Numbers

Question 1

What is the optimal target-to-film distance in radiography?

Answer 1

40 inches

Question 2

What is the minimum thickness of lead equivalent required for aprons or drapes?

Answer 2

0.25mm of LEAD

Question 3

What is the optimal target-to-panel distance?

Answer 3

18 inches

Question 4

What is the optimal thickness for a bucky slot?

Answer 4

0.25mm of lead

Question 5

What is the normal binocular viewing distance?

Answer 5

12-15 inches

Question 6

What is the minimum thickness for gonadal shielding?

Answer 6

0.5mm of lead

Question 7

How far away should the operator stand?

Answer 7

6 feet away

Question 8

What is the total equivalency minimum for total filtration?

Answer 8

2.5mm ALUMINUM

Question 9

What is the minimum thickness for shielding of fetuses (in pregnant patients)?

Answer 9

0.5mm lead

Question 10

What is the target-to-tabletop distance?

Answer 10

12 inches

Question 11

How many inches of water is the phantom equivalent?

Answer 11

9 inches

Question 12

How many rads of exposure during 5 min. of fluoroscopy?

Answer 12

10-30 rads

Question 13

How many rads of exposure during 35mm CINE exam?

Answer 13

10-20 rads/min

Question 14

How much exposure is obtained from 2 min upper GI series fluoro?

Answer 14

6 rads to the PATIENTA

Question 15

What is the unit of absorbed dose?

Answer 15

rads = roentgen or Gy (1 gray= 100 rads)

Question 16

How many mR/hour when person standing 3ft from fluoroscopy?

Answer 16

50mR/hour

Question 17

How many rads to a female ovary can induce temporary sterility?

Answer 17

300 rads

Question 18

How many rads to a man can induce temporary sterility?

Answer 18

30 rads

Question 19

How many rads to the fetus can result in spontaneous abortion?

Answer 19

50 rads

Question 20

How many rads to an embryo can cause deleterious effects?

Answer 20

as little as 10 rads

Question 21

How many rads of exposure cause cataracts?

Answer 21

several hundred rads

Question 22

What is the gonad dose during a barium enema?

Answer 22

0.5 rads

Question 23

What is the patient’s skin exposure of AP abdomen?

Answer 23

0.5 rads

Question 24

What is the patient’s exposure for a cardiac cath bone marrow dose?

Answer 24

0.19 rad

Question 25

What is the standard range for fluoroscopy radiation?

Answer 25

<5 rads/min

Question 26

What is the patient’s skin exposure for a single PA of the chest?

Answer 26

25mr

Question 27

What is the max leakage for diagnostic xray tube?

Answer 27

100 mr/hr

Question 28

What is the dose for for each mA when tube is at 80 kVp

Answer 28

2.2 rads/min

Question 29

What is the max for embryo/fetal dose during entire pregnancy?

Answer 29

0.5 rem

Question 30

0.25 mm lead apron leads to what % in dose reduction?

Answer 30

97%

Question 31

0.5 mm lead apron leads to what % in dose reduction?

Answer 31

99%

Question 32

0.5 mm lead GONADAL shielding reduced gonad dose by what %?

Answer 32

92%

Question 33

What percentage of dose reduction is obtained when utilizing video disc recording during fluoroscopy?

Answer 33

95% dose reduction

Question 34

what % of incident photons exit the patient’s body as remnant radiation?

Answer 34

5%

Question 35

How many degrees from primary beam has the most scatter?

Answer 35

135 degrees

Question 36

How many seconds does it take for fluoro table to move from horizontal to vertical?

Answer 36

10-20 seconds

Question 37

What is the integration time (recognition of image)?

Answer 37

0.2 sec

Question 38

1 field of imagery has how many horizontal lines?

Answer 38

525 horizontal lines on a TV monitor