3/28 Quiz

Question 1

kVp and mA determine the _________ level of the fluoroscopic image.

Answer 1

Brightness

Question 2

What is above the table in nondigital fluoroscopy?

Answer 2

Spot imaging device and image intensifier

Question 3

In nondigital fluoroscopy, the x-ray tube and IR are connected with a ____ to keep them the appropriate distance apart regardless of ________

Answer 3

C-arm
Movement of the equipment

Question 4

The X-ray tube for fluoroscopy is operated at ___ to ___ mA

Answer 4

3 to 5

Question 5

Regulation of kVp and mA for fluoroscopy depends on

Answer 5

The part being examined

Question 6

kVp and mA are automatically adjusted during fluoroscopy by a process known as

Answer 6

Automatic brightness control (ABC)
-AKA automatic brightness stabilization Or automatic gain control

Question 7

Visible image on the monitor is a result of

Answer 7

Image intensification

Question 8

The image intensifier tube converts ______ energy into _____

Answer 8

X-ray
Visible light

Question 9

Once X-ray energy is turned it visible light it is turned into an

Answer 9

Electronic signal (that is displayed on the monitor)

Question 10

Receives exit rays from the patient and converts them into visible light

Answer 10

Input phosphor

Question 11

Visible light from the input phosphor strikes the

Answer 11

Photocathode

Question 12

The photocathode releases electrons in amounts ________ proportional to the visible light striking it

Answer 12

Directly

Question 13

The electrons coming from the photocathode are concentrated and directed towards the other end of the image intensifier tube by a series of _________ and by ____ kVp applied through the tube.

Answer 13

Electrostatic lenses
25

Question 14

Once electrons reach the other end of the image intensifier, they will strike the

Answer 14

Output phosphor

Question 15

The energy of the electrons is converted by the phosphors to visible light in amounts ___ to ____ times greater than at the photocathode.

Answer 15

50 to 75

Question 16

The increase in brightness caused by acceleration of the electrons is called

Answer 16

Flux gain

Question 17

Is the output phosphor larger of smaller than the input phosphor?

Answer 17

Smaller

Question 18

the output phosphor is smaller than the input phosphor, resulting in an increase in brightness called

Answer 18

Minification gain

Question 19

The product of minification gain and flux gain is

Answer 19

Total brightness gain

Question 20

Total brightness gain ranges from ______ to ______ and decreases as the tube ages.

Answer 20

5,000 to 20,000

Question 21

_______ is possible only with dual focus or tri focus tubes, which results in increase patient dose

Answer 21

Magnification

Question 22

In Digital fluoroscopy, what is added?

Answer 22

Operating console and computer work station

Question 23

In Digital fluoroscopy, the image intensifier may be replaced by a

Answer 23

Flat panel IR

Question 24

A flat panel image intensifier provides better resolution of

Answer 24

Smaller anatomy

Question 25

In Digital fluoroscopy, the x-ray beam is _____ to keep the patient dose and heat units at a minimum

Answer 25

Pulsed

Question 26

In Digital fluoroscopy, the analog signal is sent through an ______ to convert information into numerical digital date

Answer 26

Analog-to-digital converter

Question 27

Viewing of digital fluoroscopy should take place on a

Answer 27

High resolution flat panel monitor

Question 28

An image intensifier tube consists of

Answer 28

Input phosphor Photocathode, electrostatic lenses, Output phosphor

Question 29

The input phosphor coverts x-ray energy to

Answer 29

Light energy

Question 30

Keeps electron beam narrowed as it travels toward output phosphor

Answer 30

Electrostatic lenses

Question 31

The photocathode converts light energy to

Answer 31

Electron energy

Question 32

The output phosphor converts electron energy to

Answer 32

Light energy for viewing

Question 33

The analog to digital converter enables images to be

Answer 33

Manipulate and post processed

Question 34

Mobile fluoroscopic units are usually called

Answer 34

C-arms

Question 35

Complete program in a radiology department that addresses all aspects of quality, including customer service, image interpretation, accuracy of diagnosis, and distribution of radiologist reports

Answer 35

Quality assurance

Question 36

Program that specifically addresses the safe and reliable operation of equipment

Answer 36

Quality control

Question 37

Tested using a digital dosimeter; half-valve layer measurement required

Answer 37

Filtration-beam quality

Question 38

Collimator/light field to radiation field alignment must be accurate to within ___ of the SID

Answer 38

2%

Question 39

Effective focal spot size should be within ___ of the size stated in equipment specifications

Answer 39

50%

Question 40

kVp must be accurate to within ____ of the kVp indicated

Answer 40

+/- 5%

Question 41

Timer should be within_____ of the time chosen for exposures over 10ms

Answer 41

5%

Question 42

Adjacent mA stations should be within ___ of one another

Answer 42

10%

Question 43

Radiation intensity of sequential exposures should not vary more than ____

Answer 43

5%

Question 44

AEC is tested to verify the reproductibility of exposure using _____ to simulate variations in patient thickness

Answer 44

Phantoms

Question 45

Fluoroscopy exposure rate is tested with a digital dosimeter; dose should not be more than ____ per minute

Answer 45

100 mGy

Question 46

ABC on image intensifier is checked to ensure that radiation dose hitting the _______ is constant

Answer 46

Input phosphor