mobile & fluoro

Question 1

how far should you stand from the portable?

Answer 1

6 feet away (6ft cord w deadman switch)

Question 2

the most popular type of portable

Answer 2

battery operated

Question 3

what type of grid would you use for portables

Answer 3

lower grid ratio - 6:1 - 8:1

Question 4

who invented fluoroscopy & when ?

Answer 4

thomas edison in 1896

Question 5

dynamic imaging is

Answer 5

live imaging

Question 6

designed to convert remnant radiation from the patient to an amplified light image

Answer 6

image intensification tube

Question 7

fluoro x ray tubes use what type of mA ?

Answer 7

lower mA - 0.5-5 mA
(diagnostic is 50-1200)

Question 8

what is the fixed tube target in fluoro x ray tubes

Answer 8

15” , used to prevent SOD (source to object)

Question 9

emission of light is called

Answer 9

photoemission

Question 10

the output screen absorbs the ________ & emits ______ ________

Answer 10

electrons , light photons

Question 11

what is the active layer in the input screen

Answer 11

sodium activated cesium iodide

Question 12

csl absorbs _____ of incident beam

Answer 12

66%

Question 13

series of charged electrons in the glass envelop of the tube

Answer 13

electrostatic lenses

Question 14

what reverses the image from the input screen image

Answer 14

focal point

Question 15

the active layer in the output screen

Answer 15

sliver activated zinc cadmium sulfide phosphor

Question 16

the measurement of the increases in image intensity achieved by an image intensification tube

Answer 16

total brightness gain

Question 17

minification formula

Answer 17

minification gain = input screen diameter^2 / output screen diameter ^2

Question 18

brightness gain formula

Answer 18

brightness gain = minification gain x flux gain

Question 19

does flux gain increase or decrease image quality

Answer 19

causes a decrease

Question 20

unit of luminous intensity

Answer 20

candelas

Question 21

the measurement of the increase in light photons due to the conversion efficiency of the output screen

Answer 21

flux gain

Question 22

automatically adjust exposure factor according to

Answer 22

pt density

Question 23

what is apart of the video camera system, has fast response time, does not change exposure factors & works with an electronic signal

Answer 23

AGC - automatic gain control

Question 24

warps the appearance of the image formed

Answer 24

pinchushion

Question 25

what all is contrast affected by

Answer 25

scatter , penumbras light scatter, light scatter within tube

Question 26

what is digital fluoro made up of that contacts the image intensifier output anode screen

Answer 26

TFT - thin film transistor

Question 27

combining pixels to reduce noise (better detail)

Answer 27

pixel binning

Question 28

advantages of digital fluoro include

Answer 28

high contrast , low dose, exam speed reduced

Question 29

distance from the center of one pixel to the center of the next one in the display

Answer 29

pixel pitch

Question 30

8 bit processing =

Answer 30

256 shades of gray

Question 31

table top exposure should not exceed

Answer 31

10 R/ min

Question 32

minimum SSD from mobile

Answer 32

12”

Question 33

minimum SSD for stationary

Answer 33

15”

Question 34

mag mode _______ pt dose

Answer 34

increases

Question 35

lead apron & gloves should be at least ____Pb/eq

Answer 35

0.5mm

Question 36

highest energy is at ____ degrees to the beam

Answer 36

90

Question 37

lead shield on bucky slot cover & lead curtain should be at least ____ Pb/eq

Answer 37

0.25mm

Question 38

name the 5 parts of the intensifier

Answer 38

input phosphor photo cathode electrostatic lens accelerating anode output phosphor

Question 39

what is the emission of light from the photocathode called

Answer 39

absorption of light & emission of electrons

Question 40

how does magnification of the image occur ?

Answer 40

change in voltage to lenses - changes focal spot

Question 41

describe conversion efficiency

Answer 41

how well or how poorly the light conversion is at the output screen (light photons)

Question 42

what kV is the anode inside the intensification tube supplied with

Answer 42

25 kV

Question 43

what can be done to decrease quantum mottle

Answer 43

increase tube mA

Question 44

battery powered portable units have a generator equal to what type of generator output

Answer 44

high frequency generators