physics

Question 1

negative charge part of the x ray that generates / produced e-‘s

Answer 1

cathodes

Question 2

the filament is made of __

Answer 2

tungsten

Question 3

___: produces a clound of e-s when heated called termionic emission

Answer 3

filament

1 lg. and 1 sm.

lg: used for lg target, shorter exposure time, less sharp/ detail
sm: used for sm target, longer exposure time

Question 4

____: focuses the stream of e-s towards the anode

Answer 4

focusing cup

Question 5

function of the anode

Answer 5

positively charged

the anode rotates to increase the target area which allows the heat to dissipate

Question 6

___: removed low NRG, long wavelengths before they fit the patient

Answer 6

filtration

Question 7

what material is the filtration made of ?

Answer 7

aluminum

Question 8

what part of the x ray increases the qaulity of the image by taking out the long non-penetrating x rays

(and decreases patient dose)

Answer 8

filtration

Question 9

which part of the x ray machine decreases scatter radiation?

Answer 9

collimation

filtration does not decrease scatter radiation, but it does decrease the patients dose

Question 10

___: limits the beam size

Answer 10

collimation

Question 11

location of the GRID

Answer 11

in the bucky

Question 12

what is the GRID made of?

Answer 12

lead or aluminum strips

Question 13

___: absorbs scatter beams, decreases film fog

Answer 13

GRID

Question 14

___ : will incr patient dosage, but increases the film contrast (makes it sharper)

Answer 14

GRID

Question 15

_____ratio: ht. of the lead strips to the distance btw the strips

Answer 15

GRID ratio

Question 16

small crystals vs. lg crystals

Answer 16

small: (better film)
* produce less light
* see more detail
* more patient exposure

large crystals:

• produce more light
• less detail
• less patient exposure

Question 17

Anode heel effect can be diminished as th __ and ___ increases

Answer 17

FFD and KVP

Question 18

when there is an anode heel effect the intensity of the x ray is higher at the __ side

Answer 18

cathode

Question 19

the ___ side is used for thinner body parts because there is x rays and smaller focal spots

Answer 19

anode side

Question 20

what side of the x ray has a larger effective focal spot on the x ray?
- used for thicker body parts

Answer 20

cathode side

Question 21

___: changes the e- current from AC to DC

Answer 21

rectification

Question 22

___: stream of e- are narrowed down to the effective beam

Answer 22

line focusing

Question 23

a (greater/ smaller) Focal film distance will decrease magnification and distortion?

Answer 23

greater

Question 24

a (greater/ smaller) object film distance will increase magnification and distortion

Answer 24

greater

for a clear pic want: greater FFD and a smaller OFD

Question 25

___: border area around the image that is not shot and only partially illuminated

Answer 25

penumbra

increase penumbra: lg focal spot, less sharp, dear FFD, incr OFD

decrease penumbra: small focal spot, more sharp, incr FFD, decr OFD

Question 26

____: distance btw body part and the film. Causes scatter radiation to diverge away from the film (no grid needed)

Answer 26

air gap technique

reduces patient dose but distorts magnification of the image

Question 27

___ is the degree of blackness on the film,

Answer 27

density

Question 28

___: is the amt of xrays put out

Answer 28

MAS

- the degree of blackness
more xrays more exposure, more blackness

Question 29

how is a high contrast image obtained?

Answer 29

with low KVP

Question 30

how is a low contraast obtained?

Answer 30

high KVP