Digital imaging week 3 terms

Question 1

adjusting brightness and contrast

Answer 1

windowing

Question 2

what controls the contrast

Answer 2

window width

Question 3

what type of relationship between window width and contrast

Answer 3

inverse relationship

Question 4

what controls the brightness (density)

Answer 4

window level

Question 5

what type of relationship between window level and density

Answer 5

direct relationship

Question 6

brightness values of adjacent pixels can be brought closer together

Answer 6

smoothing

Question 7

all or part of image can be magnified

Answer 7

magnification

Question 8

brightness can be increased along edge to increase visibility

Answer 8

Edge enhancement

Question 9

removal of background anatomy to allow visualization of contrast enhanced anatomy

Answer 9

subtraction

Question 10

dark and light pixel values are reversed

Answer 10

image reversal

Question 11

adding text to an image

Answer 11

annotation

Question 12

highly complex mathematical formulas applied to a data set for digital imaging

Answer 12

algorithm

Question 13

representative of the number of shades of gray that can be demonstrated by each pixel, determined by the manufacturer based on the imaging procedures the equipment is required for, most common available are 10, 12 & 16

Answer 13

Bit-depth

Question 14

the intensity of light that represents the individual pixels in the image on the monitor

Answer 14

Brightness

Question 15

solid state device that converts visible light photons the electrons

Answer 15

CCD charge coupled device

Question 16

a method of acquiring radiographic images digitally;

Answer 16

computed radiography (CR)

Question 17

CR’s main components

Answer 17

PIP
IP reader
tech workstation

Question 18

an imaging system’s ability to distinguish between similar tissues

Answer 18

contrast resolution

Question 19

a method of acquiring radiographic images digitally; DR detector replaces the film screen system and the CR IP as the image receptor

Answer 19

Digital Radiography

Question 20

series of “boxes” that give form to the image

Answer 20

Display matrix

Question 21

pixel size of the monitor related to the display matrix

Answer 21

display pixel size

Question 22

post processing technique that increases brightness along the edges of structures on an image to increase the visibility of the edges

Answer 22

edge enhancement

Question 23

numeric value that is representative of the exposure the IR received in digital radiography

Answer 23

exposure index

Question 24

range of exposure factors that will produce an acceptable image

Answer 24

exposure latitude

Question 25

the image matrix size provided by digital x-ray imaging systems

Answer 25

field of view

Question 26

computer system designed to support and integrate the operations of the entire hospital

Answer 26

hospital information system

Question 27

random disturbance that obscures or reduces clarity in a radiographic image, grainy or mottled appearance

Answer 27

noise

Question 28

picture element, an individual component of a matrix

Answer 28

pixel

Question 29

changing or enhancing the electronic image in order to view it from a different perspective or improve its diagnostic quality

Answer 29

post processing

Question 30

computer system that supports the operations of a radiology department

Answer 30

(RIS) Radiology Information System

Question 31

random access memory (temporary)

Answer 31

RAM

Question 32

read only memory (permanent)

Answer 32

ROM

Question 33

a post processing technique that adjusts brightness values of adjacent pixels closer together

Answer 33

smoothing

Question 34

the electronic transmission of diagnostic imaging studies from one location to another for the purposes of interpretation and/or consultation

Answer 34

Telaradiology

Question 35

the user adjusting the window level and window width (image contrast and brightness)

Answer 35

windowing

Question 36

controls the brightness of a digital image

Answer 36

window level

Question 37

controls the range of gray levels of an image

Answer 37

Window width

Question 38

final phase of image processing in digital during which the computer compares the image histogram with the selected LUT and applies to the raw data to align the image histogram with the LUT

Answer 38

Auto rescaling

Question 39

post processing that adds a black background around the exposure field providing a perceived enhancement of image contrast

Answer 39

shuttering