Image Acquisition

Question 1

the ____ is selected according to the number of photons needed for a particular part

Answer 1

mAs

Question 2

it is when insufficient light is produced that results of the grainy image

Answer 2

quantum mottle/quantum noise

Question 3

AEC

Answer 3

automatic exposure control

Question 4

it will influence the amount of mAs necessary to create the image

Answer 4

backscatter radiation

Question 5

it must be chosen for penetration and the type and amount of contrast desired

Answer 5

kilovoltage peak (kVp)

Question 6

kVp values from range around ___ to ____

Answer 6

45 to 120

Question 7

it absorbs the scatter that exits the patient and affects latent image formation

Answer 7

grid

Question 8

it is the reduction of the area of beam that reaches the patient through the use of two pairs of lead shutters encased in a housing attached to the xray tube

Answer 8

collimation

Question 9

it results in increased contrast as a result of the reduction of scatter as fog and reduces the amount of grid cleanup necessary for increased resolution

Answer 9

collimation

Question 10

it is the post exposure image manipulation

Answer 10

shuttering

Question 11

______ ________ are displayed in tiny rows of picture elements or pixels

Answer 11

digital images

Question 12

it is the pattern that occurs because the grid lines and the scanning laser are parallel

Answer 12

moire

Question 13

moving grid also called ____

Answer 13

Bucky

Question 14

grid selection factors are:

Answer 14

frequency
ratio
focus
size

Question 15

it is the relationship between the height of the lead strips and the space between the lead strips

Answer 15

grid ratio

Question 16

the higher the ratio, the ____ scatter radiation is absorbed

Answer 16

the higher the ratio, the more scatter radiation is absorbed

Question 17

most grids chosen by radiography departments are ______ and focused

Answer 17

most grids chosen by radiography departments are parallel and focused

Question 18

it consists of lead strips angled to coincide with the diversion of the xray beam and must be used within the specific distances using a precisely centered beam

Answer 18

focused grids

Question 19

it is determined by size and layers of crystals in the film and screen

Answer 19

speed

Question 20

PSL

Answer 20

photostimulable luminescence

Question 21

it is the result when there is a production of scattered radiation during an exposure

Answer 21

fog

Question 22

it is the unwanted exposure to the image

Answer 22

fog

Question 23

______ kvp results in more scatter radiation fog

Answer 23

higher kvp results in more scatter radiation fog

Question 24

it also affects the quantity of scatter radiation

Answer 24

kilovoltage

Question 25

it is the device that measures the quantity of radiation that reaches the image receptor

Answer 25

automatic exposure control

Question 26

this principle means that even if it is a small dose, if receiving that dose has no direct benefit, you should try to avoid it

Answer 26

ALARA

Question 27

three basic measures in radiation safety:

Answer 27

time distance shielding

Question 28

QA

Answer 28

quality assurance

Question 29

it is a plan for the systematic observation and assessment of the different aspects of a project, service or facility to make certain that standards of quality are being met

Answer 29

quality assurance