Ch. 10-11 mAs, Exposure And Density/ Receptor

Question 1

As mAs increases, density _______

Answer 1

Increases

Question 2

If mA increases or s increases, mAs will ________

Answer 2

Increase

Question 3

mAs

Answer 3

Represents how many X-rays will be produced and for how long, controls density and receptor exposure, controls the total number of X-rays that leave the tube (quantity)

Question 4

As mA increases, current __________, temperature _________, and space charge _________.

Answer 4

Increases, increases, increases

Question 5

True or False: The amount of mA is directly related to the patient.

Answer 5

True

Question 6

mA controls the quantity of…..

Answer 6

Electrons flowing in the circuit and photons in the X-ray beam

Question 7

Higher mA sends more _________ from the cathode to the anode.

Answer 7

Electrons

Question 8

What’s is exposure time?

Answer 8

The duration of the X-ray

Question 9

What is phototiming?

Answer 9

Cells that can sense what mAs to use

Question 10

If milliseconds equals 40 what is seconds?

Answer 10

.04

Question 11

200 mA x .1 sec =

Answer 11

20 mAs

Question 12

mAs

Answer 12

A measure of the total quantity of electricity which flowed through the circuit during the exposure and therefore indicates the total number of X-rays used in the exposure

Question 13

True or false? As long as the product remains the same either the exposure time (s) or mA can be changed to achieve the required radio graphic exposures?

Answer 13

True

Question 14

mAs controls the _______ & _________ exposure.

Answer 14

Receptor and patient

Question 15

Film density

Answer 15

The blacks of an xray

Question 16

Window leveling

Answer 16

Describes the digital processing that produces change in density or brightness

Question 17

Desintometer

Answer 17

A device that measure the density of a radiograph

Question 18

An increase in mA, s, and mAs _________ image density and receptors exposure.

Answer 18

Increases (and vice versa)

Question 19

What is the rule of thumb when making adjustments in technique?

Answer 19

Make adjustments in increments of doubles or halves.

Question 20

A minimum of _____% will cause a visible shift in density.

Answer 20

30%

Question 21

The density produced on the film will be ________ proportional to the exposure received by the film.

Answer 21

Directly

Question 22

Failure of the reciprocity law usually means that what happened?

Answer 22

The exposure time was too short and the mA was too high or vice versa.

Question 23

The overall radiographic density and receptors exposure of an image will be __________ proportional to the mAs used.

Answer 23

Directly

Question 24

mAs formula

Answer 24

mAs = mA x s

Question 25

mA formula

Answer 25

mA = mAs \ s

Question 26

s formula

Answer 26

s = mAs / mA

Question 27

Direct square law or maintenance exposure law

Answer 27

The direct relationship between the distance of the xray source from the image receptor and the amount of radiation which will strike image receptor.

Question 28

As distance (SID) increases density decreases. What law explains this?

Answer 28

The direct square law

Question 29

The direct square law explains that if you decrease SID density will ________.

Answer 29

Increase

Question 30

Inverse square law or indirect law

Answer 30

This is the inverse relationship between distance and intensity.

Question 31

What law explains that if you decrease distance you will increase intensity?

Answer 31

The inverse square law or indirect law

Question 32

Direct square law

Answer 32

Used to maintain density for a change in distance.
Formula : (mAs1/ mAs2) = (Distance squared 1/ distance squared 2)
Cross multiply

Question 33

Use a shorter or longer exposure time and why?

Answer 33

Use the shortest exposure time possible. With a higher mA and a shorter exposure time it will give you better detail and less chance of motion.