Cassette Based Image Acquisition

Front 1

Selection of the incorrect body part from the examination menu may result in _____

Back 1

image misinterpretation

Front 2

kilovoltage peak should be chosen ____

Back 2

for the type and amount of contrast desired

Front 3

the k-edge of phosphor imaging plates ranges from ____ keV

Back 3

30 to 50

Front 4

the range of kilovoltage peak that can be used with CR is ____ KVp

Back 4

45 to 120

Front 5

True or False: less kilovoltage peak is needed with conventional radiographic screens than is necessary for CR systems

Back 5

False

Front 6

mas is selected for the _____

Back 6

number of electrons needed

Front 7

when insufficient light is produced by the imaging plate phosphor, the image will _____

Back 7

be grainy

Front 8

quantum mottle is caused by ____

Back 8

insufficient light

Front 9

True or False: backscatter from the cassette-detector influences the amount of mAs necessary to produce the image

Back 9

True

Front 10

using an imaging plate that is much larger than the part being examined will ______ resolution

Back 10

decrease

Front 11

True or False: using the wrong imaging plate size may result in a matrix with very small pixels

Back 11

False

Front 12

the higher the number of pixels in a matrix, the _______ the image resolution

Back 12

higher

Front 13

true or False: grid lines projected onto the imaging plate will not interfere with the image

Back 13

False

Front 14

the moire artifact results when grid lines and scanning lasers are ______

Back 14

parallel

Front 15

Grid use for CR examinations is more critical than in film/screen radiography because CR _____

Back 15

imaging plates record more densities

Front 16

the number of grid lines per centimeter or lines per inch describes grid ____

Back 16

frequency

Front 17

Grid ratio describes the ____

Back 17

relationship between the height of the lead strips to the interspace

Front 18

which of the following requires more critical beam centering?
-parallel grids
-focused grids
-low-ration grids
-low-frequency girds

Back 18

focused grids

Front 19

collimation to a smaller area _____

Back 19

decreases compton interactions

Front 20

true or False: it is acceptable to replace collimation with shuttering

Back 20

false

Front 21

True or False: images should be marked only with computerized markers

Back 21

False

Front 22

the exposure indicator number for Fuji systems is the ____ number

Back 22

S

Front 23

the exposure indicator number is an _____

Back 23

indication of radiation absorbed by the imaging plate

Front 24

true or False: with Fuji exposure indicators, the lower the S number, the higher the exposure

Back 24

true

Front 25

What manufacturer uses exposure indicator numbers in the thousands?

Back 25

Kodak

Front 26

As kodak exposure indicator numbers increase by 300, exposure

Back 26

increases by a factor of 2

Front 27

an S number of 400 in a Fuji system ____ an S number of 2000

Back 27

is half the exposure of

Front 28

in a Fuji system, each change of exposure number of 200 is equal to a change by a factor of ___

Back 28

2

Front 29

in a ll systems, exposures outside the range indicate ____

Back 29

both overexposure and underexposure

Front 30

a histogram is____

Back 30

a graphic representation of x-ray exposure

Front 31

dark line artifacts can be caused by ____

Back 31

scatter through the back of the cassette

Front 32

horizontal white lines may be caused by ____

Back 32

dirt on the light guide in the reader

Front 33

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

Back 33

perpendicular

Front 34

fine white lines appearing on a hard copy of the image may be caused by _____

Back 34

debris on the mirror in the laser printer