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Xray Physics > Test 1 > Flashcards

Test 1 Flashcards

1
Q

When was the first X-ray

A

1895

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2
Q

What was the early use of X-rays

A

Dermatology, hair restoration and shoe fitting

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3
Q

What is DEXA scans good for

A

Bone density

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4
Q

How do X-rays act?

A

Like particles

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5
Q

What happen when you have more electrons

A

The higher the binding energy

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6
Q

Photon energy is directly proportional to

A

Frequency

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7
Q

Photon energy is inversely proportional to

A

Wavelength

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8
Q

What is the units for energy levels in X-rays

A

KVp

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9
Q

What is the diagnostic imaging energy level

A

50-120 KVp

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10
Q

What is SID

A

From tube to Bucky

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11
Q

What is FFD

A

Tube to Bucky

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12
Q

What is TFD

A

Tube to Bucky

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13
Q

What is SOD

A

Tube to person

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14
Q

What is OFD

A

Tube to person

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15
Q

What is OID

A

Tube to person

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16
Q

What is the inverse square law

A

The further away from the source the less light hits the person. Thus not a clear picture. The decrease is by the square root

17
Q

Inverse square law equation

A

I1/I2=d22/d12

18
Q

At 10 feet what is the proportion of the X-ray beam you get hit

A
19
Q

Change in mAs formula

A

I1/I2=d12/d22

20
Q

What does KVp control

A

Quality of the picture

21
Q

What does KVp represent

A

The force of the X-ray/penetration

22
Q

What does mAs control

A

Quantity of the beams

23
Q

What do you set first on the console

A

Set the mAS first

24
Q

What is large focal spot used for

A

Torso

25
Q

What is small focal spot

A

For extremities

26
Q

What does the rectification step do

A

Keeps current going one way by using diodes

27
Q

Three phase power is

A

3 60hz waves offset by 120 degrees

28
Q

What is the evolution of the X-ray tube

A

Crookes, Coolidge and modern/rotating

29
Q

What is the space charge effect

A

Electron cloud that is saturated with negative that prevents more electrons from joining

30
Q

What does the line focus principle say

A

Increased thermal capacity = decreased image quality

31
Q

What is the anode heel effect

A

The anode side has less radiation than the cathode side

32
Q

What’s the anode heel effect good for

A

To limit radiation exposure to thinner body parts

33
Q

How to decrease the anode heel effect

A

Compensation filter, collimating tighter, increase SID

34
Q

What side should the anode side be on

A

Anode side up

35
Q

How to warm up the tube

A

3 exposures, 10 seconds apart.
60, 70, 80 KVp
200mAs, 1 sec

Xray Physics (2 decks)

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