practice test-final

Question 1

How many bits are in 1 byte?

Answer 1

8

Question 2

convert 11101:

Answer 2

29.
from left to right:
ones twos fours eights sixteens etc

Question 3

memory that is stored anywhere on a disc and can be easily changed by user:

Answer 3

RAM

Question 4

how many pixels are in a matrix with a size of 150x100

Answer 4

15,000

Question 5

an image with a bit depth of 6 displays how many shades of grey?

Answer 5

64

Question 6

which action will increase the contrast of digital image?

Answer 6

decrease in window width

Question 7

in a histogram what is Smax?

Answer 7

the darkest pixels used for analysis

Question 8

segmentation errors occur when a CR plate is processed and the computer:

Answer 8

sees 3 individual pictures as one image.

Question 9

The range of values that a radiologist might choose when viewing bone or soft tissue?

Answer 9

VOI
Value of Intrest

Question 10

Graduation processing primarily controls:

Answer 10

Brightness

Question 11

Low-pass filtering mutes which types of objects?

Answer 11

small

Question 12

A small matrix that is used to apply effects to a small section of an image is known as a:

Answer 12

kernel

Question 13

An image is created with a speed class of 100 and results in a patient dose of 4 mSv. If the speed class is increased to 400 and the mAs is adjusted to compensate, what will the new patient dose be?

Answer 13

1

Question 14

The exposure indicator is extrapolated by finding the median-point between:

Answer 14

Smin and Smax

Question 15

A deviation index of -4 indicates that the image should be repeated due to:

Answer 15

quantum mottle

Question 16

Digital image processing can adapt to all of the following EXCEPT:

Answer 16

a Deviation index less than -3

Question 17

A digital image is considered saturated if the exposure to the plate reaches how many times greater than the expected exposure?

Answer 17

8

Question 18

CR plates retain _____ of the latent image after 8 hours

Answer 18

75%

Question 19

The only part of a DEL that can be reduced to any size is the:

Answer 19

detector surface

Question 20

Direct digital imaging systems use:

Answer 20

amorphous selenium

Question 21

This type of light emission requires restimulation:

Answer 21

stimulated phosphorescense

Question 22

When an LCD screen is in the “on” state:

Answer 22

electricity does not flow and light can pass

Question 23

The spatial resolution of an LCD monitor is often expressed in:

Answer 23

megapixels

Question 24

The warm-up time needed for an LCD monitor to reach peak brightness is at least:

Answer 24

20 minutes

Question 25

Patient billing is handled by a:

Answer 25

HIS

Question 26

A common language for medical imaging equipment to be able to share imaging data is:

Answer 26

DICOM

Question 27

A common language for hospitals to share patient data across systems is called:

Answer 27

HL7

Question 28

In order to image air/fluid levels in mobile radiography, the central ray must be:

Answer 28

PARALLEL TO THE FLOOR

Question 29

The tube-to-tabletop distance for a fixed fluoroscopic unit is:

Answer 29

38 cm AKA 15in.