Chapter 11

Question 1

Primary factors of exposure

Answer 1

mAs and exposure time

Question 2

The more mAs means what

Answer 2

more exit radiation reaching image receptor

Question 3

Is mAs inversely related to exposure time

Answer 3

yes

Question 4

what alters the amount and penetrating ability of the x ray beam

Answer 4

kilovoltage

Question 5

what does focal spot size affect

Answer 5

sharpness

Question 6

are SID and radiation intensity directly related

Answer 6

no, inversely

Question 7

What does OID affect

Answer 7

radiation intensity reaching the image receptor
amount of scatter reaching the image receptor
magnification
spat res

Question 8

Magnification factor formula

Answer 8

MF=SID DIVIDED BY SOD

Question 9

SOD FORMULA

Answer 9

SID - OID

Question 10

OBJECT SIZE FORMULA

Answer 10

OBJECT SKZE = image size divided by MF

Question 11

what are grids used to increase

Answer 11

contrast

Question 12

GCF
5:1

Answer 12

2

Question 13

GCF
NO GRID

Answer 13

1

Question 14

6:1

Answer 14

3

Question 15

8:1

Answer 15

4

Question 16

12:1

Answer 16

5

Question 17

16:1

Answer 17

6

Question 18

generators with more efficient output require _____ exposure technique settings to produce an image

Answer 18

lower

Question 19

x ray tubes operated above 70 kVp are required to have a minimum of ____ mm of aluminum filtration

Answer 19

2.5

Question 20

when imaging an anatomic area that varies greatly in tissue thickness, a what can be placed in the primary beam to produce a more uniform exposure to the image receptor

Answer 20

compensating filter

Question 21

the use of compensating filters requires an increase in what to maintain the overall exposure to the image receptor

Answer 21

mAs

Question 22

accounts for approximately 50% of the adult
population and is commonly called normal or average

Answer 22

sthenic

Question 23

account for 35% of adults and refers to a more slender and taller build

Answer 23

hyposthenic

Question 24

very slender body habit is and accounts for only 10% of adults

Answer 24

asthenic

Question 25

a large stock build accounts for only 5% of adults

Answer 25

hypersthenic

Question 26

anatomic structures that have a wide range of tissue composition demonstrate

Answer 26

high subject contrast

Question 27

indicates how much size distortion or magnification is demonstrated on an image

Answer 27

MF

Question 28

device that is placed between the anatomic area of interest and the IR to absorb scatter radiation exiting the patient

Answer 28

grid

Question 29

for every change in part thickness of 4-5 cm the mas should be adjusted by a factor of

Answer 29

2

Question 30

what causes the need for adjustment of mas

Answer 30

patients age , condition, possible pathological condition

Question 31

image brightness is adjusted by the

Answer 31

computer