2015 FALL FINAL!!!!!<3 Flashcards Preview

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Flashcards in 2015 FALL FINAL!!!!!<3 Deck (86)
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1

Negatively charged electrode. Coiled wire that is a source of electrons

Cathode/Filament

2

Surrounds the cathode/filament to focus stream of electrons onto the focal track of the anode

Focusing Cup

3

2 filaments and 1 anode

dual focusing cup

4

positively charged electrode. Stationary or rotating.

Anode

5

A rotating anode can rotate at

3,000-10,000 RPM

6

This can withstand a great amount of heat and is a big makeup of the anode

Tungsten

7

1. A rotating motor consists of ______ & ______
2. And these make up a ____ motor. Speeds can change.

1. rotor and stator
2. induction

8

Moving energy

Kinetic energy

9

When electrons strike the anode, Kinetic Energy is converted to __1__ heat and __2__ energy

1. 99%
2. 1%

10

X-ray tube is made of _______ because it can withstand a great amount of heat.

pyrex glass

11

The xray tube is ______ to provide unobstructed path for electrons

vacuumed

12

The xray tube is insulated with

lead and oil

13

Leakage radiation cannot exceed

100mR/hr @ a distance of 1 meter

14

German word for braking

Brehmsstrahlung

15

Forms 85-90% of the beam. Occurs when the electrons rapidly decelerate and loop around nucleus on surface of anode.

Brehmsstrahlung

16

10-15% of the beam. Occurs when electrons on face of anode drop to fill hole in inner shells

Characteristic

17

used in fluro, positive pressure switch.

"Deadman Switch"

18

Tube current displays only during ______

exposure

19

Quantity, number, amount

controlled mAs

20

Quality, energy, penetrating ability

controlled by kV

21

least ripple 3-5% and is most efficient

High frequency transformer

22

No practical amount of __1__ can ever compensate for inadequate __2__

1. mA
2. kVp

23

Recorded detail (spatial resolution) is controlled by 3 geometric factors

1. focal spot size
2. OID
3. SID

24

projected or effective focal spot is smaller than the AFS

Blooming

25

over 100 mAs, use _____

large FS

26

The steeper the anode, the _____ the FS

smaller

27

Intensity of beam is greater on the cathode side of the tube

Anode heel effect
"FAT CAT"

28

Ways to enhance AHE (3 ways)

1. steep anode
2. large IR
3. short SID

29

Main purpose of the filtration

to decrease patients skin dose

30

If a tube operates at __1__, you must have __2__ filtration

1. 70 kVp
2. 2.5 mm Al