Week #10 Review

Question 1

-picture element
-smallest element in a digital image

Answer 1

Pixel

Question 2

The process of associating the pixels with discrete values

Answer 2

Contrast resolution

Question 3

What is the size of the pixel directly related to the amount of?

Answer 3

Spatial resolution OR detail in the image

Question 4

Number of bits within a pixel

Answer 4

Pixel bit depth
= 2^n (n= number of bits)

Question 5

What will the gray level be a factor in determining?

Answer 5

Image contrast resolution

Question 6

What are the typical number of pixels in a matrix?

Answer 6

512 x 512
1024 x 1024
2500 x 2500

Question 7

How does pixels affect resolution?

Answer 7

Smaller pixels = more resolution
Larger pixels = less resolution

Question 8

How can the number of bits affect the shades of grey?

Answer 8

Lower bits = lower # of different shades of grey

Question 9

Display devices used for the interpretation of images by radiologists and other physicians

Answer 9

Primary electronic display devices

Question 10

Displayed devices used by general medical staff for purposes other than medical interpretation

Answer 10

Secondary electronic display devices

Question 11

What is the number of megapixels used for mammography?

Answer 11

25. Megapixels

Question 12

What is the number of megapixels used for general radiography?

Answer 12

5.2 megapixels

Question 13

What is the pixel size for a primary electronic display device?

Answer 13

Approximately 0.15mm - 0.05mm respectively

Question 14

What is the matrix range for a secondary electronic display device?

Answer 14

1.3 megapixels - 2 megapixels

Question 15

What is the pixel size for a secondary display device?

Answer 15

Approximately 0.3 mm

Question 16

Mapping of an image of one matrix size to display of another size

Answer 16

Interpolation

Question 17

The distance between the pixels on the screen

Answer 17

Pixel pitch

Question 18

Ratio of the width of the display to the height of the display

Answer 18

Aspect ratio

Question 19

What aspect ratio do primary display monitors usually have?

Answer 19

5:4
Generally 5 megapixel

Question 20

How many times each second that the monitor rewrites or updates the image on the display

Answer 20

Refresh rate

Question 21

What is the testing frequency for grid uniformity stated by SC35?

Answer 21

Annually

Question 22

What is the standard for cassette IP cleaning from SC35?

Answer 22

Monthly

Question 23

Testing evaluates the horizontal and vertical performance of the laser optics and transport systems

Answer 23

Laser Jitter test

Question 24

Slug by irregular movements and variations in laser readings

Answer 24

Jitter

Question 25

The ability to resolve different objects from the background when the difference in attenuation between the objects and the background is small compared to noise

Answer 25

Contrast resolution