Fluoro Review

Question 1

what is the mA range in fluoro

Answer 1

0.5-5mA

Question 2

how long is the backup timer

Answer 2

5 minutes

Question 3

define image intensification

Answer 3

exit radiation from the anatomic structure interacts with the input phosphor for conversion into light

Question 4

input phosphor

Answer 4

exit radiation to visible light

Question 5

photocathode

Answer 5

visible light to electrons

Question 6

electrostatic focusing lenses

Answer 6

accelerates electrons toward an anode to strike the output phosphor

Question 7

output phosphor

Answer 7

converts electrons to visible light

Question 8

true or false; the greater the conversion factor or brightness gain, the greater the efficiency of the image intensifier

Answer 8

true

Question 9

ABC

Answer 9

automatic brightness control

Question 10

what does ABC do

Answer 10

maintains the overall appearance the image; adjusting the kVp, mA, or both

Question 11

true or false; fluoro is considered a static form of imaging. Allowing for the imaging of movement of internal structures

Answer 11

false; it is considered dynamic imaging. it uses live x rays captured in video form

Question 12

true or false; using a low mA setting allows for longer exposure times in fluoro

Answer 12

true

Question 13

what kinds of material is the input phosphor made of

Answer 13

cesium iodide

Question 14

outline the steps of image production in fluoro

Answer 14

x-rays -> input phosphor; turns into light -> photocathode; light into e- -> electrostatic focusing lenses -> anode -> output phosphor; e- into light; intensity of the image/ increased brightness

Question 15

what material is the output phosphor made of

Answer 15

zinc cadmium sulfide

Question 16

what material is the photocathode made of

Answer 16

cesium and antimony

Question 17

define flux gain

Answer 17

accelerating the e- to increase the light intensity at the output phosphor

Question 18

deine magnification gain

Answer 18

the reception in the see of the output phosphor image compared with the input phosphor image; results in an increased light intensity

Question 19

name the term for the following definition: a product of both flux gain and magnification gain; results in a brighter image on the output phosphor

Answer 19

brightness gain

Question 20

when is a brighter image created

Answer 20

when accelerated e- strike a smaller output phosphor

Question 21

with a high conversion factor/brightness gain; it can be said that the II has a _____ efficiency level

Answer 21

high

Question 22

conversion factor = ___% of brightness gain

Answer 22

1

Question 23

define conversion factor

Answer 23

the luminance at the output phosphor divided by the input exposure rate

Question 24

what is the unit to measure for the conversion factor

Answer 24

candela per square meter per milliroentgen per second

Question 25

example: a brightness gain of 20,000 would have a conversion factor of ____

Answer 25

200

Question 26

true or false; ABC can be slow to adjust due to pt thickness and density

Answer 26

true

Question 27

what is another term for magnification mode

Answer 27

multi-field mode

Question 28

when using mag mode the voltage to the electrostatic focusing lenses is _____

Answer 28

increased

Question 29

what are the three trifocus lenses

Answer 29

30cm, 23cm, 15cm

Question 30

how do you find the degree of magnification

Answer 30

dividing the full-size input diameter by the selected input diameter

Question 31

true or false mag mode increases pt dose

Answer 31

true

Question 32

how does mag mode effect spatial resolution

Answer 32

it increases spatial resolution

Question 33

what is the spatial resolution capacity in fluoro

Answer 33

4-6 line pairs/mm

Question 34

define vignetting

Answer 34

loss of brightness around the edges of the image

Question 35

what causes a pincushion effect to an image

Answer 35

uneven magnification

Question 36

what causes a grainy/noisy image

Answer 36

too low mA