mAs + keVs of studies

Question 1

regular diagnostic XR (range of parameters)

Answer 1

mA 200-800

kVp 50-120

Question 2

fluoro

Answer 2

mA 0-5

kVp 50-120

Question 3

focal spot general XR

Answer 3

1.0 -1.2 mm

Question 4

focal spot IR

Answer 4

0.3 -0.6 mm

Question 5

chest XR :

kVp,

mAs,

grid

thickness of body part

Answer 5

kVp 120

mAs 5

yes grid

21 cm

Question 6

foot XR :

kVp,

mAs,

grid

thickness of body part

Answer 6

kVp 60

mAs 2

NO grid

9 cm

Question 7

abdominal XR :

kVp,

mAs,

grid

thickness of body part

Answer 7

kVp 80

mAs 20

yes grid

20 cm

Question 8

CT:

mA

kVp

Answer 8

mA is super HIGH up to 1000

kvp 80-120

Question 9

CT focal spot

Answer 9

0.6-1.2 mm

Question 10

In fluoro, best kVp to use with IV contrast?

Answer 10

60-80 kVp

Question 11

fluoro Air kerma limit (the one for obese people)

Answer 11

176 mGy/min (20R/min)

Question 12

fluoro Air kerma limit (the normal one)

Answer 12

87 mGy/min (10R/min)

Question 13

target/filter combo for HUGE breasts

Answer 13

Rh/rh

Mo/Al (dense breasts)

W/Ag

Question 14

target filter combo for “intermediate” densities breasts

Answer 14

Mo/Rh

Question 15

Mammo:

kVp

mA

Answer 15

kVp 25-35 (low Energy)

mA 100 (low tube current)

low-low

Question 16

mammo tube window

Answer 16

Beryllium

Question 17

general radiography tube window

Answer 17

pyrex glass

Question 18

Receptor Air Kerma for mammo vs General Radiology

Answer 18

mammo Air Kerma 100uGy

gen XR Air Kerma 5uGy

Question 19

mammo grid ratio

Answer 19

5:1

Question 20

Gen radiology grid ratio

Answer 20

10-1

Question 21

grids are used above what thickness of tissue

Answer 21

10 cm

Question 22

contact mammo focal spot size

Answer 22

0.3 mm

Question 23

magnification mammo focal spot size

Answer 23

0.1 mm

Question 24

mA for magnification mammo

Answer 24

25 mA

have to drop mA from 100 to 25 due to heat loading from focal size of 0.1mm. Also…have to increase exposure time from 1s to 3 s.

Question 25

digital display pixels for general Xray

Answer 25

3 Mega pixels

Question 26

digital display pixels for mammo

Answer 26

5 Mega pixels

Question 27

Spatial resolution (lp/mm)

Screen film mammo

Answer 27

15 lp/mm

Question 28

spatial resolution (lp/mm)

Digital mammo

Answer 28

7 lp/mm

Question 29

spatial resolution (lp/mm)

digital radiograph

Answer 29

3 lp/mm

Question 30

CT lp/mm

Answer 30

0.7 lp/mm

Question 31

MRI lp/mm

Answer 31

0.3 lp/mm

Question 32

Bucky factor for general radiography

Answer 32

4-8 depending on grid ratio

Question 33

bucky factor for mammo

Answer 33

2

(grid ratio 4:1)

Question 34

kVp in a pediatric CT

Answer 34

`70 kVp

do kVp modulation in kids