Image Quality

Question 1

What are image evaluation factors

Answer 1

Contrast
Distortion
Spatial resolution
IR exposure
Gross exposure error

Quantum noise
Radiation fog
Artifacts
Markers

Question 2

What’s another word for grayscale

Answer 2

Contrast

Question 3

What is visual darkness referred to

Answer 3

Brightness

Question 4

What is low brightness

Answer 4

Black areas

Question 5

What is high brightness

Answer 5

Bones

Question 6

What is is called when there is a big difference between dark & bright areas ( hand xray)

Answer 6

High contrast
Short scale

Question 7

What is it called when there is a small difference between dark & bright areas ( ankle xray)

Answer 7

Low contrast
Long scale

Question 8

What is contrast

Answer 8

The difference between areas of brightness on an image

Question 9

What is exposure criteria

Answer 9

When brightness and contrast are in proper balance

Question 10

What are the 2 reasons grayscale is important

Answer 10

1. Still need to evaluate images for criteria
2. Knowing criteria helps to know if image is diagnostic or not

Question 11

What is distortion

Answer 11

The size and shape of anatomical structure

Question 12

What is spatial resolution

Answer 12

Sharpness of anatomical structure on the image

-looks blurry

Question 13

What is the number 1 cause of poor resolution

Answer 13

Motion

Question 14

What other factors effect spatial resolution

Answer 14

SID, OID
FOCAL SPOT
IMAGE RECEPTOR
PIXEL SIZE

Question 15

What is image receptor exposure

Answer 15

The dose received by the imaging plate

Question 16

Good image quality is based on what ?

Answer 16

The IR receiving an appropriate exposure

Question 17

How is proper IR exposure determined

Answer 17

by the exposure indicator value (deviation index) DI

Question 18

What is Gross exposure error

Answer 18

excessive IR exposure & poor image quality

Question 19

what is saturation

Answer 19

part of gross excessive IR exposure
part of image can’t be interpreted

Question 20

what is ghosting

Answer 20

IR received so much exposure that it’ll show in next image

Question 21

what is quantum noise (mottle)

Answer 21

Graininess of an image

Question 22

what causes quantum noise (mottle)

Answer 22

insufficient IR exposure
(Grainy image )

Question 23

what is radiation Fog

Answer 23

Hazy, grayness obscuring anatomy
excessive scatter due to large body part (large pt w/o grid)

Question 24

what are artifacts

Answer 24

objects or technical errors obscuring anatomy

Question 25

what identification must be on all images

Answer 25

Name, ID #, Date of exam

Question 26

Who is ultimately responsible for establishing imaging standards

Answer 26

radiologist

Question 27

Always strive for what kind of image

Answer 27

optimal image quality

Question 28

what defines an acceptable image

Answer 28

the minimum quality needed to render an accurate diagnosis

Question 29

what % of images are repeated

Answer 29

5%

Question 30

When should you repeat an image

Answer 30

when image quality doesn’t meet acceptable standards

Question 31

High image standards will

Answer 31

1. more accuracy of diagnosis
2. uphold pt trust/ we know what were doing
3. better quality images

Question 32

High imaging standards will also cause

Answer 32

1. more repeats
2. more exposure
3. more exam time
4. improve your work