Rad 117 - Chapters 4-7

Front 1

T/F
No matter where the orientation stickers or labels exist on a digital cassette the image will display correctly

Back 1

False

Front 2

Proper patient demographic input is the responisibilty of who?

Back 2

The tech (student tech)

Front 3

proper pt demographic input insures?

Back 3

Linking of all the patients files

Front 4

magnification on the entire image at the work station is termed what?

Back 4

zoom

Front 5

the input of annotation for id the pt left or right side should...

Back 5

should be used in conjuction with the technologist markers

Front 6

the workstation function that allows selection of preset terms and manual text input is termed what?

Back 6

annotation

Front 7

the process of joining 2 or more images into one continuous image is known as

Back 7

stitching

Front 8

the image reader scans and reads the image from the __________

Back 8

leading edge of the imaging plate to the opposite end

Front 9

what does shuttering do?

Back 9

cut out columnation (???? ) will have to look up to confirm better description.

Front 10

an image manipulation process that fills in the background so that it is darkened is?

Back 10

Shutter

Front 11

Brightness or darkness of an image is controlled by?

Back 11

Window

Front 12

image level perameters control image ________

Back 12

contrast

Front 13

the more manipulation of an image the greater the _______

Back 13

loss of information

Front 14

the inproper algorythm application may result in...

Back 14

repeat exams

Front 15

focal spot and OID affect image sharpness in film screen, digital imaging, or both?

Back 15

both

Front 16

changing the steepness of the exposure gradient (histogram)

Back 16

controls image contrast

Front 17

raw (I think that's what he said) shades were left in an image after processing the contrast would be.....

Back 17

too low

Front 18

exposure latitude for digital imaging is less than that of film screen imaging

Back 18

false

Front 19

the amount of error that can be made and still result in capture of quality image refers to

Back 19

latitude

Front 20

T/F
Automatic rescaling can be substitude for appropriate technical factors

Back 20

false

Front 21

automatic rescaling means that images are produced regardless of the amount of exposure with...

Back 21

uniform contrast and density

Front 22

in effort to display the pixels for the area of interest when the exposure is greater or less than what is needed to produce an image _______ occurs

Back 22

automatic rescaling

Front 23

T/F
image aliasing is similar to moire effect caused by grid error

Back 23

the test is False - know that the effect is the same, but the cause is different. it's a signal wrap around vs a grid that is under penetrated. (F)

Front 24

a wrap around image or image aliasing occurs when....

Back 24

sampling occurs less that twice per cycle

Front 25

the longer the image is stored in a CR cassette the _________

Back 25

the more energy lost by electrons

Front 26

too few pixels are sampled the result will be ________

Back 26

low resolution

Front 27

nyquis theorum states that the ......

Back 27

sampling frequency must be twice the input signal band width

Front 28

T/F
the shape of the histogram is anatomy specific

Back 28

true

Front 29

the higher the KVP the _______

Back 29

the narrower the histogram

Front 30

data collected w/in the collumator are represented by a _________

Back 30

histogram

Front 31

the main factor that limits the image quality in cassettless image acquisition is ...

Back 31

noise

Front 32

which of the following will increase resolution?

Back 32

large matrix; small pixels

Front 33

the larger the matrix the _______

Back 33

both A & B
the larger the image
more storage space is needed

Front 34

excessive digital processing can lead to...

Back 34

high noise

Front 35

which of the following has the greatest spacial resolution?

Back 35

film screen radiography

Front 36

T/F
the smaller the area of the TFT photodiodes the less radiation can be detected

Back 36

False

Front 37

the specialized pixels in a complimentry metal oxide silicone system are struck w/ xray photons

Back 37

all of the above:
*xray are converted into light
*light photons are stored in capacitors
*light photons are converted into electrical charges

Front 38

the indirected conversion detection system that requires optical coupling an imaging size reduction is known as a ....

Back 38

charged coupled device (CCD)

Front 39

the devise that acts like a camera in an indirect conversion detector is known as a.....

Back 39

charged coupled device (CCD)

Front 40

type of flat panel detector that uses thin films of silicon integreted with arrays of photodiodes is known as a ......

Back 40

immorphious silicone detector (Spelling?!?!?)

Front 41

flat panel detector that uses indirect conversion technology converts _______

Back 41

convert xrays to visible light

Front 42

device that includes photo sensitive array and small pixels that convert light into electrical charges is known as a __________ transister

Back 42

Thin Film (TFT)

Front 43

fine white lines appearing on hard copy of an image may be caused by?

Back 43

debris on the mirror in the laser printer

Front 44

to avoid the moire grid artifact the grid must be oriented _____ to the plate readers laser scan direction

Back 44

parallel

Front 45

horizontal white lines may be caused by

Back 45

dirt on the guide on the plate reader

Front 46

dark line artifacts can be caused by...

Back 46

scatter to the back of the cassette

Front 47

histogram is .....

Back 47

graphic representation of xray exposure

Front 48

in all systems exposures outside the range indicate....

Back 48

both over and under exposure

Front 49

in the Fuji system each change of exposure number of 200 is = to change by factor of

Back 49

2

Front 50

the S# of 400 in a Fuji system ______ the S# of 200

Back 50

1/2 the exposure

Front 51

T/F
with Fuji exposure indicators the lower the S# the higher the exposure

Back 51

False

Front 52

exposure indicator number is

Back 52

indication of radiation absorbed by the imaging plate

Front 53

technologist can lend credibilty to his/her expertise by

Back 53

using personal positioning markers

Front 54

T/F
possible (??) to replace columation with shuttering

Back 54

False

Front 55

which of the following require more critical beam centering

Back 55

focus grids

Front 56

grid ratio describes the

Back 56

relationship of height of lead strips interspace

Front 57

the number of grid lines per centimeter or inch describes a grids'

Back 57

frequency

Front 58

grid use for CR exams is more critical than in film screen radiography because CR....

Back 58

imaging plates record more densities

Front 59

moire artifacts results when grid lines and scanning laser are

Back 59

not parallel

Front 60

grid lines projected onto the imaging plate will not interfere w/ image T/F?

Back 60

False

Front 61

the higher the number of pixels in a matrix the ________

Back 61

the higher the image resolution

Front 62

T/F
using the wrong imaging plate size may result in a matrix w/ very small pixels

Back 62

False

Front 63

using an imaging plate that is much larger than the plate being examined will...

Back 63

decrease resolution

Front 64

T/F
backscatter from the cassette detector influences the amount of milliamprage (MA)necessary to create the image

Back 64

T

Front 65

quantum mottle is caused by?

Back 65

insuffecient light

Front 66

insufficient light is produced by the imaging plate phosphur the image will be....

Back 66

grainy

Front 67

milliamprage (MAS) is selected for the.....

Back 67

number of electrons needed

Front 68

less KV is needed w/ convential radiographic screens than is necessary for CR systems - T/F

Back 68

False

Front 69

the range of how much KV can be used w/ CR is?

Back 69

45-120

Front 70

KV should be chosen for....

Back 70

type and amount of contrast desired

Front 71

selection of the incorrect body part from the exam menu may result in...

Back 71

image misinterpretation

Front 72

cassette based spacial resulution is lower than conventional/ or regular film screen - T/F

Back 72

True

Front 73

the amount of detail present in any image is known as...

Back 73

spacial resolution

Front 74

the number of bits per pixels is known as bit...

Back 74

... bit depth

Front 75

each square in a matrix is called a

Back 75

picture element

Front 76

a CR imaging plates are erased by flooding the plate with?

Back 76

light

Front 77

according to the author imaging plates should be erased every ______

Back 77

week

Front 78

CR phosphor speed and radiographic film speed are always equivilent - T/F

Back 78

False

Front 79

which of the following does not determine CR resolution

Back 79

laser scan speed

Front 80

the process of scanning the moving imaging plate is known as

Back 80

translation

Front 81

the laser scans the imaging plate in a ____ pattern

Back 81

raster (left/ right; top/ bottom)

Front 82

the power source for the laser must be

Back 82

constant

Front 83

each light photon is assigned a number during

Back 83

digitization

Front 84

according to this author; what is the typical group cassette (???) per hour

Back 84

50

Front 85

the devise that moves the laser rapidly back and forth accross the imaging plate is known as

Back 85

beam optics

Front 86

the optical mirror in the reader does what?

Back 86

directs the laser beam to the imaging plate surface

Front 87

when the imaging plate is irradiated stimulated electrons enter the _______ layer

Back 87

conductive

Front 88

the phospor layer is made of phosphors from the _______ family.

Back 88

barium flourohalide

Front 89

the purpose of the barcode label is to identify the

Back 89

imaging plate

Front 90

the reflective layer does what?

Back 90

sends light in the forward direction

Front 91

the imaging plate layer that absorbs stimulating light and reflects emmitted light is the ______ layer

Back 91

color

Front 92

the layer of the imaging plate that traps electrons during the exposure is the ______ layer

Back 92

active

Front 93

which of the following serve to protect against static build up, dust collection and mechanical damage to the imaging plate

Back 93

felt material

Front 94

CR cassette is backed by aluminum that

Back 94

absorbs xrays