Question 1

The location of each dot corresponds to the ________ of the echo to return.

Accepted Answer

The location of each dot corresponds to the anatomic location of the echo-generating structure.

Question 2

Sonography is medical anatomic imaging using a ________ technique.

Accepted Answer

Anatomic imaging with ultrasound is accomplished by the pulse-echo principle.

Question 3

The brightness of the dot corresponds to the ________ of the returning echo.

Accepted Answer

The brightness of the dot corresponds to the echo strength,producing what then is known as a gray-scale image.

Question 4

Animals have applied ultrasound to detect and capture prey.

Accepted Answer

Bats,dolphins,and other animals use ultrasound to detect,locate,determine motion of,and capture prey; to avoid obstacles; to detect and avoid predators; and to court mates.

Question 5

A ________ scan is shaped like a slice of pie.

Accepted Answer

A sector image is shaped like a slice of pie.

Question 6

Vertical parallel scan lines are seen with which transducer format?

Accepted Answer

A linear transducer generates vertical parallel scan lines.

Question 7

Sonographic images are composed of many ________.

Accepted Answer

Sonographic images are composed of many scan lines (pulses).

Question 8

The Doppler effect is a change in echo ________.

Accepted Answer

The Doppler effect is a change in frequency caused by moving objects.

Question 9

Doppler ultrasound measures the movement of ________.

Accepted Answer

Doppler ultrasound is used in detecting and measuring tissue motion and blood flow.

Question 10

Three-dimensional imaging requires many adjacent tissue ________ to build the image.

Accepted Answer

Three-dimensional,or volume,imaging requires scanning the ultrasound through many adjacent two-dimensional tissue-cross-sections to build up a three-dimensional volume of echo information.

Question 11

Color Doppler imaging is superimposed on a gray-scale image.

Accepted Answer

Rapid scanning and processing of the Doppler data enable color-coded presentation of Doppler information to be superimposed on a gray-scale anatomic image.

Question 12

A gray-scale ultrasound image is the visible counterpart of a/an ________.

Accepted Answer

An ultrasound image is the visible counterpart of an invisible object,produced in an electronic instrument by the interaction of ultrasound with the object.

Question 13

One pulse of ultrasound generates a single scan line as it travels through tissue.

Accepted Answer

One line of echo information (pulse) is equal to one scan line.

Question 14

A rectangular image display is seen when using a ________ transducer.

Accepted Answer

Pulses (scan lines) travel from different points parallel with each other,displaying a rectangular image.

Question 15

Diagnostic ultrasound transducers generate a ________ of sound into the body.

Accepted Answer

Diagnostic ultrasound transducers generate the ultrasound pulses and receive the returning pulses.

Question 16

Echoes produced by ________ objects have different ________ than the pulses sent into the body.

Accepted Answer

Echoes produced by moving objects have different frequencies than the pulses sent into the body.

Question 17

Pulsed ultrasound transducers can generate only ultrasound pulses.

Accepted Answer

The transducer generates the ultrasound pulses and receives the returning echoes.

Question 18

The Doppler effect is caused by a difference in the depth of two moving objects.

Accepted Answer