Chapter 4

Question 1

A- Mode

Answer 1

Mode of operation in which the display presents echo amplitude versus depth

Question 2

Amplification

Answer 2

The process by which small voltages are increased to larger ones

Question 3

Amplifier

Answer 3

A device that accomplishes amplification

Question 4

Analog

Answer 4

Related to a procedure or system in which data are represented in proportional continuously variable physical quantities

Question 5

Analog to Digital Converter

Answer 5

A device that converts voltage amplitude to a number

Question 6

B-Mode

Answer 6

Mode of operation in which the display presents a spot of appropriate brightness for each echo received by the transducer

Question 7

B Scan

Answer 7

A B-mode image that represents an anatomic cross section through the scanning plane

Question 8

Bandpass filter

Answer 8

An electronic device or circuit that allows signals between two specific frequencies to pass, but that discriminates against signals at other frequencies

Question 9

Beam Former

Answer 9

The part of an instrument that accomplishes electronic beam scanning, apodization, steering, focusing and aperture with arrays

Question 10

Bistable

Answer 10

Having 2 possible states

Question 11

Bit

Answer 11

Binary digit

Question 12

Channel

Answer 12

A single 1 or 2 way path for transmitting electric signals, in distinction of other parallel paths.

Question 13

Cine Loop

Answer 13

Sequential display of all the frames stored in memory at a controllable frame rate

Question 14

Coded Excitation

Answer 14

A sophisticated form of transmission in which the driving voltage pulses have intrapulse variations in amplitude, frequency, and or phase

Question 15

Compensation

Answer 15

Equalization of received echo amplitude differences caused by different attenuations for different reflector depths

Question 16

Compression

Answer 16

Reduction indifference in small and large amplitudes

Question 17

Contrast Resolution

Answer 17

Ability of a gray scale display to distinguish between echoes of slightly different intensities

Question 18

Demodulation

Answer 18

Detection

Question 19

Depth Gain Compensation

Answer 19

See Compensation

Question 20

Detection

Answer 20

Conversion of voltage pulses from radio frequency to to video form

Question 21

Digital

Answer 21

Procedure or system in which data are represented in numeric value

Question 22

Digital to Analog Converter

Answer 22

A device that converts a number to a proportional voltage amplitude

Question 23

Display

Answer 23

A device that presents a visual image derived from voltages received from an image processor

Question 24

Dynamic Range

Answer 24

Ratio of largest to smallest power that a system can handle

Question 25

Elastography

Answer 25

Imaging tissue stiffness by tracking movement under mechanical stress

Question 26

Flat Panel Display

Answer 26

A back-lighted rectangular matrix of thousands of crystal display elements

Question 27

Frame

Answer 27

A single image produced by 1 complete scan of the sound beam

Question 28

Frame Rate

Answer 28

of frames of echo info stored each second

Question 29

Freeze Frame

Answer 29

Constant display of one of the frames in memory

Question 30

Gain

Answer 30

Ratio of amplifier output to input electric power

Question 31

Gray Scale

Answer 31

Range of brightness between white and black

Question 32

Image Memory

Answer 32

The part of the image processor where echo information is stored in image format

Question 33

Image Processor

Answer 33

An electronic device that manipulates and prepares images for visual presentation

Question 34

Lateral Gain Control

Answer 34

Gain controls that enable different gain values to be applied laterally across an image to compensate for different attenuation values in anatomic regions

Question 35

M-Mode

Answer 35

A B-mode presentation of changing reflector position versus time

Question 36

Panoramic Imaging

Answer 36

The extension of the field of view beyond the normal limits of a transducer scan plane

Question 37

Persistence

Answer 37

Averaging sequential frames together

Question 38

PACS

Answer 38

The system provides means or electronically communicating images and associated information to work stations and devices external to the ultrasound instrument.

Question 39

Pixel

Answer 39

Picture element

Question 40

Post Processing

Answer 40

Image processing done after storage in the memory

Question 41

Pre Processing

Answer 41

Signal and image processing accomplished before storage in memory

Question 42

Radio Frequency

Answer 42

Voltages representing echoes in cyclic form

Question 43

Real Time

Answer 43

Imaging with a rapid frame sequence display

Question 44

Real Time Display

Answer 44

A display that appears to image moving structures or a changing scan plane continuously

Question 45

Refresh Rate

Answer 45

The number of times each second that info is sent from the image memory to the display

Question 46

Scan Line

Answer 46

A line produced on a display that represents ultrasonic echoes returning from the body

Question 47

Scanning

Answer 47

The sweeping of a sound beam through the anatomy to produce an image