Medical Image Data

Question 1

A digital image is made up a two dimensional array of numbers

Answer 1

Matrix

Question 2

Matrix consist of columns (M) and rows (N) that define small square region is called?

Answer 2

Picture Element or Pixels

Question 3

Increase of number of pixel

Answer 3

Resolution: good / high quality

Question 4

Decrease number of pixels

Answer 4

Resolution: bad / low quality

Question 5

Increase size of pixel

Answer 5

Resolution: low / bad quality

Question 6

Decrease size of pixel

Answer 6

Resolution: high / good quality

Question 7

The amount of body part or patient included in the image

Answer 7

Field of View (FOV)

Question 8

The larger, more area is imaged

Answer 8

Field of View (FOV)

Question 9

Is the smallest element in a digital image

Answer 9

Pixels or picture element

Question 10

Is directly related to the amount of spatial resolution or detail in the image

Answer 10

Pixel Size

Question 11

1000 or more shades of gray, can adjust to have a good and better result

Answer 11

Digital Imaging

Question 12

It uses only 30 shades of gray.

Answer 12

Manual Processing or Conventional Xray

Question 13

The number of bits within the pixels

Answer 13

Pixel Bit Depth

Question 14

It has 10 to 16 bit depths resulting in more shades of gray

Answer 14

Pixel Bit Depth

Question 15

Refers to its appearance on the display monitor of the computer

Answer 15

Brightness

Question 16

Is a function of the monitors ability to emit light through the surface of the display

Answer 16

Brightness

Question 17

The ability of the digital system to display subtle changes in the shade of gray

Answer 17

Contrast Resolution

Question 18

The ability of the imaging system to demonstrate small details of an object

Answer 18

Spatial Resolution

Question 19

Contributes no useful diagnostic information and serves only to detract from the quality of the image

Answer 19

Quantum Noise

Question 20

Is visible as brightness or density fluctuations on the images

Answer 20

Quantum Noise

Question 21

The fewer the photons reaching the IR to form the image, the greater is the visible on the digital image

Answer 21

Quantum Noise

Question 22

Grainy or sandy-like appearance

Answer 22

Image Noise or Quantum Noise

Question 23

Ability to respond to varying levels of exposure, more tissue densities on the digital image are seen, giving the appearance of more detail.

Answer 23

Dynamic Range

Question 24

The range of exposure diagnostic image values the image detector is able to produce

Answer 24

Exposure Latitude

Question 25

Dependent on the image detector the higher dynamic range of the detector, the more values can be detected

Answer 25

Exposure Latitude

Question 26

Dependent on the image detector the higher dynamic range of the detector, the more values can be detected

Answer 26

Exposure Latitude

Question 27

Is to generate an image that is more pleasing to the observer

Answer 27

Image Enhancement

Question 28

Is to improve the quality of images that have distortions or degradation

Answer 28

Image Restoration

Question 29

Is to reduce the size of the image in order to decrease transmission time and reduce storage space

Answer 29

Image Compression

Question 30

Creates images from other images or non-image data

Answer 30

Image Synthesis

Question 31

When the frequencies of areas of interest are known, those frequencies can be amplified and other frequencies suppressed

Answer 31

Spatial Frequency Filtering EDGE ENHANCEMENT

Question 32

Edge enhancement are also know as ?

Answer 32

high-pass filtering

Question 33

Smoothing are also known as?

Answer 33

low-pass filtering

Question 34

Occurs by averaging each pixels frequency with surrounding pixel values to remove high-frequency noise

Answer 34

Spatial Frequency Filtering SMOOTHING

Question 35

The result is a reduction of noise and contrast

Answer 35

Smoothing

Question 36

The process of adding text to an image

Answer 36

Annotation

Question 37

Controls how bright or dark the screen image is

Answer 37

Window Level

Question 38

Controls the ratio of black and white or contrast

Answer 38

Window Width

Question 39

Blacken out the white collimation borders, effectively eliminating veil glare

Answer 39

Background Removal or Shutering

Question 40

The portrait, landscape, and rotation

Answer 40

Image Orientation

Question 41

Zooming in and out

Answer 41

Magnification

Question 42

Result in a black appearance of bone and a white appearance of soft tissue

Answer 42

Image Inversion

Question 43

Technique that can remove superimposed structures so that the anatomic area of interest become more visible

Answer 43

Digital Subtraction

Question 44

When anatomy or the area of interest is too large to fit on one cassette, multiple images can be "stitched" together using specialized software programs

Answer 44

Image Stitching

Question 45

One of the most commonly used three-dimensional (3D) rendering techniques

Answer 45

Multiplanar Reconstruction (MPR)

Question 46

Used to visualize vessels

Answer 46

(MIP) Maximum Intensity Projection

Question 47

Air-filled structures

Answer 47

(Minlp) Minimum Intensity Projection

Question 48

Similar to MIP but allows the user to assign colors based on the intensity of the tissue so that bone, contrast agent, and organs can be seen in different colors

Answer 48

Volume Rendering Technique (VRT)

Question 49

The Technique uses a histogram-type graph to differentiate the various structures.

Answer 49

Volume Rendering Technique (VRT)

Question 50

Using a threshold of pixel intensity values, everything below the threshold will be removed, and everything above will be assigned a color and shown as a 3D object

Answer 50

Shaded Surface Display (SSD)