ch. 11 equipment design

Question 1

xray tube housing leakage must not exceed ___ mR/hr at 1 m
___ mGy/hr at 1 m

Answer 1

100 mR/hr; 0.88 mGy at 1m

Question 2

console must be (mobile/fixed) behind shielded barrier

Answer 2

fixed

Question 3

_____ and _____ are required during exposure

Answer 3

tone and x-ray sign

Question 4

what are most x-ray tables made of?

Answer 4

radiolucent carbon fiber

Question 5

SID receptor: within 2% for _________ measurements

Answer 5

distance

Question 6

SID receptor: within 1% for ___________ measurements

Answer 6

centering

Question 7

SID receptor; within _% (distance) and _% (centering) of the SID

Answer 7

2% distance, 1% centering

Question 8

distance required between collimator and patient skin for fixed units

Answer 8

15 cm

Question 9

distance required between collimator and patient skin for portable units

Answer 9

30 cm

Question 10

the brightness of a surface is termed

Answer 10

luminance

Question 11

acceptable exposure reproducibility variance

Answer 11

5%

Question 12

acceptable exposure linearity variance

Answer 12

10%

Question 13

what x-ray feature was required at one point but is no longer required on manufactured units?

Answer 13

positive beam limitation (PBL)

Question 14

Total Filtration = ___ mm (lead/aluminum) equivalent

Answer 14

2.5mm aluminum

Question 15

Consistency in output in radiation intensity for identical generator settings from one individual exposure to subsequent exposures

Answer 15

exposure reproducibility

Question 16

Consistency in output radiation intensity at selected kVp settings when generator settings are changed from one mA and time combination to another

Answer 16

exposure linearity

Question 17

acceptable exposure linearity coefficient

Answer 17

0.1

Question 18

indirect conversion image pathway (1 of 2)

Answer 18

scintillator, photodiode, thin film transistor array, electrical signals

Question 19

indirect conversion image pathway (2 of 2)

Answer 19

scintillator, charged coupled device array, electrical signals

Question 20

direct conversion image pathway

Answer 20

photoconductor, thin film transistor array, electrical signals

Question 21

converts x-ray energy into visible light

Answer 21

scintillator

Question 22

converts x-ray energy into electrical signals that are read by transistors

Answer 22

photoconductors

Question 23

primary protective barrier requires a __ mm (lead/aluminum) equivalent

Answer 23

2mm lead