chapter 27, contrast, some 20

Question 1

Two photographic factors allow detail to be seen

Answer 1

I R Exposure

Contrast

Question 2

the proper name for contrast as it is displayed on for range and brightness

a) window range
b) dynamic range

Answer 2

b

Question 3

digital processing that produce changes in contrast digital image on a monitor

Answer 3

window width

Question 4

Difference between adjacent gray shades/image receptor exposures

Answer 4

contrast

Question 5

With digital systems, the system look-up tables (L U T s) determines the

a) window width
b) dynamic range of image
c) contrast

Answer 5

b

Question 6

Few shades of gray between lightest and darkest

a) low contrast
b) high contrast

Answer 6

b. high contrast

Question 7

More shades of gray between lightest and darkest

a) low contrast
b) high contrast

Answer 7

a. low contrast

Question 8

Short/narrow dynamic range

a) high contrast
b) low contrast

Answer 8

a, high contrast

Question 9

the binary system consists of information recorded as

Answer 9

0 and 1

Question 10

0 means

Answer 10

off

Question 11

each binary number is called a

Answer 11

bit

Question 12

an 8-bit word is called a

a) bit
b) byte

Answer 12

byte

Question 13

a series of boxes laid out in rows and columns that gives forms to image

Answer 13

matrix

Question 14

the individual boxes of the matrix are known as

Answer 14

pixels

Question 15

three dimensional data point is referred to as a volume or

Answer 15

voxel

Question 16

pixel Bit depth determines these 2 factors of the system

Answer 16

density and contrast

Question 17

image file size is determine all except?

pixel size, ADC, matrix, bit depth

Answer 17

ADC

Question 18

all are normal bit size except ?

2^6, 2^12, 2^16, 2^10

Answer 18

2^6

Question 19

bit size for mammomography is which one

2^12 or 2^16

Answer 19

2^16, 65,536

Question 20

Graphical computation of signal values of data set

Answer 20

histogram

Question 21

difference between IDR and DDR is

Answer 21

direct digital Receptor use less mAs and dosage to PT

Question 22

is x-ray pixel 2 or 3 dimensional ?

Answer 22

2 dimensional

Question 23

histogram and what is used to affect the final image

Answer 23

LUT

Question 24

standard matrix size except

3000 x 3000, 2000 x 2000, 2500 x 2500

Answer 24

2000 x 2000, 2500 x 2500 are correct

no 3000 x 3000

Question 25

excessive KVP can lead to what form of histogram factor ?

Answer 25

histogram erros

Question 26

controlling factor of contrast

Answer 26

kilovoltage

Question 27

higher beam restrictions get high or low contrast?

Answer 27

higher contrast, get rid of grays

Question 28

the amount of irradiated material is dependent on

Answer 28

thickness of body part and field size.

Question 29

type of irradiated material depends on the

Answer 29

atomic number and tissue density

Question 30

influencing factors that affect contrast include?

Answer 30

Kvp, mAs, focal spot size, anode heel effect, distance, filtration, beam restriction, anatomical part, grid construction, and image receptor.