Ch 1

Question 1

Milliamperage seconds (number of electrons and number of x-rays)
mA x time

Answer 1

mAs

Question 2

Source to image receptor (as far back as possible)

Answer 2

SID

Question 3

Object to IR distance
Always want object as close to IR as possible otherwise magnification distortion occurs (ex: shadow)
Want heart closer to IR

Answer 3

OID

Question 4

Kilovoltage peak (penetrating ability of x-rays)

Answer 4

kVp

Question 5

One thousandth of the unit to which it’s joined

Answer 5

Milli

Question 6

1/1000 ampere (1000 mA = 1 A)

Answer 6

Milliampere

Question 7

1/1000 second (1000 ms = 1 s)

Answer 7

Millisecond

Question 8

1/1000 meter (1000 mm = 1 m)

Answer 8

Millimeter

Question 9

An amount 1000 times the unit to which it’s joined

Answer 9

Kilo

Question 10

1000 volts

Answer 10

Kilovolt

Question 11

1000 grams

Answer 11

Kilogram

Question 12

Intensity of the beam is “inversely” proportional to the “square of the distance”
Intensity of the beam decreases by 4 when the distance is doubled and is increased by 4 when the distance is halved
I1/I2=D2^2/D1^2

Answer 12

Inverse square law

Question 13

Formula used when changing distances (SID)
Directly proportional
mAs1/mAs2=D1^2/D2^2

Answer 13

Exposure/density maintenance formula

Question 14

Similar triangles formula

Answer 14

b/B=h/H

Question 15

What does b in similar triangles formula represent?

Answer 15

Base of small triangle (object)

Question 16

What does B in similar triangles formula represent?

Answer 16

Base of big triangle (IR)

Question 17

What does h in similar triangles formula represent?

Answer 17

Height of small triangle (distance from object to source)

Question 18

What does H in similar triangles formula represent?

Answer 18

Height of big triangle (SID)