Prelim | IP

Question 1

CR cxt composition

Answer 1

durable light weight plastic material backed by thin Al that absorbs xr

Question 2

Instead of IS inside, there is antistatic material that protects against (1), (2), and (3)

Answer 2

1. electricity build up
2. dust collection
3. mechanical damage to plate

Question 3

IP layers

Answer 3

1. Protective layer
2. Phosphor/ active layer
3. Reflective layer
4. Conductive layer
5. Color layer
6. Support layer
7. Backing layer

PPR CC SB

Question 4

Very thin, tough, clear plastic that protects phosphor layer

Answer 4

Protective layer

Question 5

Must be constructed so that it provides durability during multiple use

Answer 5

Protective layer

Question 6

Clear plastic to allow xrs to pass through and allow light from the laser and stimulated light to pass through

Answer 6

Protective layer

Question 7

Phosphor layer is usually made of phosphor from BaFr family. Examples are

Answer 7

barium fluorohalide
chlorohalide
bromohalide crystals

Question 8

The phosphor is mixed with a/n (1) abf coated unto the (2)

Answer 8

1. organic binder
2. suport layer

Question 9

Example of an organic binder

Answer 9

Polymer, such as polyester

Question 10

This layer may be black to reduce the spread of stimulating light

Answer 10

Reflective layer

Question 11

IP layer that sends light in a forward direction and some detail is lost in this process

Answer 11

Reflective layer

Question 12

Layer of material that absorbs and reduces static electricity that may degrade image quality

Answer 12

Conductive/ Anti-static Layer

Question 13

Color layer absorbs (1) and reflects (2)

Answer 13

1. stimulating light
2. emitted light

Question 14

Newer plates may contain a color layer located bn the (1) and the (2)

Answer 14

1. active/ phosphor layer
2. support

Question 15

Semi-sigid material that gives the imaging some strength

Answer 15

Support layer

Question 16

Example of support layer

Answer 16

Polyester base

Question 17

Backing layer is a — that protects the back of the CXT

Answer 17

soft polymer

Question 18

Backing layer is usually made of (1) to stop (2)

Answer 18

1. lead
2. backscatter

Question 19

Where some barcode is placed for pt identification

Answer 19

Backing layer

Question 20

GOOD CHARACTERISTICS OF PHOSPHOR

Answer 20

1. Should have good x-ray absorption efficiency
2. Capable of being stimulated by Helium-neon laser
3. Luminescence of light must be compatible with PMT
4. Luminescence must be shorter than 1usec (microsec) to prevent screen lag
5. Phosphor should be able to store the latent image for couple of hours without compromising the signal from the IP

A He LL Store

Question 21

2 TYPES OF IP

Answer 21

1. STANDARD RESOLUTION IP
2. HIGH RESOLUTION IP

Question 22

STANDARD RESOLUTION vs HIGH RESOLUTION IP

Answer 22

STANDARD RESOLUTION
- thicker phosphor layer = higher absorption
- lower image quality
- fast screen speed

HIGH RESOLUTION
- thinner phosphor
- high image quality (sharper image)
- slow screed speed

Question 23

Scatter radiation and image quality relationship

Answer 23

Directly proportional (more scatter = higher quality)

Question 24

Difference of how low and high img quality is produced

Answer 24

If absorbed = low image quality
If penetrated = high image quality

Question 25

Relationship of ideal exposure factor

Answer 25

high kVp, low mAs

Question 26

Latent Image Formation

(1) created a latent image, and (2) produces PSL. The (3) is used to create the CR image

Answer 26

1. X-ray exposure of the PSP- IP
2. laser scanning of the exposed IP
3. information from the PSL

Question 27

Explain KEY POINT: DOPING OF PSP

Answer 27

PSP plate is coated with Europium-activated BaFl crystals
↓
Doping of Europium creates defects in the BaFBr/I crystals, that allow electrons to be trapped more efficiently

Question 28

DOPING BARIUM FLUOROHALIDE WITH EUROPIUM

When pure crystals of Barium Fluorohalide are doped with small amount of Europium, crystals develop a tiny defect called (1)

F-centers act like (2) in the crystals that can trap electrons

Answer 28

1. metastable sites of F-center
2. electronic holes

Question 29

F center in German

Answer 29

(German: Farbzentren/ color center)