test 2 review

Question 1

in order to reduce patient exposure, what exposure factors should be considered?

Answer 1

high kVp, low mAs

Question 1

As mAs increases, the quantity of radiation reaching the IR ________

Answer 1

increases

Question 2

how much change in kVp will change the radiation exposure to the IR by a factor of 2

Answer 2

15%

Question 3

where is the radiographic grid located?

Answer 3

between the patient and the IR

Question 4

true/false: changes in kVp do not affect the exposure indicator number

Answer 4

false, they do not

Question 5

true/false: the same mAs and kVp should be used on an AP lumbar spine and a lateral spine radiograph

Answer 5

false

Question 6

a larger field size will result in _______________

Answer 6

increased scatter production

Question 7

which of the following will limit the volume of tissue irradiated?

Answer 7

cone and collimator

Question 8

what is electronic masking?

Answer 8

post processing collimation/”cropping” or “photoshopping”

Question 9

the height of the lead strips relative to the distance between them is the measure of

Answer 9

grid ratio

Question 10

which grid design is manufactured to match the divergence of the x-ray beam?

Answer 10

focused grid

Question 11

once a predetermined amount of radiation reaches the AEC detector which of the following occurs

Answer 11

exposure is stopped

Question 12

AEC determines _______; radiographer sets _____________

Answer 12

time; kVp and mA

Question 13

when using AEC, what should the technologist use to adjust subject contrast on the image

Answer 13

kVp

Question 14

a common cause for repeating images done with AEC is inaccurate

Answer 14

centering

Question 15

accurate patient measurement is most critical with a __________________

Answer 15

variable kVp, fixed mAs chart

Question 16

true/false: AEC can be used with tabletop exams

Answer 16

false

Question 17

true/false: technique charts are not needed if using AEC

Answer 17

false

Question 18

what is the relationship between mA and seconds to maintain exposure to the IR?

Answer 18

inverse proportional

Question 19

as focal spot increases, unsharpness _____________ and spatial resolution ____________; you want a ____ focal spot

Answer 19

increases, decreases, small

Question 20

increasing mAs has a _________ effect on the brightness on digital imaging

Answer 20

no

Question 21

increasing OID ______________ magnification and _________________ spatial resolution

Answer 21

increases, decreases

Question 22

which of the following factors does not affect spatial resolution?

focal spot size
SID
OID
grid

Answer 22

grid

Question 23

with exposure technique compensation, which of the following would result in a the greatest radiation exposure to the patient?

14x17 field size
air gap technique
cylinder beam restrictor
12:1 grid ratio

Answer 23

12:1 grid ratio

Question 24

off focus grid cutoff occurs by using an SID that is not _____________

Answer 24

within the focal range of the grid

Question 25

the type of motion most often used for moving grids today is _____________

Answer 25

reciprocating

Question 26

what is true for positive beam-limiting devices

Answer 26

they were once required on new radiographic installations

Question 27

when making a significant increase in collimation, ______________________

Answer 27

mAs should be increased

according to Fauber text

Question 28

AEC devices work by measuring ___________

Answer 28

radiation that exits the patient

Question 29

how many detectors are typically found in an AEC system

Answer 29

three

Question 30

minimum response time refers to ___________________

Answer 30

the shortest exposure time possible when an AEC device is used

Question 31

in AEC, adjusting the ____________ __________________ affects the exposure to the IR

Answer 31

exposure adjustment control

Question 32

what detector should be selected for a right AP shoulder when the patient is supine on the x-ray table?

Answer 32

center detector only

Question 33

when using AEC with digital imaging systems, assuming all other factors are correct, selecting the center detector on a PA chest image results in ___________

Answer 33

increases exposure in the lung area

Question 34

the ionization chamber interacts with ________________before it _____________

Answer 34

exit radiation, reaches the IR

Question 35

in a variable kVp/fixed mAs chart, ___ kVp change for every 1 cm change in part thickness

Answer 35

2 kVp

Question 36

in a fixed kVp/variable mAs chart, for every 4-5 cm, the mAs should be adjusted __________

Answer 36

by a factor of 2