound determine sound beam

Answer 26

True

Question 27

Which focus is the most common form of fixed focusing?

Answer 27

Internal

Question 28

Axial resolution ranges from

Answer 28

.1 to 1.0mm

Question 29

Transducer diameter and focal depth are ___________ related

Answer 29

Directly

Question 30

Which of the following terms does not belong? a. Fraunhofer b. focal point c. focus d. end of the near zone

Answer 30

Fraunhofer

Question 31

A pair of 8MHz probes are identical except for the element diameter. The active element diameters are 6mm and 12mm, respectively. The sound beam of which probe will have a shallower focus? a. 6mm b. 12mm

Answer 31

6mm

Question 32

When displayed on an oscilloscope, the amplitude information of a B-mode is routed in the

Answer 32

Z axis

Question 33

Lateral resolution equals

Answer 33

Beam diameter

Question 34

TRUE OR FALSE Axial resolution measures the ability of a system to display two structures that are very close together when the structures are parallel to the sound beam's main axis

Answer 34

True

Question 35

Which display mode was the first form of gray scale imaging?

Answer 35

B-mode

Question 36

An A-mode display looks like

Answer 36

Skyline

Question 37

In soft tissue, a 4 cycle , 2 MHz pulse has a pulse length equal to 5mm. What is the axial resolution?

Answer 37

1.54mm

Question 38

Lateral resolution is improved in the far field the best with?

Answer 38

Higher frequency sound beams

Question 39

Lateral resolution is also called a. range b. axial c. transverse d. depth

Answer 39

transverse

Question 40

Crystal diameter and beam divergence are __________ related

Answer 40

Inversely

Question 41

TRUE OR FALSE | The sonographer can change the location of the focus with modern ultrasound systems

Answer 41

True

Question 42

TRUE OR FALSE | The focal point is the region around the focus where the beam is relatively narrow?

Answer 42

False

Question 43

Which display mode has an invisible dot that moves across the system's display and with that brightness of the dot will indicate the strength of the reflection?

Answer 43

B-mode

Question 44

The sound beam exits the probe and immediately enters the _____________ zone

Answer 44

Fresnel

Question 45

TRUE OR FALSE | Small transducer diameters produce a beam with less divergence

Answer 45

False

Question 46

When the number of cycles in a pulse increases while the frequency remains the same, the image quality IMPROVES, DEGRADES, OR REMAINS THE SAME?

Answer 46

Degrades

Question 47

TRUE OR FALSE | Fixed array means fixed focusing

Answer 47

False

Question 48

Lateral resolution is imaged best in the near field with a SMALL or LARGE diameter crystal?

Answer 48

SMALL

Question 49

TRUE OR FALSE | Axial and lateral resolution are measured in distance

Answer 49

True

Question 50

Which of the following probes creates a beam with the most divergence: a. 4mm diameter, 4MHz b. 6mm diameter, MHz c. 4mm diameter, 2MHz d. 5mm diameter, 8MHz

Answer 50

c. 4mm diameter, 2MHz