Chapter 14 Fluroscopy Physics II Flashcards


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1

The overall ability of the image intensifier to make the image brighter is the

brightness gain

2

The __________ is bonded directly to the input phospher.

photocathode

3

The conversion factor is a(n) ________ term for brightness gain and is typically approximately ______ of the brightness gain value.

newer; 1%

4

When the camera tube's electron stream travels across the target, if there is light present

electrons are transmitted

5

Typical fluroscopic systems have spatial resolution capabilities in the range of

4-6 Lp/mm

6

If a 30/23/15 cm image intensifier is operated in the 23-cm mode, the fluroscopic image will be magnified by a factor of

1.3

7

This part of the image intensifier is made of cesium iodide

input phosphor

8

A face plate, signal plate, and target are all components of the

camera tube

9

Which of the following accurately shows the energy sequence during fluroscopy?

x-rays to light to electrons to light

10

The potential difference across the image intensifier is approximately

25kv

11

Distortion of the fluroscopic image that appears as unequal magnification is

pincushion appearance

12

The diameter of the output phosphor is approximately

2.5 cm

13

A disadvantage of using magnification mode during fluoroscopy is

the patient receives additional dose

14

________ imaging is accomplished with fluoroscopy as opposed to radiography

Dynamic

15

The conventional method for viewing the fluroscopic image is by

using a television monitor

16

The electrostic focusing lenses have a _______ charge

negative

17

A loss of brightness around the edge of the fluroscopic image caused by the curve of the photocathode is

vignetting

18

In reference to image intensification, the function that adjusts and maintains the overall image density and contrast during the fluroscopic procedure is

ABC

19

Increasing the mA is the way to correct a fluroscopic image that has

noise

20

The formula for minification gain is

minification gain=input phosphor diameter2/output phosphor diameter2

21

The input phosphor is ________ than the output phosphor

larger

22

Magnification of the fluorosopic image results in improved

spatial resolution

23

The commercial fluroscope was developed by

Edison

24

The ________ absorbs x-rays and emits light

input phosphor

25

________ is measured in cd/m2/mR/s

Conversion Factor

26

This part of the image intensifier is made of zinc cadmium sulfide

output phosphor

27

If the input phosphor measures 30 cm and the output phosphor measures 2.5 cm, what is the minification gain?

144

28

Before the image intensifier, the fluoroscopist may have worn ______ goggles to make it easier to see the dim fluroscopic image

red

29

The formula for brightness gain is

brightness gain= minification gain x flux gain

30

This part of the image intensifier absorbs light and produces electrons

photocathode

31

The image intensifier improved fluroscopy by

A and C (making the image brighter and indirect viewing of the image)

32

In fluoroscopy, shape distortion is caused by

the curved shape of the photocathode

33

Each capacitor in a CCD represents a(n)

pixel

34

The gain related to the decrease in size from the input to the output phosphor is the

minification gain

35

The original fluoroscopic image was very

dim

36

The _______ is located very close to the output phosphor.

accelerating anode

37

When operated in magnification mode, the electrostatic lenses have ______ of a negative charge.

more

38

The ratio of the number of light photons at the output phosphor as compared with the input phosphor is the

flux gain

39

The image intensifier was introduced in the

1950s

40

This part of the image intensifier is made of cesium and antimony compounds

photocathode

41

The formula to determine the amount of magnification created when in magnification mode, the formula is

MF= full size input phosphor/selected input phosphor

42

The image intensifier is located

inside the fluoro tower

43

When the electron beam in the camera travels back and forth across, from top to bottom, it is moving in a ______ pattern.

raster

44

The CCDs electric charge from the capacitors is sent to the

television monitor

45

Photoemission occurs at the

photocathode

46

The ________ is (are) found along the entire length of the image intensifier

electrostatic focusing lenses

47

Vidicon refers to a type of

camera tube

48

Semiconductor capacitors are components of the

CCD

49

The _______ absorbs electrons and emits light

output phosphor

50

The diameter of the input phosphor typically measures between

15-30 cm