Recording The Image

Question 0

How do the digital electrical signals work?

Answer 0

They are used to create pixels that form a visible radiographic image on the monitor

Question 1

What do digital image receptors do?

Answer 1

Convert an analog signal into a digital electrical signal

Question 2

True or false: digital image receptors may resemble and be used in the same manner as a conventional x Ray film cassette

Answer 2

True

Question 3

What are three advantages of digital image receptors over conventional x Ray film?

Answer 3

Eliminates the need of X-ray film processing
Better images that are made faster
Images can be manipulated

Question 4

Can CR systems be used for horizontal and vertical film images?

Answer 4

Yes

Question 5

What are four controllable components of the X-ray?

Answer 5

Milliamperes he
Exposeur time
Kilovolt age peak
Focal film distance

Question 6

What is milliamperage?

Answer 6

Measure of the electrical current that is used to heat the wire filament at the cathode

Question 7

The temperature of the filament is directly related to what?

Answer 7

The # of electrons that freed from their orbits to travel to the anode

Question 8

What is exposeur time?

Answer 8

Controls the period of time during which X-rays are actually produced in the X-ray tube

Question 9

What is exposeur time equivalent to?

Answer 9

The amount of X-rays produced

Question 10

What controls the number of X-rays produced?

Answer 10

mA and exposeur time

Question 11

How can you reach mA-s requirements?

Answer 11

By adjusting mA and exposeur time

Question 12

300mA x 1/60s= what?

Answer 12

5ma s

Question 13

What is kilovolt age peak?

Answer 13

Measure of electrical potential difference between the cathode and anode

Question 14

X-rays of higher energy can do what?

Answer 14

Have greater potential to penetrate through tissue

Question 15

What is the focal I’ll distance

Answer 15

The distance between the focal spot in the x Ray tube and the X-ray film

Question 16

What does the focal film distance effect?

Answer 16

The number of Rays that reach the film during a radio graphic exposure

Question 17

What is the inverse square law?

Answer 17

The intensity of the beam is reduced by 1/4th when you double the distance from the source

Question 18

The visual quality of a radiograph image is assessed by what?

Answer 18

Density
Contrast
Detail
Distortion

Question 19

What is density?

Answer 19

The degree of blackness on a film

Question 20

What does density depend on?

Answer 20

The number of X-rays reaching the film

Question 21

What will the number of X-rays do to density?

Answer 21

The more x Rays to reach the film, the greater the blackness and the greater the density

Question 22

How does mA s affect density?

Answer 22

Determines the # of x Rays produced

Question 23

How does kVp effect density?

Answer 23

Determined penetrating power of X-rays

Question 24

How does FFD effect density?

Answer 24

The farther the film from the tube the fewer X-rays that will hit which will cause lower density

Question 25

How can film processing and patient factors effect density? 4

Answer 25

Developing time Developing temperature Tissue thickness Tissue density

Question 26

What is radio graphic contrast?

Answer 26

Visible difference between two adjacent structures on a film

Question 27

What will high contrast look like?

Answer 27

Lots of Black and white little grey

Question 28

What is low contrast?

Answer 28

Lots of grey, little black and whit

Question 29

How can kVp effect contrast?

Answer 29

Variations and penetrating power can create more or fewer shades of gray

Question 30

What can effect contrast?

Answer 30

Differences in tissue thickness/density and scatter radiation

Question 31

What is radio graphic detail?

Answer 31

Image sharpness, clarity

Question 32

What are four factors that effect radio graphical detail?

Answer 32

Focal spot size, FFD, animal motion, screen film contact

Question 33

What are three ways to prevent radio graphic distortion?

Answer 33

Positioning subject as close to the cassette as possible Positioning point of interest in the center of the x ray beam Positioning subject parallel to cassette

Question 34

What is the radio graphic image lattitude?

Answer 34

The exposeur factor setting range over which radio graphic images of adequate radio graphic density will be produced

Question 35

Why does X-ray film require settings to be exact?

Answer 35

Because of its narrow lattitude

Question 36

Why do digital x Rays not need I be as exact?

Answer 36

Because digital takes x rays over a wide range of exposure settings

Question 37

Why can digital produce more shades of grey?

Answer 37

Because of its wide latitude