Chapter test 12/13

Question 1

TRUE OR FALSE

Lateral resolution does not improve with multi-focusing

Answer 1

False

Question 2

On the annular phased array transducer, which part of the beam is used for the information?

Answer 2

Focal zone

Question 3

100 x 1/1000 second= 1/10 second. What is this frame rate?

Answer 3

10 Hz

Question 4

Temporal resolution pertains to

Answer 4

accuracy in time

Question 5

Frame rate is determined by what 2 things

Answer 5

Sounds speed in the medium and the depth of imaging

Question 6

Rendering creates an image from ___________ data acquired during the ultrasound exam

Answer 6

3D

Question 7

When you excite the inner crystals and progressively excite the outer crystals to diminish lobe artifact, this is called

Answer 7

Apodization

Question 8

TRUE OR FALSE

The sonographer can control the number of pulses in each picture

Answer 8

True

Question 9

Sector size is also called

Answer 9

field of view

Question 10

A sonographer increases the line density from 1 line per degree of sector to 5 lines per degree of sector. What is the most likely consequence of the action?

Answer 10

Temporal resolution decreases

Question 11

The linear sequential array transducers have crystals that are _________ wavelength in width

Answer 11

1

Question 12

All of the following decrease temporal resolution except:

a. deeper focusing
b. multi focus
c. lower frame rate
d. Narrower sector

Answer 12

Narrower sector

Question 13

All of the following will cause low line density except:

a. fewer pulses per frame
b. tightly packed lines
c. higher frame rate
d. shorter T frame

Answer 13

Tightly packed lines

Question 14

What is the unit for frame rate?

Answer 14

Hz

Question 15

Which of the following is best described as mechanically steered and multi-focus:

a. Linear phased transducer
b. mechanical transducer
c. annular sequential array transducer
d. annular phased array transducer

Answer 15

annular phased array transducer

Question 16

TRUE OR FALSE

Temporal resolution is reduced when few images are displayed per second

Answer 16

True

Question 17

Is the sonographer able to change the spacing between sound beams

Answer 17

Yes

Question 18

TRUE OR FALSE

The image shape for a convex image will be rectangle

Answer 18

False

Question 19

With high line density, each image contains more detail, this is known as

Answer 19

Improved spatial resolution

Question 20

A linear phased array transducer has 128 crystals, How many of these crystals are fired to create a single sound beam?

Answer 20

128

Question 21

With a vector array images, the top of the image is

Answer 21

Flat

Question 22

TRUE OR FALSE

When one ring of the annular array transducer malfunctions, the entire image is lost

Answer 22

False

Question 23

Mechanical transducers have only one active element. The shape of the element resembles a

Answer 23

Coin

Question 24

TRUE OR FALSE
When one element in a linear sequential array is damaged, only the portion of the image extending directly below the damaged element is affected

Answer 24

True

Question 25

BONUS | What are the 5 functions of the ultrasound receiver?

Answer 25

1. amplification 2. compensation 3. compression 4. demodulation 5. reject