Formulas

Question 1

Formula for MAs

Answer 1

MAs = ma x sec(time)

Question 2

Formula for ma

Answer 2

Ma = MAs / sec

Question 3

Formula for sec

Answer 3

Sec= MAs/ ma

Question 4

Inverse square law formula

Answer 4

I1/I2= (D2)^2\ (D1)^2

Question 5

Formula for direct square law

Answer 5

MAs1/ mas2 = (D1)^2/ (D2)^2

Question 6

Kvp and beam intensity formula

Answer 6

Intensity1/Intensity 2= (kvp1)^2 / (Kvp2)^2

Question 7

15% rule formula

Answer 7

Increase Kvp by 15% = Kvp x 1.15

Decrease Kvp by 15% = Kvp x 0.85

Question 8

Formula for table top to grid conversation factor formula

Answer 8

Grid x MAs

Question 9

5:1

Answer 9

2

Question 10

6:1

Answer 10

3

Question 11

8:1

Answer 11

4

Question 12

10:1

Answer 12

4

Question 13

12:1

Answer 13

5

Question 14

16:1

Answer 14

6

Question 15

Changing one grid ratio to a different grid to determine new MAs formula

Answer 15

MAs1 / MAs 2= GCF 1/ GCF 2

Question 16

Formula for heat

Answer 16

Heat = Kvp x ma x sec X factor

Question 17

Convert ms to sec

Answer 17

Ms/ 1000

Question 18

Formula for Voltage

Answer 18

Voltage = current x resistance

Question 19

Formula for current

Answer 19

Current = voltage/ resistance

Question 20

Formula for resistance

Answer 20

Resistance = voltage/ current

Question 21

Magnification factors for MF

Answer 21

MF= Sid / sod

Question 22

Magnification factors for SOD

Answer 22

SOD = SID/ OID

Question 23

Formula for object size

Answer 23

Object size = image size / MF

Question 24

Formula for image size

Answer 24

Image size = object size x MF

Question 25

Formula for MF size

Answer 25

MF = image size / object size