Exam 1

Question 1

The fetus is most sensitive to radiation in what trimester?

Answer 1

1st

Question 2

Which unit of measure is usually used for reporting occupational exposure to radiation?

Answer 2

REM

Question 3

The focal spot size is usually set in conjunction with what?

Answer 3

High voltage circuit

Question 4

Which primary factor is responsible for the “quality” of an X-Ray beam?

Answer 4

mA

Question 5

The mA setting determines…

Answer 5

The current going through the filament

Question 6

What would have the least fluctuation in the kV level?

Answer 6

High frequency

Question 7

What propels the electrons in an X-Ray tube?

Answer 7

KV and Cathede

Question 8

A tube warm-up procedure should be performed by using how many exposures?

Answer 8

2

Question 9

Define: Thermionic emission

Answer 9

Cloud of electrons at the filament

Question 10

The purpose of ____________ is to absorb unneeded X-rays

Answer 10

Collimator shutters

Question 11

Which 3 radio graphic projections routinely uses compensating filters?

Answer 11

AP thoracic, Lateral thoracic, full spine

Question 12

What darkens a film?

Answer 12

Increased kVp, increased mA, increased time of exposure, increased beam size

Question 13

What lightens a film?

Answer 13

Increased tube distance, increased compensating filtration, decreased beam size

Question 14

Lateral film is too dark and the cervical spin is larger than x-rays you took 3 months ago. Which mistakes will you accuse the operator of?

Answer 14

Taking the film at 40 inches instead of the 72 inches you used

Question 15

What machine do you want to have

Answer 15

Dual focus tube with a tungsten target surrounded by copper with the same anode angle of 14 degrees and tungsten filaments

Question 16

The initials FFD, TFD, and SID refer to what?

Answer 16

Distance between the source of the X-Ray and the film

Question 17

What is the most commonly used dosimeter?

Answer 17

Film badge

Question 18

Imagine that you are a wee little photon that has sailed through space at a high rate of speed which has carried you into and out of a patient. Which would be the next thing you encountered?

Answer 18

Grid

Question 19

The number of electrons is controlled by…

Answer 19

Low voltage circuit

Question 20

Which effect would a smaller anode angle have compared to a large angle?

Answer 20

Would create a clearer image

Question 21

What contributes most radiation to a human’s annual exposure?

Answer 21

Radon gas

Question 22

T or F: Having the anode toward the cervicals would be the most helpful in producing a good quality A-P full spine X-Ray

Answer 22

TRUE

Question 23

In checking your collimating, what percentage is the limit of inaccuracy?

Answer 23

2%

Question 24

Which part limits the size of the useful X-Ray beam?

Answer 24

Collimator

Question 25

IU designation for the rad?

Answer 25

Gray

Question 26

"Useful beam" exits which part of the tube?

Answer 26

Window

Question 27

Filament is surrounded by...

Answer 27

The focusing cup

Question 28

What is used to tell us that the X-Ray beam is centered to the part being radiographer?

Answer 28

Light and mirror

Question 29

At a set FFD and film size the LESS COLLIMATION used the _______ the film will be

Answer 29

DARKER

Question 30

You've taken an A-P thoracic radiograph and notice that the upper part of he spine is OVEREXPOSED. What would you do?

Answer 30

Use a filter for the upper part of the film

Question 31

Federal regulation require how much filtration for an X-Ray machine that operates at 70 kV-100 kV?

Answer 31

2.5 mm

Question 32

What is used for the construction of most compensating filters?

Answer 32

Aluminum

Question 33

What allows one to move the tube stand?

Answer 33

Tube track

Question 34

10 day rule concerns:

Answer 34

Patient during a 10 day period from the onset of menses

Question 35

P-A would be better than an A-P because...

Answer 35

It will decreased breast and gonad exposure by 95%

Question 36

If you had a film that was too dark what would solve your problem?

Answer 36

Decrease mAs

Question 37

What governs the speed of electrons?

Answer 37

kV

Question 38

Main function is the removal of soft rays?

Answer 38

Tube filters

Question 39

Oil is normally found where in the tube complex?

Answer 39

Between tube and tube housing

Question 40

What is the main purpose of oil in the tube complex?

Answer 40

To cool the tube

Question 41

What is the primary controlling factor for contrast?

Answer 41

kV

Question 42

Last thing you should do before pressing the exposure button?

Answer 42

Activate the rotor

Question 43

Which type of anodes should you use?

Answer 43

Rotating

Question 44

Before moving the tube stand on the track what must be accomplished?

Answer 44

Lock must be released

Question 45

The larger or small focal spot is usually set simultaneously with the....

Answer 45

Milliamperes

Question 46

Is you wanted to increase the number of photons reaching your film you should...

Answer 46

Increase the mA

Question 47

Comparing 2 films with the kV and mAs constant, one taken at 40 inches FFD and the other at 72 inches FFD, what would occur?

Answer 47

Increased density of 40 inch film and decreased image size on 72 inch film

Question 48

Which is responsible for changing AC current to DC current?

Answer 48

Rectifier

Question 49

What stops the electrons?

Answer 49

Anode

Question 50

Low voltage circuit would produce...

Answer 50

Thermionic emission ("boiling off" of electrons)

Question 51

The _____ of the anode is responsible for the anode heel effect

Answer 51

BEVEL

Question 52

Collimator allows one to control the size of the....

Answer 52

Useful beam

Question 53

Spit screens will increase or decrease patient exposure to radiation?

Answer 53

Increase

Question 54

Where is the added filtration located?

Answer 54

On the port of the tube housing

Question 55

Which two areas are the MOST susceptible to develop a malignancy from Ionizing Radiation?

Answer 55

Bone Marrow and Breasts