Reverse chapter 15

Question 1

2 shades; black and white High Contrast

Answer 1

Bistable

Question 2

Multiple levels of gray Low Contrast

Answer 2

Gray Scale

Question 3

“real world” numbers unlimited # of choices continuous values

Answer 3

Analog

Question 4

“computer” numbers limited choices discrete values

Answer 4

Digital

Question 5

determines the range of brilliance within the displayed image

Answer 5

Contrast

Question 6

determines the range of the displayed image

Answer 6

Brightness

Question 7

translates the information from the spoke format into the video format

Answer 7

Scan convertor

Question 8

image detail

Answer 8

Spatial resolution

Question 9

image fade image flicker instability deterioration

Answer 9

Disadvantages of analog scan convertors

Question 10

Uniformity Stability Durability Speed Accuracy

Answer 10

Advantages of digital scan convertors

Question 11

smallest building block of a digital picture

Answer 11

Pixel

Question 12

Number of picture elements per inch

Answer 12

Pixel Density

Question 13

few pixels per inch larger pixels less detailed image lower spatial resolution

Answer 13

Low Pixel Density pixels per inch size of pixels detail of image spatial resolution

Question 14

many pixels per inch smaller pixels more detailed image higher spatial resolution

Answer 14

High Pixel Density pixels per inch size of pixels detail of image spatial resolution

Question 15

smallest amount of computer memory

Answer 15

Bit

Question 16

group of eight bits of computer memory

Answer 16

Byte

Question 17

computer memory consists of two bytes or 16 bits

Answer 17

Word

Question 18

gray shades

Answer 18

Contrast Resolution

Question 19

fewer shades of gray degraded contrast resolution

Answer 19

Fewer Bits per Pixel shades of gray contrast resolution

Question 20

more shades of gray improved contrast resolution

Answer 20

More Bits per Pixel shades of gray contrast resolution

Question 21

2^ number of bits

Answer 21

Calculating the shades of gray

Question 22

image element image detail spatial resolution

Answer 22

Pixels vs Bits Pixel

Question 23

computer memory gray shades contrast resolution

Answer 23

Pixels vs Bits Bits

Question 24

Analog -> analog to digital converter -> Digital memory -> digital to analog converter -> Analog

Answer 24

Analog to digital converter

Question 25

manipulating before storage in the scan convertor TGC log Compression write magnification persistence spatial compounding edge enhancement fill-in interpolation

Answer 25

Preprocessing

Question 26

manipulating after storage in the scan convertor any change after freeze frame black/white inversion read magnification contrast variation 3-D rendering

Answer 26

Postprocessing

Question 27

uses old data postprocessing larger pixel size same # of pixels as in the original ROI unchanged spatial resolution unchanged temporal resolution

Answer 27

Read Magnification

Question 28

acquires new data preprocessing identical pixel size more pixels that in the original ROI improves spatial resolution may improves temporal resolution

Answer 28

Write Magnification

Question 29

method of improving image quality

Answer 29

Coded Excitation

Question 30

higher signal to noise ratio improved axial resolution improved spatial resolution improved contrast resolution deeper penetration

Answer 30

Advantages of Coded Excitation

Question 31

reduces shadowing

Answer 31

Spatial Compounding

Question 32

reduce speckle and noise artifact

Answer 32

Frequency Compounding

Question 33

makes image look sharper

Answer 33

Edge Enhancement

Question 34

makes image smoother "super impose"

Answer 34

Temporal Compounding or Persistence

Question 35

predicts what information lies between the gaps and improves spatial resolution

Answer 35

Fill-in Interpolation

Question 36

measure how dense something is and have mechanical properties

Answer 36

Elastography

Question 37

Picture Archiving and Communications System Stored digitally

Answer 37

PACS

Question 38

Digital Imaging and Computers in Medicine set of rules, or protocols, that allows imaging system to share info on a network

Answer 38

DICOM

Question 39

charts from pen writers

Answer 39

Recording and Archiving Techniques: Paper Media Examples

Question 40

portability does not require a device to read

Answer 40

Recording and Archiving Techniques: Paper Media Advantages

Question 41

bulky, hard to store difficult to make copies cant display dynamic images

Answer 41

Recording and Archiving Techniques: Paper Media Disadvantages

Question 42

computer discs computer memory magnetic tape video tape

Answer 42

Recording and Archiving Techniques: Magnetic Media Examples

Question 43

able to store large amounts of info efficiently can store and play dynamic can record color

Answer 43

Recording and Archiving Techniques: Magnetic Media Advantages

Question 44

can be erased by strong magnetic fields

Answer 44

Recording and Archiving Techniques: Magnetic Media Disadvantages

Question 45

photographs flat films multiformat camera film

Answer 45

Recording and Archiving Techniques: Chemically Mediated Photographs Examples

Question 46

High resolution accepted in the medical community can produce color images

Answer 46

Recording and Archiving Techniques: Chemically Mediated Photographs Advantages

Question 47

bulky, difficult to store and retrieve requires chemical processing artifacts can arise from dirt pr chemical contamination

Answer 47

Recording and Archiving Techniques: Chemically Mediated Photographs Disadvantages

Question 48

laser discs compact discs

Answer 48

Recording and Archiving Techniques: Optical Media Examples

Question 49

store huge amounts of data inexpensive not erased by exposure to magnetic field

Answer 49

Recording and Archiving Techniques: Optical Media Advantages

Question 50

requires a display system no standardized format for image display and storage

Answer 50

Recording and Archiving Techniques: Optical Media Disadvantages