Crosswords wk 1

Question 1

Ratio of output illumination to input x-ray exposure is the

Answer 1

conversion factor

Question 2

I.I. must have ___ equivlant

Answer 2

2 mm lead

Question 3

I.I. is this type of barrier

Answer 3

Primary

Question 4

Measure of overall increase in illumination level of I.I

Answer 4

Brightness gain

Question 5

Process of e- produced from light stimulation

Answer 5

Photoemission

Question 6

Photocathode is composed of ____ & ____.

Answer 6

Cesium and antimony

Question 7

Ability to identify differences in brightness is called ____

Answer 7

Contrast perception

Question 8

Type of vision produced by rods

Answer 8

Scotopic

Question 9

Input phosphor converts x-rays to ____

Answer 9

light

Question 10

Ability to perceive fine detail

Answer 10

visual acuity

Question 11

Type of operator switch used in fluoro

Answer 11

dead man switch

Question 12

Viewing distance is optimal at ___ to ___”

Answer 12

12-15 “

Question 13

____ must be at least 3 mm of Al equivlant

Answer 13

filtration

Question 14

Phosphor made out of zinc cadmium sulfide

Answer 14

Outputphospor

Question 15

As magnification increases, pt. dose __

Answer 15

increases

Question 16

One of the most important actions an operator can take to reduce pt. dose

Answer 16

collimate

Question 17

Composition of input phosphor

Answer 17

Cesium iodide

Question 18

brightness gain can degrade up to ___ per year due to “Aging”

Answer 18

10 %

Question 19

type of vision produced by cones

Answer 19

Photopic

Question 20

Distortion resulting from concave input phosphor hitting a flat output phosphor

Answer 20

Pincushion

Question 21

What is the most common camera tube that results in good resolution/ moderate image lag

Answer 21

Vidicon

Question 22

Blurring of the image during camera movement, common in vidicon

Answer 22

Lag

Question 23

Grainy appearance due to not enough x-ray photons hitting the I.I

Answer 23

Quantum mottle

Question 24

Frames per second produced by video monitor

Answer 24

30

Question 25

Focal length divided by the diameter of the lens

Answer 25

F-number

Question 26

Beam splitting mirror allows ___ of light to go to tv camera

Answer 26

10 %

Question 27

Pattern of 525 horizontal scan line

Answer 27

raster pattern

Question 28

static high quality images obtained at over 100 mA

Answer 28

spot film

Question 29

supplies electrons in camera tube via thermionic emission

Answer 29

electron gun

Question 30

fall off of brightness at the periphery of the image

Answer 30

vegnetting

Question 31

High resolution camera with less lag, but more quntum mottle

Answer 31

Plumbicon

Question 32

Dose is 20-50 times higher than regular fluoro

Answer 32

Photospot

Question 33

Generally accepted to have a value of .7

Answer 33

Kell factor