Chapter 15

Question 1

the source of the x-ray beam in an x-ray tube

Answer 1

anode target

Question 2

device used to decrease scatter radiation

Answer 2

grip

Question 3

general amount of blackness in a radiographic image

Answer 3

density

Question 4

electromagnetic radiation of shorter wavelength than light

Answer 4

x rays

Question 5

source of x rays in a dental or portable x ray machine

Answer 5

stationary anode

Question 6

the distance between the source of x ray and image receptor

Answer 6

focal film distance

Question 7

range of shades of grey allowing both bone and soft tissues to be seen at the same exposure setting

Answer 7

dynamic range

Question 8

weakening of sound waves as they enter the body

Answer 8

attenuation

Question 9

device used to make grid lines invisible

Answer 9

potter bucky diaphragm

Question 10

decrease in the strength of the x ray beam near the anode

Answer 10

heel effect

Question 11

current applied to the cathode filament

Answer 11

milliamperage

Question 12

ability to distinguish two adjacent structures on an image

Answer 12

spatial resolution

Question 13

energy that breaks chemical bonds and damages dna

Answer 13

ionizing radiation

Question 14

serves as stationary source of x ray beams

Answer 14

rotating anode

Question 15

difference between blacks and whites in an image

Answer 15

contrast

Question 16

source of electrons in x ray tube

Answer 16

cathode

Question 17

sharpness of radiograph

Answer 17

detail

Question 18

dark structure on radiograph

Answer 18

anechoic

Question 19

b mode

Answer 19

brightness mode

Question 20

radiograph made with cassette

Answer 20

computed radiography

Question 21

radiograph uploaded digitally to a computer

Answer 21

digital radiograph

Question 22

diagnostic imaging technique used to image moving structure

Answer 22

fluoroscopy

Question 23

structure that produces more echoes than surrounding structures

Answer 23

hyperechoic

Question 24

measurement of sound frequency

Answer 24

Hz

Question 25

structure that has the same brightness as adjacent structures in an ultrasound

Answer 25

isoechoic

Question 26

m-mode

Answer 26

motion mode

Question 27

computer system used to permanently store and transmit digital images to different computers within a single location or between locations

Answer 27

PACS

Question 28

measurement of absorbed radiation that takes into account biological effectiveness of radiation

Answer 28

gray

Question 29

unit of absorbed dose of ionizing radiation

Answer 29

sievent

Question 30

changing kVp from 50 to 60, changing the focal film distance, removing grid

Answer 30

increases radiologic density

Question 31

changing mA from 300 to 200, changing exposure from 1/2 s to 1/4 s

Answer 31

decreased radiologic density

Question 32

changing objective film distance from 6 to 12 inches, changing from detail screens to fast screens

Answer 32

does not change density

Question 33

reflection of beam when encounters air or gas

Answer 33

reverberation artifact

Question 34

layered appearance when US beam cuts through edge of cystic structure and solid tissue

Answer 34

shadowing

Question 35

area of darkness resulting from inadequate sound beam penetration through highly reflective or absorbing tissue

Answer 35

acoustic enhancement

Question 36

refraction or redirection of the sound beam helpful in identifying round structures

Answer 36

edge artifact

Question 37

duplication of an image as a result of reverberation

Answer 37

mirror-image artifact

Question 38

when ultrasound beam passes through structure with low attenuation

Answer 38

slice-thick artifact

Question 39

part where x ray exits tube

Answer 39

window

Question 40

part produces electron cloud when current in applied

Answer 40

filament

Question 41

high voltage circuit controls electrical potential between cathode and this part

Answer 41

anode

Question 42

part that encases other parts of the tube

Answer 42

glass envelope

Question 43

x rays do not emanate from this negatively charged pole

Answer 43

cathode

Question 44

part that directs electrons towards anode

Answer 44

focusing cup

Question 45

electrons directly impact this part to produce x ray

Answer 45

anode target

Question 46

the shorter the wavelength of rays...

Answer 46

the greater the energy and penetration

Question 47

kV controls what

Answer 47

electrical potential between cathode and anode

Question 48

where electrons impact anode

Answer 48

"target"

Question 49

photostimulable phosphor plate is used for what

Answer 49

compound radiography