Week 1

Question 1

What are the three types of x-ray?

Answer 1

Conventional, CR (Computed Radiography), DR (Digital Radiography)

Question 2

Radiography that uses intensifying screens and film

Answer 2

Conventional Film/Screen Radiography

Question 3

Another name for Computed Radiography that is used more often

Answer 3

Photostimulable Phosphor (PSP)

Question 4

Digital acquisition modality that uses storage phosphor plates to produce projection images

Answer 4

PSP (CR)

Question 5

Where are film intensifying screens primarily used?

Answer 5

Conventional Radiology

Question 6

Acquires image through use of photostimulable phosphor plate storage

Answer 6

CR - Computed Radiography

Question 7

What generally stays the same when comparing computed and conventional radiograhy?

Answer 7

Efficiency levels

Question 8

What is the active element in a phosphor plate?

Answer 8

Barium Fluorohalide

Question 9

In reference to a psp image capture to release the latent image a ___ ____ ____must be scanned over

Answer 9

Focus Laser Light

Question 10

Indirect capture is very similar to PSP systems in that the X-ray energy stimulates a ____which gives off light that is detected and turned into an electrical signal

Answer 10

Scintillator

Question 11

Converts x-ray energy directly to a digital electrical signal?

Answer 11

photoconductor

Question 12

Exposure latitude in conventional is equivalent to what in DR?

Answer 12

Dynamic range

Question 13

What is a look-up table ?

Answer 13

Maps the image gray scale values

Question 14

What are the components of PACS?

Answer 14

Reading stations, physician review stations, web access, technologist quality control, administrative stations, many interfaces to various hospital and radiology systems.

Question 15

What type of imaging would require all new equipment?

Answer 15

Digital Radiography

Question 16

T/F - Indirect capture converts absorbed energy into visible light.

Answer 16

True

Question 17

T/F - Changing matrix and FOV will not change the pixel size.

Answer 17

False

Question 18

What is each square in a matrix called?

Answer 18

picture element

Question 19

Term for Number of bits per pixel

Answer 19

Bit Depth

Question 20

What does exposure index refer to?

Answer 20

Amount of exposure received by the image receptor (not the patient)

Question 21

The difference between the actual exposure (Kind) and the Target (Ktgt) exposure

Answer 21

Deviation Index

Question 22

Ability of the digital system to display subtle changes in the shade of gray

Answer 22

contrast resolution

Question 23

Ability of the imaging system to demonstrate small details of an object

Answer 23

spatial resolution

Question 24

How efficiently a system converts x-ray input signal into useful output image

Answer 24

Detective quantum efficiency (DQE)

Question 25

T/F -Reflection of ambient light can be problematic

Answer 25

true

Question 26

Failure of the system to find the collimated edges can result in...

Answer 26

incorrect data collection, and images may be too bright or too dark

Question 27

Histogram displays the useful image by locating....

Answer 27

minimum and maximum signal within the anatomic regions of interest

Question 28

The higher the kvp, the more ___ the histogram, the lower the kvp, the more ___ the histogram

Answer 28

narrow, wider

Question 29

Result when not enough pixels in image.

Answer 29

Low resolution

Question 30

When exposure is greater or less than what is needed to produce an image, this occurs in an effort to display the pixels for the area of interest

Answer 30

Automatic Rescaling

Question 31

Images are produced regardless of this amount

Answer 31

contrast and density

Question 32

If you change the slope of a look up table this decreases/increases what?

Answer 32

contrast

Question 33

An improper algorithm application may cause image to

Answer 33

enhance contrast

Question 34

Term for Amplifications of frequencies

Answer 34

Edge Enhancement

Question 35

Suppressing frequencies that can result in the loss of detail

Answer 35

masking

Question 36

Low-pass filtering is best used for what type of anatomy images?

Answer 36

Bones

Question 37

High-pass filtering is best used for what type of anatomy images?

Answer 37

organs and tissues

Question 38

What do image level parameters control on a image?

Answer 38

brightness

Question 39

What controls the ratio of black and white, or contrast, on a image?

Answer 39

window width

Question 40

When unexposed borders around the collimation edges allow excess light to enter the eye.

Answer 40

veil glare

Question 41

Image manipulation used to blacken out the white collimated borders, effectively eliminating veil glare

Answer 41

Automatic Shuttering

Question 42

Used when anatomy or the area of interest it too large to fit on one cassette, multiple areas can be "stitched" together using specialized software programs

Answer 42

Image Stitching

Question 43

What is the shape of a histogram specific to?

Answer 43

anatomy