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Flashcards in Review Chart 2 Deck (85)
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1

Dosimetry is used for what?

Detecting radiation

2

What is the primary factor for radiographic contrast?

kV

3

What effect would reducing the FFD have?

Number of x-rays reaching the film increases

4

What are considered the standard tube distances (SID, that is)?

40" and 72"

5

What is the purpose of the rectifiers?

Changes the current from alternating to direct

6

Which of the following is the usual tube warm-up technique?

2 exposures with the 2nd using 2 times the mAs

7

What will reduce penumbra?

Small focal spot

8

If you want to produce more x-rays, what would you do?

Increase the mA

9

A decrease in the anode angle would have what effect?

Smaller effective focal spot

10

Anode heel effect refers to what?

A reduced intensity of the x-ray beam on the anode side of the tube

11

What is the method of choice for limiting the size of an x-ray beam?

Collimator

12

Where should compensating filtration be used when taking a lateral thoracic film?

Lower thoracic spine

13

Added filtration is a term used for what?

Filtration between the collimator and patient

14

When is the safest time to x-ray a female?

10 days AFTER onset of menses

15

If a doctor inadvertently x-rayed a pregnant patient and was dumb enough to keep taking retakes until the fetus was exposed to 5 rads, what would probably be the outcome?

No effect

16

How much lead equivalency do most shielding devices have in them?

1 mm

17

What x-ray equipment experiences thermionic emission?

A filament

18

What is the main difference between ionizing and non-ionizing radiation?

Ionizing has a short wavelength and high frequency

19

How many rems are in a seivert?

100

20

What is considered a standard SID?

72"

21

Determine the outcome of a film if the tube distance is reduced from 72"FFD to 40"FFD with the mAs and kV constant?

The 40" film will be darker

22

What is the value of knowing the heat units of your unit?

To determine the proper density of the film

23

What does it mean to attenuate an x-ray beam?

Reduce the intensity

24

An accurate collimator should not allow more than what percentage of the SID of light outside of the exposure field?

2%

25

A filament is usually made of which metal?

Tungsten

26

Targets are usually made of which metal?

Copper

27

Which type of ray in the x-ray beam is the most perpendicular to the patient?

Central ray

28

What will dissipate the most heat?

Rotating anode

29

Let's say that you are considering tubes for spinal radiography...what would you tell your dealer about your desired tube?

"I want my tube to be a dual focus with a rotor."

30

What is most helpful in producing a good quality A-P full spine x-ray?

Having the anode toward the cervical